{"id":2727,"date":"2026-07-03T12:46:57","date_gmt":"2026-07-03T04:46:57","guid":{"rendered":"https:\/\/refvalue.org\/?p=2727"},"modified":"2026-07-03T12:53:15","modified_gmt":"2026-07-03T04:53:15","slug":"c26-reflection-practice-1-basics-and-enum-to-string","status":"publish","type":"post","link":"https:\/\/refvalue.org\/index.php\/2026\/07\/03\/c26-reflection-practice-1-basics-and-enum-to-string\/","title":{"rendered":"C++26 Reflection Practice 1: Basics and Enum-to-String"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"has-text-align-left wp-block-paragraph\">Tired of using heavy third-party libraries like <code>magic_enum<\/code> and <code>relfection-cpp<\/code> that abuse macro hacks and crush compiler template limits just to print an enum name?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">With C++26 Static Reflection (<code>P2996<\/code>), the compiler finally natively understands its own AST. Combining this with <strong>C++23 Modules<\/strong> (<code>import std;<\/code>), we can implement a compile-time, zero-runtime-overhead <code>enum_to_string<\/code> utility that compiles instantly. Here is the modern stack onboarding using GCC 16 and CMake 4.x on Arch Linux.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The Stack Setup (Arch Linux)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">As of mid-2026, combining CMake 4.x&#8217;s native module scanning with GCC 16&#8217;s reflection requires standard C++26 flags enabled alongside module support.<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro cbp-has-line-numbers\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono\" style=\"font-size:.875rem;font-family:Code-Pro-JetBrains-Mono,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;--cbp-line-number-color:#D4D4D4;--cbp-line-number-width:calc(2 * 0.6 * .875rem);line-height:1.25rem;--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:block;padding:16px 0 0 16px;margin-bottom:-1px;width:100%;text-align:left;background-color:#1E1E1E\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"54\" height=\"14\" viewBox=\"0 0 54 14\"><g fill=\"none\" fill-rule=\"evenodd\" transform=\"translate(1 1)\"><circle cx=\"6\" cy=\"6\" r=\"6\" fill=\"#FF5F56\" stroke=\"#E0443E\" stroke-width=\".5\"><\/circle><circle cx=\"26\" cy=\"6\" r=\"6\" fill=\"#FFBD2E\" stroke=\"#DEA123\" stroke-width=\".5\"><\/circle><circle cx=\"46\" cy=\"6\" r=\"6\" fill=\"#27C93F\" stroke=\"#1AAB29\" stroke-width=\".5\"><\/circle><\/g><\/svg><\/span><span role=\"button\" tabindex=\"0\" style=\"color:#D4D4D4;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>cmake_minimum_required(VERSION 4.3)\n\nset(CMAKE_EXPERIMENTAL_CXX_IMPORT_STD \"451f2fe2-a8a2-47c3-bc32-94786d8fc91b\")\n\nproject(reflection_hello)\n\nset(CMAKE_CXX_MODULE_STD ON)\nset(CMAKE_CXX_EXTENSIONS OFF)\n\nif (CMAKE_CXX_COMPILER_ID STREQUAL \"GNU\")\n    string(APPEND CMAKE_CXX_FLAGS \" -freflection\")\nendif ()<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2m-6 9l2 2 4-4\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2\"><\/path><\/svg><\/span><pre class=\"shiki dark-plus\" style=\"background-color: #1E1E1E\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #569CD6\">cmake_minimum_required<\/span><span style=\"color: #D4D4D4\">(VERSION 4.3)<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #569CD6\">set<\/span><span style=\"color: #D4D4D4\">(CMAKE_EXPERIMENTAL_CXX_IMPORT_STD <\/span><span style=\"color: #CE9178\">&quot;451f2fe2-a8a2-47c3-bc32-94786d8fc91b&quot;<\/span><span style=\"color: #D4D4D4\">)<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #569CD6\">project<\/span><span style=\"color: #D4D4D4\">(reflection_hello)<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #569CD6\">set<\/span><span style=\"color: #D4D4D4\">(CMAKE_CXX_MODULE_STD <\/span><span style=\"color: #569CD6\">ON<\/span><span style=\"color: #D4D4D4\">)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #569CD6\">set<\/span><span style=\"color: #D4D4D4\">(CMAKE_CXX_EXTENSIONS <\/span><span style=\"color: #569CD6\">OFF<\/span><span style=\"color: #D4D4D4\">)<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #569CD6\">if<\/span><span style=\"color: #D4D4D4\"> (CMAKE_CXX_COMPILER_ID <\/span><span style=\"color: #569CD6\">STREQUAL<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #CE9178\">&quot;GNU&quot;<\/span><span style=\"color: #D4D4D4\">)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #569CD6\">    string<\/span><span style=\"color: #D4D4D4\">(APPEND <\/span><span style=\"color: #9CDCFE\">CMAKE_CXX_FLAGS<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #CE9178\">&quot; -freflection&quot;<\/span><span style=\"color: #D4D4D4\">)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #569CD6\">endif<\/span><span style=\"color: #D4D4D4\"> ()<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In order to activate support for <code>import std;<\/code> in C++23 and newer targets, we need to set the CMake variable <code>CMAKE_EXPERIMENTAL_CXX_IMPORT_STD<\/code> to the value written in <a href=\"https:\/\/github.com\/Kitware\/CMake\/blob\/master\/Help\/dev\/experimental.rst\"><code>CMake\/Help\/dev\/experimental.rst<\/code><\/a>, just before the <code>project<\/code> command.<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro cbp-has-line-numbers\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono\" style=\"font-size:.875rem;font-family:Code-Pro-JetBrains-Mono,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;--cbp-line-number-color:#D4D4D4;--cbp-line-number-width:calc(2 * 0.6 * .875rem);line-height:1.25rem;--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:block;padding:16px 0 0 16px;margin-bottom:-1px;width:100%;text-align:left;background-color:#1E1E1E\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"54\" height=\"14\" viewBox=\"0 0 54 14\"><g fill=\"none\" fill-rule=\"evenodd\" transform=\"translate(1 1)\"><circle cx=\"6\" cy=\"6\" r=\"6\" fill=\"#FF5F56\" stroke=\"#E0443E\" stroke-width=\".5\"><\/circle><circle cx=\"26\" cy=\"6\" r=\"6\" fill=\"#FFBD2E\" stroke=\"#DEA123\" stroke-width=\".5\"><\/circle><circle cx=\"46\" cy=\"6\" r=\"6\" fill=\"#27C93F\" stroke=\"#1AAB29\" stroke-width=\".5\"><\/circle><\/g><\/svg><\/span><span role=\"button\" tabindex=\"0\" style=\"color:#D4D4D4;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>set(target_name reflection_hello)\n\nadd_executable(${target_name} main.cpp)\n\ntarget_sources(${target_name}\n        PRIVATE\n        FILE_SET CXX_MODULES\n        FILES\n        toy.ixx)\n\ntarget_compile_features(${target_name} PRIVATE cxx_std_26)<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2m-6 9l2 2 4-4\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2\"><\/path><\/svg><\/span><pre class=\"shiki dark-plus\" style=\"background-color: #1E1E1E\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #569CD6\">set<\/span><span style=\"color: #D4D4D4\">(target_name reflection_hello)<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #569CD6\">add_executable<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #569CD6\">${target_name}<\/span><span style=\"color: #D4D4D4\"> main.cpp)<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #569CD6\">target_sources<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #569CD6\">${target_name}<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        PRIVATE<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        FILE_SET CXX_MODULES<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        FILES<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        toy.ixx)<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #569CD6\">target_compile_features<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #569CD6\">${target_name}<\/span><span style=\"color: #D4D4D4\"> PRIVATE cxx_std_26)<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It is simple to enable C++26 language support for each target individually using <code>target_compile_features<\/code> command with <code>cxx_std_26<\/code> in Modern CMake. All Module Interface Units (<code>.ixx<\/code>, <code>.cppm<\/code>, etc.) should be grouped in a standalone <code>FILE_SET<\/code> <code>CXX_MODULES<\/code>. Here we get <code>toy.ixx<\/code> as a demo MIU file.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The Constexpr Table Construction<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Utilizing the newly introduced reflexpr operator <code>^^identifier<\/code> and splicer operator <code>[:r:]<\/code>, we can have access to the underlying AST data directly &#8211; no <code>#include<\/code> headers, no macros. Just pure C++ Modules and Static Reflection.<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro cbp-has-line-numbers\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono\" style=\"font-size:.875rem;font-family:Code-Pro-JetBrains-Mono,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;--cbp-line-number-color:#D4D4D4;--cbp-line-number-width:calc(2 * 0.6 * .875rem);line-height:1.25rem;--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:block;padding:16px 0 0 16px;margin-bottom:-1px;width:100%;text-align:left;background-color:#1E1E1E\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"54\" height=\"14\" viewBox=\"0 0 54 14\"><g fill=\"none\" fill-rule=\"evenodd\" transform=\"translate(1 1)\"><circle cx=\"6\" cy=\"6\" r=\"6\" fill=\"#FF5F56\" stroke=\"#E0443E\" stroke-width=\".5\"><\/circle><circle cx=\"26\" cy=\"6\" r=\"6\" fill=\"#FFBD2E\" stroke=\"#DEA123\" stroke-width=\".5\"><\/circle><circle cx=\"46\" cy=\"6\" r=\"6\" fill=\"#27C93F\" stroke=\"#1AAB29\" stroke-width=\".5\"><\/circle><\/g><\/svg><\/span><span role=\"button\" tabindex=\"0\" style=\"color:#D4D4D4;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>import std;\n\ntemplate &lt;typename T>\n    requires std::is_enum_v&lt;T>\nconsteval auto make_enum_to_string_table() noexcept {\n    \/\/ 1. Reflexpr operator fetches metadata token from AST\n    static constexpr auto r       = ^^T; \n    static constexpr auto members = std::define_static_array(std::meta::enumerators_of(r));\n\n    std::size_t index{};\n    std::array&lt;std::pair&lt;T, std::string_view>, members.size()> table{};\n\n    \/\/ 2. Compile-time loop expansion\n    template for (constexpr auto item : members) { \n        table&#91;index&#93;.first  = &#91;:item:&#93;;            \/\/ 3. Splicer operator (meta to value)\n        table&#91;index&#93;.second = std::meta::identifier_of(item);\n        ++index;\n    }\n\n    return table;\n}<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2m-6 9l2 2 4-4\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2\"><\/path><\/svg><\/span><pre class=\"shiki dark-plus\" style=\"background-color: #1E1E1E\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #D4D4D4\">import std;<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #569CD6\">template<\/span><span style=\"color: #D4D4D4\"> &lt;<\/span><span style=\"color: #569CD6\">typename<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #4EC9B0\">T<\/span><span style=\"color: #D4D4D4\">&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">requires<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #4EC9B0\">std<\/span><span style=\"color: #D4D4D4\">::is_enum_v&lt;T&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #569CD6\">consteval<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">auto<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #DCDCAA\">make_enum_to_string_table<\/span><span style=\"color: #D4D4D4\">() <\/span><span style=\"color: #569CD6\">noexcept<\/span><span style=\"color: #D4D4D4\"> {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\">    \/\/ 1. Reflexpr operator fetches metadata token from AST<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">static<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">constexpr<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">auto<\/span><span style=\"color: #D4D4D4\"> r       = ^^T; <\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">static<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">constexpr<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">auto<\/span><span style=\"color: #D4D4D4\"> members = <\/span><span style=\"color: #4EC9B0\">std<\/span><span style=\"color: #D4D4D4\">::<\/span><span style=\"color: #DCDCAA\">define_static_array<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #4EC9B0\">std<\/span><span style=\"color: #D4D4D4\">::<\/span><span style=\"color: #4EC9B0\">meta<\/span><span style=\"color: #D4D4D4\">::<\/span><span style=\"color: #DCDCAA\">enumerators_of<\/span><span style=\"color: #D4D4D4\">(r));<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #4EC9B0\">std<\/span><span style=\"color: #D4D4D4\">::<\/span><span style=\"color: #569CD6\">size_t<\/span><span style=\"color: #D4D4D4\"> index{};<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #4EC9B0\">std<\/span><span style=\"color: #D4D4D4\">::array&lt;<\/span><span style=\"color: #4EC9B0\">std<\/span><span style=\"color: #D4D4D4\">::pair&lt;T, <\/span><span style=\"color: #4EC9B0\">std<\/span><span style=\"color: #D4D4D4\">::string_view&gt;, <\/span><span style=\"color: #9CDCFE\">members<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #DCDCAA\">size<\/span><span style=\"color: #D4D4D4\">()&gt; table{};<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\">    \/\/ 2. Compile-time loop expansion<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    template <\/span><span style=\"color: #C586C0\">for<\/span><span style=\"color: #D4D4D4\"> (<\/span><span style=\"color: #569CD6\">constexpr<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">auto<\/span><span style=\"color: #D4D4D4\"> item : members) { <\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #9CDCFE\">table<\/span><span style=\"color: #D4D4D4\">&#91;index&#93;.<\/span><span style=\"color: #9CDCFE\">first<\/span><span style=\"color: #D4D4D4\">  = &#91;:item:&#93;;<\/span><span style=\"color: #6A9955\">            \/\/ 3. Splicer operator (meta to value)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #9CDCFE\">table<\/span><span style=\"color: #D4D4D4\">&#91;index&#93;.<\/span><span style=\"color: #9CDCFE\">second<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #4EC9B0\">std<\/span><span style=\"color: #D4D4D4\">::<\/span><span style=\"color: #4EC9B0\">meta<\/span><span style=\"color: #D4D4D4\">::<\/span><span style=\"color: #DCDCAA\">identifier_of<\/span><span style=\"color: #D4D4D4\">(item);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        ++index;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    }<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #C586C0\">return<\/span><span style=\"color: #D4D4D4\"> table;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">We use a <code>consteval<\/code> function <code>std::meta::enumerators_of<\/code> to fetch the <code>enum<\/code> elements at compile-time, then create a <code>std::array<\/code> table to store the name-value pairs as a return value to the caller &#8211; looks very programmer-friendly and readable. The <code>[:item:]<\/code> expression is a slicer operator that transforms a reflection to the original value. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Here comes a utility function <code>std::define_static_array<\/code> defined in <code>&lt;meta&gt;<\/code> in C++26 Reflection.<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro cbp-has-line-numbers\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono\" style=\"font-size:.875rem;font-family:Code-Pro-JetBrains-Mono,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;--cbp-line-number-color:#D4D4D4;--cbp-line-number-width:calc(1 * 0.6 * .875rem);line-height:1.25rem;--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:block;padding:16px 0 0 16px;margin-bottom:-1px;width:100%;text-align:left;background-color:#1E1E1E\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"54\" height=\"14\" viewBox=\"0 0 54 14\"><g fill=\"none\" fill-rule=\"evenodd\" transform=\"translate(1 1)\"><circle cx=\"6\" cy=\"6\" r=\"6\" fill=\"#FF5F56\" stroke=\"#E0443E\" stroke-width=\".5\"><\/circle><circle cx=\"26\" cy=\"6\" r=\"6\" fill=\"#FFBD2E\" stroke=\"#DEA123\" stroke-width=\".5\"><\/circle><circle cx=\"46\" cy=\"6\" r=\"6\" fill=\"#27C93F\" stroke=\"#1AAB29\" stroke-width=\".5\"><\/circle><\/g><\/svg><\/span><span role=\"button\" tabindex=\"0\" style=\"color:#D4D4D4;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>template&lt; ranges::input_range R >\nconsteval std::span&lt;const ranges::range_value_t&lt;R>> define_static_array( R&amp;&amp; r ); \/\/ Since C++26<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2m-6 9l2 2 4-4\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2\"><\/path><\/svg><\/span><pre class=\"shiki dark-plus\" style=\"background-color: #1E1E1E\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #569CD6\">template<\/span><span style=\"color: #D4D4D4\">&lt; <\/span><span style=\"color: #4EC9B0\">ranges<\/span><span style=\"color: #D4D4D4\">::<\/span><span style=\"color: #569CD6\">input_range<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #4EC9B0\">R<\/span><span style=\"color: #D4D4D4\"> &gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #569CD6\">consteval<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #4EC9B0\">std<\/span><span style=\"color: #D4D4D4\">::<\/span><span style=\"color: #4EC9B0\">span<\/span><span style=\"color: #D4D4D4\">&lt;<\/span><span style=\"color: #569CD6\">const<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #4EC9B0\">ranges<\/span><span style=\"color: #D4D4D4\">::<\/span><span style=\"color: #4EC9B0\">range_value_t<\/span><span style=\"color: #D4D4D4\">&lt;<\/span><span style=\"color: #4EC9B0\">R<\/span><span style=\"color: #D4D4D4\">&gt;&gt; <\/span><span style=\"color: #DCDCAA\">define_static_array<\/span><span style=\"color: #D4D4D4\">( <\/span><span style=\"color: #4EC9B0\">R<\/span><span style=\"color: #569CD6\">&amp;&amp;<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">r<\/span><span style=\"color: #D4D4D4\"> );<\/span><span style=\"color: #6A9955\"> \/\/ Since C++26<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It promotes array to static storage. Let <code>N<\/code> be  <code><strong>static_cast<\/strong>&lt;std::size_t&gt;(ranges::size(r))<\/code> if <code>ranges::size(r)<\/code> is a constant expression, or <code>std::dynamic_extent<\/code> otherwise. The effect is equivalent to:<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro cbp-has-line-numbers\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono\" style=\"font-size:.875rem;font-family:Code-Pro-JetBrains-Mono,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;--cbp-line-number-color:#D4D4D4;--cbp-line-number-width:calc(1 * 0.6 * .875rem);line-height:1.25rem;--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:block;padding:16px 0 0 16px;margin-bottom:-1px;width:100%;text-align:left;background-color:#1E1E1E\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"54\" height=\"14\" viewBox=\"0 0 54 14\"><g fill=\"none\" fill-rule=\"evenodd\" transform=\"translate(1 1)\"><circle cx=\"6\" cy=\"6\" r=\"6\" fill=\"#FF5F56\" stroke=\"#E0443E\" stroke-width=\".5\"><\/circle><circle cx=\"26\" cy=\"6\" r=\"6\" fill=\"#FFBD2E\" stroke=\"#DEA123\" stroke-width=\".5\"><\/circle><circle cx=\"46\" cy=\"6\" r=\"6\" fill=\"#27C93F\" stroke=\"#1AAB29\" stroke-width=\".5\"><\/circle><\/g><\/svg><\/span><span role=\"button\" tabindex=\"0\" style=\"color:#D4D4D4;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>using T = ranges::range_value_t&lt;R>;\nstd::meta::info array = std::meta::reflect_constant_array(r);\nif (std::meta::is_array_type(std::meta::type_of(array)))\n    return std::span&lt;const T, N>(std::meta::extract&lt;const T*>(array),\n                                 std::meta::extent(std::meta::type_of(array)));\nelse\n    return std::span&lt;const T, N>(static_cast&lt;const T*>(nullptr), 0);<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2m-6 9l2 2 4-4\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2\"><\/path><\/svg><\/span><pre class=\"shiki dark-plus\" style=\"background-color: #1E1E1E\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #C586C0\">using<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #4EC9B0\">T<\/span><span style=\"color: #D4D4D4\"> = <\/span><span style=\"color: #4EC9B0\">ranges<\/span><span style=\"color: #D4D4D4\">::<\/span><span style=\"color: #4EC9B0\">range_value_t<\/span><span style=\"color: #D4D4D4\">&lt;<\/span><span style=\"color: #4EC9B0\">R<\/span><span style=\"color: #D4D4D4\">&gt;;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #4EC9B0\">std<\/span><span style=\"color: #D4D4D4\">::<\/span><span style=\"color: #4EC9B0\">meta<\/span><span style=\"color: #D4D4D4\">::info array = <\/span><span style=\"color: #4EC9B0\">std<\/span><span style=\"color: #D4D4D4\">::<\/span><span style=\"color: #4EC9B0\">meta<\/span><span style=\"color: #D4D4D4\">::<\/span><span style=\"color: #DCDCAA\">reflect_constant_array<\/span><span style=\"color: #D4D4D4\">(r);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">if<\/span><span style=\"color: #D4D4D4\"> (<\/span><span style=\"color: #4EC9B0\">std<\/span><span style=\"color: #D4D4D4\">::<\/span><span style=\"color: #4EC9B0\">meta<\/span><span style=\"color: #D4D4D4\">::<\/span><span style=\"color: #DCDCAA\">is_array_type<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #4EC9B0\">std<\/span><span style=\"color: #D4D4D4\">::<\/span><span style=\"color: #4EC9B0\">meta<\/span><span style=\"color: #D4D4D4\">::<\/span><span style=\"color: #DCDCAA\">type_of<\/span><span style=\"color: #D4D4D4\">(array)))<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #C586C0\">return<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #4EC9B0\">std<\/span><span style=\"color: #D4D4D4\">::<\/span><span style=\"color: #DCDCAA\">span<\/span><span style=\"color: #D4D4D4\">&lt;<\/span><span style=\"color: #569CD6\">const<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #4EC9B0\">T<\/span><span style=\"color: #D4D4D4\">, <\/span><span style=\"color: #4EC9B0\">N<\/span><span style=\"color: #D4D4D4\">&gt;(<\/span><span style=\"color: #4EC9B0\">std<\/span><span style=\"color: #D4D4D4\">::<\/span><span style=\"color: #4EC9B0\">meta<\/span><span style=\"color: #D4D4D4\">::<\/span><span style=\"color: #DCDCAA\">extract<\/span><span style=\"color: #D4D4D4\">&lt;<\/span><span style=\"color: #569CD6\">const<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #4EC9B0\">T<\/span><span style=\"color: #D4D4D4\">*&gt;(array),<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">                                 <\/span><span style=\"color: #4EC9B0\">std<\/span><span style=\"color: #D4D4D4\">::<\/span><span style=\"color: #4EC9B0\">meta<\/span><span style=\"color: #D4D4D4\">::<\/span><span style=\"color: #DCDCAA\">extent<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #4EC9B0\">std<\/span><span style=\"color: #D4D4D4\">::<\/span><span style=\"color: #4EC9B0\">meta<\/span><span style=\"color: #D4D4D4\">::<\/span><span style=\"color: #DCDCAA\">type_of<\/span><span style=\"color: #D4D4D4\">(array)));<\/span><\/span>\n<span class=\"line\"><span style=\"color: #C586C0\">else<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #C586C0\">return<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #4EC9B0\">std<\/span><span style=\"color: #D4D4D4\">::<\/span><span style=\"color: #DCDCAA\">span<\/span><span style=\"color: #D4D4D4\">&lt;<\/span><span style=\"color: #569CD6\">const<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #4EC9B0\">T<\/span><span style=\"color: #D4D4D4\">, <\/span><span style=\"color: #4EC9B0\">N<\/span><span style=\"color: #D4D4D4\">&gt;(<\/span><span style=\"color: #569CD6\">static_cast<\/span><span style=\"color: #D4D4D4\">&lt;<\/span><span style=\"color: #569CD6\">const<\/span><span style=\"color: #D4D4D4\"> T*&gt;(<\/span><span style=\"color: #569CD6\">nullptr<\/span><span style=\"color: #D4D4D4\">), <\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">);<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The return value of this function is a <code>std::span&lt;T&gt;<\/code> referencing to the promoted array, with static storage. Other similar functions are <code>std::define_static_string<\/code> and <code>std::define_static_object<\/code>. The utility is useful when we need to define some strings at compile-time, instead of using Non-type Template Parameters (NTTP), like <code>auto V<\/code> .<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The <code>template for<\/code> syntax in C++26, expands a compile-time determinable language construct into its elements, used as a more readable version than <code>std::apply<\/code> to multiple statements that apply the same logic to multiple expressions.<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro cbp-has-line-numbers\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono\" style=\"font-size:.875rem;font-family:Code-Pro-JetBrains-Mono,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;--cbp-line-number-color:#D4D4D4;--cbp-line-number-width:calc(2 * 0.6 * .875rem);line-height:1.25rem;--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:block;padding:16px 0 0 16px;margin-bottom:-1px;width:100%;text-align:left;background-color:#1E1E1E\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"54\" height=\"14\" viewBox=\"0 0 54 14\"><g fill=\"none\" fill-rule=\"evenodd\" transform=\"translate(1 1)\"><circle cx=\"6\" cy=\"6\" r=\"6\" fill=\"#FF5F56\" stroke=\"#E0443E\" stroke-width=\".5\"><\/circle><circle cx=\"26\" cy=\"6\" r=\"6\" fill=\"#FFBD2E\" stroke=\"#DEA123\" stroke-width=\".5\"><\/circle><circle cx=\"46\" cy=\"6\" r=\"6\" fill=\"#27C93F\" stroke=\"#1AAB29\" stroke-width=\".5\"><\/circle><\/g><\/svg><\/span><span role=\"button\" tabindex=\"0\" style=\"color:#D4D4D4;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>static constexpr std::array array{1, 2, 3, 4, 5};\nstatic constexpr std::tuple tuple{\"Hello\", 12345, \"World\", std::vector{-1, -2, -3}};\nstatic constexpr std::span span{array};\n\ntemplate for (constexpr auto item : array) {\n    std::println(\"Array item: {}\", item);\n}\n\n\ntemplate for (constexpr auto item : tuple) {\n    \/\/ TODO: Process items here.\n}\n\ntemplate for (constexpr auto item : span) {\n    std::println(\"Span item: {}\", item);\n}\n\n\/\/ Expands index pack, a replacement to std::make_index_sequence.\ntemplate for (constexpr auto index : std::views::iota(0, 10)) {\n    std::println(\"Index: {}\", index);\n}<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2m-6 9l2 2 4-4\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2\"><\/path><\/svg><\/span><pre class=\"shiki dark-plus\" style=\"background-color: #1E1E1E\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #569CD6\">static<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">constexpr<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #4EC9B0\">std<\/span><span style=\"color: #D4D4D4\">::array array{<\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">, <\/span><span style=\"color: #B5CEA8\">2<\/span><span style=\"color: #D4D4D4\">, <\/span><span style=\"color: #B5CEA8\">3<\/span><span style=\"color: #D4D4D4\">, <\/span><span style=\"color: #B5CEA8\">4<\/span><span style=\"color: #D4D4D4\">, <\/span><span style=\"color: #B5CEA8\">5<\/span><span style=\"color: #D4D4D4\">};<\/span><\/span>\n<span class=\"line\"><span style=\"color: #569CD6\">static<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">constexpr<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #4EC9B0\">std<\/span><span style=\"color: #D4D4D4\">::tuple tuple{<\/span><span style=\"color: #CE9178\">&quot;Hello&quot;<\/span><span style=\"color: #D4D4D4\">, <\/span><span style=\"color: #B5CEA8\">12345<\/span><span style=\"color: #D4D4D4\">, <\/span><span style=\"color: #CE9178\">&quot;World&quot;<\/span><span style=\"color: #D4D4D4\">, <\/span><span style=\"color: #4EC9B0\">std<\/span><span style=\"color: #D4D4D4\">::vector{-<\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">, -<\/span><span style=\"color: #B5CEA8\">2<\/span><span style=\"color: #D4D4D4\">, -<\/span><span style=\"color: #B5CEA8\">3<\/span><span style=\"color: #D4D4D4\">}};<\/span><\/span>\n<span class=\"line\"><span style=\"color: #569CD6\">static<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">constexpr<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #4EC9B0\">std<\/span><span style=\"color: #D4D4D4\">::span span{array};<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #569CD6\">template<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #C586C0\">for<\/span><span style=\"color: #D4D4D4\"> (<\/span><span style=\"color: #569CD6\">constexpr<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">auto<\/span><span style=\"color: #D4D4D4\"> item : array) {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #4EC9B0\">std<\/span><span style=\"color: #D4D4D4\">::<\/span><span style=\"color: #DCDCAA\">println<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #CE9178\">&quot;Array item: {}&quot;<\/span><span style=\"color: #D4D4D4\">, item);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">}<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #569CD6\">template<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #C586C0\">for<\/span><span style=\"color: #D4D4D4\"> (<\/span><span style=\"color: #569CD6\">constexpr<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">auto<\/span><span style=\"color: #D4D4D4\"> item : tuple) {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\">    \/\/ TODO: Process items here.<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">}<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #569CD6\">template<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #C586C0\">for<\/span><span style=\"color: #D4D4D4\"> (<\/span><span style=\"color: #569CD6\">constexpr<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">auto<\/span><span style=\"color: #D4D4D4\"> item : span) {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #4EC9B0\">std<\/span><span style=\"color: #D4D4D4\">::<\/span><span style=\"color: #DCDCAA\">println<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #CE9178\">&quot;Span item: {}&quot;<\/span><span style=\"color: #D4D4D4\">, item);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">}<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #6A9955\">\/\/ Expands index pack, a replacement to std::make_index_sequence.<\/span><\/span>\n<span class=\"line\"><span style=\"color: #569CD6\">template<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #C586C0\">for<\/span><span style=\"color: #D4D4D4\"> (<\/span><span style=\"color: #569CD6\">constexpr<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">auto<\/span><span style=\"color: #D4D4D4\"> index : <\/span><span style=\"color: #4EC9B0\">std<\/span><span style=\"color: #D4D4D4\">::<\/span><span style=\"color: #4EC9B0\">views<\/span><span style=\"color: #D4D4D4\">::<\/span><span style=\"color: #DCDCAA\">iota<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">, <\/span><span style=\"color: #B5CEA8\">10<\/span><span style=\"color: #D4D4D4\">)) {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #4EC9B0\">std<\/span><span style=\"color: #D4D4D4\">::<\/span><span style=\"color: #DCDCAA\">println<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #CE9178\">&quot;Index: {}&quot;<\/span><span style=\"color: #D4D4D4\">, index);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The Enum-to-String Implementation<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">With the clean, modern implementation of static table creation, now we can implement the final <code>enum_to_string<\/code> function that can be invoked at runtime.<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro cbp-has-line-numbers\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono\" style=\"font-size:.875rem;font-family:Code-Pro-JetBrains-Mono,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;--cbp-line-number-color:#D4D4D4;--cbp-line-number-width:calc(2 * 0.6 * .875rem);line-height:1.25rem;--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:block;padding:16px 0 0 16px;margin-bottom:-1px;width:100%;text-align:left;background-color:#1E1E1E\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"54\" height=\"14\" viewBox=\"0 0 54 14\"><g fill=\"none\" fill-rule=\"evenodd\" transform=\"translate(1 1)\"><circle cx=\"6\" cy=\"6\" r=\"6\" fill=\"#FF5F56\" stroke=\"#E0443E\" stroke-width=\".5\"><\/circle><circle cx=\"26\" cy=\"6\" r=\"6\" fill=\"#FFBD2E\" stroke=\"#DEA123\" stroke-width=\".5\"><\/circle><circle cx=\"46\" cy=\"6\" r=\"6\" fill=\"#27C93F\" stroke=\"#1AAB29\" stroke-width=\".5\"><\/circle><\/g><\/svg><\/span><span role=\"button\" tabindex=\"0\" style=\"color:#D4D4D4;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>import std;\n\ntemplate &lt;typename T>\n    requires std::is_enum_v&lt;T>\nconstexpr std::string_view enum_to_string(T value) noexcept {\n    static constexpr auto table = make_enum_to_string_table&lt;T>();\n\n    template for (constexpr auto item : table) {\n        if (item.first == value) {\n            return item.second;\n        }\n    }\n    \n    return {};\n}\n\nint main() {\n    enum class task_status { ready, running, pending, stopped };\n    \n    auto status = task_status::running;\n    \n    std::println(\"Status: {}\", enum_to_string(status));\n}<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2m-6 9l2 2 4-4\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2\"><\/path><\/svg><\/span><pre class=\"shiki dark-plus\" style=\"background-color: #1E1E1E\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #D4D4D4\">import std;<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #569CD6\">template<\/span><span style=\"color: #D4D4D4\"> &lt;<\/span><span style=\"color: #569CD6\">typename<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #4EC9B0\">T<\/span><span style=\"color: #D4D4D4\">&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">requires<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #4EC9B0\">std<\/span><span style=\"color: #D4D4D4\">::is_enum_v&lt;T&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #569CD6\">constexpr<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #4EC9B0\">std<\/span><span style=\"color: #D4D4D4\">::<\/span><span style=\"color: #4EC9B0\">string_view<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #DCDCAA\">enum_to_string<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #4EC9B0\">T<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">value<\/span><span style=\"color: #D4D4D4\">) <\/span><span style=\"color: #569CD6\">noexcept<\/span><span style=\"color: #D4D4D4\"> {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">static<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">constexpr<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">auto<\/span><span style=\"color: #D4D4D4\"> table = <\/span><span style=\"color: #DCDCAA\">make_enum_to_string_table<\/span><span style=\"color: #D4D4D4\">&lt;<\/span><span style=\"color: #4EC9B0\">T<\/span><span style=\"color: #D4D4D4\">&gt;();<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    template <\/span><span style=\"color: #C586C0\">for<\/span><span style=\"color: #D4D4D4\"> (<\/span><span style=\"color: #569CD6\">constexpr<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">auto<\/span><span style=\"color: #D4D4D4\"> item : table) {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #C586C0\">if<\/span><span style=\"color: #D4D4D4\"> (<\/span><span style=\"color: #9CDCFE\">item<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">first<\/span><span style=\"color: #D4D4D4\"> == value) {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">            <\/span><span style=\"color: #C586C0\">return<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #9CDCFE\">item<\/span><span style=\"color: #D4D4D4\">.<\/span><span style=\"color: #9CDCFE\">second<\/span><span style=\"color: #D4D4D4\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        }<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    }<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #C586C0\">return<\/span><span style=\"color: #D4D4D4\"> {};<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">}<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #569CD6\">int<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #DCDCAA\">main<\/span><span style=\"color: #D4D4D4\">() {<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">enum<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">class<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #4EC9B0\">task_status<\/span><span style=\"color: #D4D4D4\"> { <\/span><span style=\"color: #4FC1FF\">ready<\/span><span style=\"color: #D4D4D4\">, <\/span><span style=\"color: #4FC1FF\">running<\/span><span style=\"color: #D4D4D4\">, <\/span><span style=\"color: #4FC1FF\">pending<\/span><span style=\"color: #D4D4D4\">, <\/span><span style=\"color: #4FC1FF\">stopped<\/span><span style=\"color: #D4D4D4\"> };<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">auto<\/span><span style=\"color: #D4D4D4\"> status = <\/span><span style=\"color: #4EC9B0\">task_status<\/span><span style=\"color: #D4D4D4\">::running;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #4EC9B0\">std<\/span><span style=\"color: #D4D4D4\">::<\/span><span style=\"color: #DCDCAA\">println<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #CE9178\">&quot;Status: {}&quot;<\/span><span style=\"color: #D4D4D4\">, <\/span><span style=\"color: #DCDCAA\">enum_to_string<\/span><span style=\"color: #D4D4D4\">(status));<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">How it works under the hood:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>The <code>table = make_enum_to_string_table&lt;T&gt;();<\/code> Statement:<\/strong> This generates a <code>constexpr std::array&lt;std::pair&lt;std::string_view, T&gt;&gt;<\/code> aka. <code>T<\/code> is an <code>enum<\/code> type. It&#8217;s a lightweight lookup table with static storage.<\/li>\n\n\n\n<li><strong>The <code>template for(...)<\/code> Statement: <\/strong>Unlike a traditional runtime <code>for<\/code> loop, this unrolls at compile-time. It only duplicates the loop body for every element in the <code>table<\/code> array, injecting them directly into the generated code.<\/li>\n\n\n\n<li><strong>True O(1) Memory Layout<\/strong>: The <code>table<\/code> is marked <code>static constexpr<\/code>. The entire string mapping is baked into the binary&#8217;s <code>.rodata<\/code> section during compilation. Zero heap allocations, zero runtime parsing.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tired of using heavy third-party libraries like magic_enum and relfection-cpp that abuse macro hacks and crush compiler template limits just to print an enum name?<\/p>\n<p>With C++26 Static Reflection (P2996), the compiler finally natively understands its own AST. Combining this  &#8230; <a href=\"https:\/\/refvalue.org\/index.php\/2026\/07\/03\/c26-reflection-practice-1-basics-and-enum-to-string\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">C++26 Reflection Practice 1: Basics and Enum-to-String<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[10,4],"tags":[5,46,13,48,45,47],"class_list":["post-2727","post","type-post","status-publish","format-standard","hentry","category-c","category-c-standard","tag-c","tag-c26","tag-cmake","tag-enum-to-string","tag-gcc","tag-reflection"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>C++26 Reflection Practice 1: Basics and Enum-to-String - Refvalue&#039;s Whispering Woods<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/refvalue.org\/index.php\/2026\/07\/03\/c26-reflection-practice-1-basics-and-enum-to-string\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C++26 Reflection Practice 1: Basics and Enum-to-String - Refvalue&#039;s Whispering Woods\" \/>\n<meta property=\"og:description\" content=\"Tired of using heavy third-party libraries like magic_enum and relfection-cpp that abuse macro hacks and crush compiler template limits just to print an enum name?  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