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Chapter17/cib/libs/stdx/ct_conversions.hpp

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+#pragma once
+
+#include <stdx/compiler.hpp>
+
+#include <cstddef>
+#include <string_view>
+
+namespace stdx {
+inline namespace v1 {
+template <typename Tag>
+CONSTEVAL static auto type_as_string() -> std::string_view {
+#if defined(__clang__)
+    constexpr std::string_view function_name = __PRETTY_FUNCTION__;
+    constexpr auto rhs = function_name.size() - 2;
+#elif defined(__GNUC__) || defined(__GNUG__)
+    constexpr std::string_view function_name = __PRETTY_FUNCTION__;
+    constexpr auto rhs = function_name.size() - 51;
+#else
+    static_assert(false, "Unknown compiler, can't build type name.");
+#endif
+
+    constexpr auto lhs = function_name.rfind('=', rhs) + 2;
+    return function_name.substr(lhs, rhs - lhs + 1);
+}
+
+template <auto Value>
+CONSTEVAL static auto enum_as_string() -> std::basic_string_view<char> {
+#if defined(__clang__)
+    constexpr std::string_view value_string = __PRETTY_FUNCTION__;
+    constexpr auto rhs = value_string.size() - 2;
+#elif defined(__GNUC__) || defined(__GNUG__)
+    constexpr std::string_view value_string = __PRETTY_FUNCTION__;
+    constexpr auto rhs = value_string.size() - 2;
+#else
+    static_assert(false, "Unknown compiler, can't build type name.");
+#endif
+
+    constexpr auto lhs = [&]() -> std::string_view::size_type {
+        if (auto const colon_pos = value_string.find_last_of(':');
+            colon_pos != std::string_view::npos) {
+            return colon_pos + 1;
+        }
+        return 0;
+    }();
+    return value_string.substr(lhs, rhs - lhs + 1);
+}
+} // namespace v1
+} // namespace stdx