simple name_of impl for types (msvc)

develop/singles/headers/meta.hpp/meta_all.hpp

@@ -1016,6 +1016,49 @@ namespace std
     };
 }
 
+namespace meta_hpp::detail
+{
+    namespace impl
+    {
+        template < typename T >
+        struct name_of_wrapper_impl {};
+
+        template < typename T >
+        [[nodiscard]] constexpr std::string_view name_of_impl() noexcept {
+#if META_HPP_DETAIL_COMPILER_ID == META_HPP_DETAIL_CLANG_COMPILER_ID
+            constexpr auto prefix = std::string_view{"[T = "};
+            constexpr auto suffix = std::string_view{"]"};
+            constexpr auto fnsign = std::string_view{__PRETTY_FUNCTION__};
+#elif META_HPP_DETAIL_COMPILER_ID == META_HPP_DETAIL_GCC_COMPILER_ID
+            constexpr auto prefix = std::string_view{"with T = "};
+            constexpr auto suffix = std::string_view{"]"};
+            constexpr auto fnsign = std::string_view{__PRETTY_FUNCTION__};
+#elif META_HPP_DETAIL_COMPILER_ID == META_HPP_DETAIL_MSVC_COMPILER_ID
+            constexpr auto prefix = std::string_view{"name_of_wrapper_impl<"};
+            constexpr auto suffix = std::string_view{">>(void)"};
+            constexpr auto fnsign = std::string_view{__FUNCSIG__};
+#else
+            constexpr auto prefix = std::string_view{"<"};
+            constexpr auto suffix = std::string_view{">"};
+            constexpr auto fnsign = std::string_view{"<unknown>"};
+#endif
+            constexpr auto b = fnsign.find(prefix) + prefix.size();
+            constexpr auto e = fnsign.rfind(suffix);
+            static_assert(b < e);
+
+            auto n = fnsign.substr(b, e - b);
+            n.remove_prefix(std::min(n.find_first_not_of(' '), n.size()));
+            n.remove_suffix(std::min(n.size() - n.find_last_not_of(' ') - 1, n.size()));
+            return n;
+        }
+    }
+
+    template < typename T >
+    [[nodiscard]] constexpr std::string_view name_of() noexcept {
+        return impl::name_of_impl<impl::name_of_wrapper_impl<T>>();
+    }
+}
+
 namespace meta_hpp::detail
 {
     class noncopyable {

develop/untests/meta_base/name_of_tests.cpp

@@ -0,0 +1,44 @@
+/*******************************************************************************
+ * This file is part of the "https://github.com/blackmatov/meta.hpp"
+ * For conditions of distribution and use, see copyright notice in LICENSE.md
+ * Copyright (C) 2021-2023, by Matvey Cherevko (blackmatov@gmail.com)
+ ******************************************************************************/
+
+#include <meta.hpp/meta_all.hpp>
+#include <doctest/doctest.h>
+
+namespace meta_tests_ns
+{
+    struct A {
+        int member{42};
+        int add(int) {return 42;}
+        static int sub(int) { return 42;}
+    };
+
+    enum class E {};
+}
+
+TEST_CASE("meta/meta_base/name_of") {
+    namespace meta = meta_hpp;
+    using meta::detail::name_of;
+
+#if META_HPP_DETAIL_COMPILER_ID == META_HPP_DETAIL_MSVC_COMPILER_ID
+    CHECK(name_of<meta_tests_ns::E>() == "enum meta_tests_ns::E");
+
+    CHECK(name_of<meta_tests_ns::A>() == "struct meta_tests_ns::A");
+    CHECK(name_of<meta_tests_ns::A[]>() == "struct meta_tests_ns::A [0]");
+    CHECK(name_of<meta_tests_ns::A*>() == "struct meta_tests_ns::A *");
+    CHECK(name_of<meta_tests_ns::A&>() == "struct meta_tests_ns::A &");
+    CHECK(name_of<const meta_tests_ns::A&>() == "struct meta_tests_ns::A const &");
+
+    CHECK(name_of<decltype(&meta_tests_ns::A::add)>() == "int (__cdecl meta_tests_ns::A::*)(int)");
+    CHECK(name_of<decltype(&meta_tests_ns::A::sub)>() == "int (__cdecl*)(int)");
+    CHECK(name_of<decltype(&meta_tests_ns::A::member)>() == "int meta_tests_ns::A::*");
+
+    CHECK(name_of<int>() == "int");
+    CHECK(name_of<float>() == "float");
+
+    CHECK(name_of<void>() == "void");
+    CHECK(name_of<const void>() == "void const");
+#endif
+}

headers/meta.hpp/meta_base.hpp

@@ -18,6 +18,7 @@
 #include "meta_base/insert_or_assign.hpp"
 #include "meta_base/is_in_place_type.hpp"
 #include "meta_base/memory_buffer.hpp"
+#include "meta_base/name_of.hpp"
 #include "meta_base/noncopyable.hpp"
 #include "meta_base/nonesuch.hpp"
 #include "meta_base/overloaded.hpp"

headers/meta.hpp/meta_base/name_of.hpp

@@ -0,0 +1,52 @@
+/*******************************************************************************
+ * This file is part of the "https://github.com/blackmatov/meta.hpp"
+ * For conditions of distribution and use, see copyright notice in LICENSE.md
+ * Copyright (C) 2021-2023, by Matvey Cherevko (blackmatov@gmail.com)
+ ******************************************************************************/
+
+#pragma once
+
+#include "base.hpp"
+
+namespace meta_hpp::detail
+{
+    namespace impl
+    {
+        template < typename T >
+        struct name_of_wrapper_impl {};
+
+        template < typename T >
+        [[nodiscard]] constexpr std::string_view name_of_impl() noexcept {
+#if META_HPP_DETAIL_COMPILER_ID == META_HPP_DETAIL_CLANG_COMPILER_ID
+            constexpr auto prefix = std::string_view{"[T = "};
+            constexpr auto suffix = std::string_view{"]"};
+            constexpr auto fnsign = std::string_view{__PRETTY_FUNCTION__};
+#elif META_HPP_DETAIL_COMPILER_ID == META_HPP_DETAIL_GCC_COMPILER_ID
+            constexpr auto prefix = std::string_view{"with T = "};
+            constexpr auto suffix = std::string_view{"]"};
+            constexpr auto fnsign = std::string_view{__PRETTY_FUNCTION__};
+#elif META_HPP_DETAIL_COMPILER_ID == META_HPP_DETAIL_MSVC_COMPILER_ID
+            constexpr auto prefix = std::string_view{"name_of_wrapper_impl<"};
+            constexpr auto suffix = std::string_view{">>(void)"};
+            constexpr auto fnsign = std::string_view{__FUNCSIG__};
+#else
+            constexpr auto prefix = std::string_view{"<"};
+            constexpr auto suffix = std::string_view{">"};
+            constexpr auto fnsign = std::string_view{"<unknown>"};
+#endif
+            constexpr auto b = fnsign.find(prefix) + prefix.size();
+            constexpr auto e = fnsign.rfind(suffix);
+            static_assert(b < e);
+
+            auto n = fnsign.substr(b, e - b);
+            n.remove_prefix(std::min(n.find_first_not_of(' '), n.size()));
+            n.remove_suffix(std::min(n.size() - n.find_last_not_of(' ') - 1, n.size()));
+            return n;
+        }
+    }
+
+    template < typename T >
+    [[nodiscard]] constexpr std::string_view name_of() noexcept {
+        return impl::name_of_impl<impl::name_of_wrapper_impl<T>>();
+    }
+}