Check C++ version in kumi entry point and group std headers

Author: Nxirda

include/kumi/detail.hpp

@@ -25,8 +25,8 @@ namespace kumi
   //================================================================================================
 }
 
-// Building blocks
 #include <kumi/detail/abi.hpp>
+#include <kumi/detail/dependencies.hpp>
 #include <kumi/detail/preprocessor.hpp>
 #include <kumi/detail/str.hpp>
 #include <kumi/detail/typename.hpp>

include/kumi/detail/abi.hpp

@@ -9,11 +9,13 @@
 
 #if defined(_MSC_VER)
 #if _MSVC_LANG < 202002L
-#error "KUMI requires C++20 or higher. Use /std:c++20 or higher to enable C++20 features."
+#error "KUMI C++ version error"
+#include "KUMI requires C++20 or higher. Use /std:c++20 or higher to enable C++20 features."
 #endif
 #else
 #if __cplusplus < 202002L
-#error "KUMI requires C++20 or higher. Use -std=c++20 or higher to enable C++20 features."
+#error "KUMI C++ version error"
+#include "KUMI requires C++20 or higher. Use -std=c++20 or higher to enable C++20 features."
 #endif
 #endif
 

include/kumi/detail/binder.hpp

@@ -7,9 +7,6 @@
 //======================================================================================================================
 #pragma once
 
-#include <cstddef>
-#include <utility>
-
 namespace kumi::_
 {
   //====================================================================================================================

include/kumi/detail/concepts.hpp

@@ -7,10 +7,6 @@
 //==================================================================================================
 #pragma once
 
-#include <concepts>
-#include <cstddef>
-#include <utility>
-
 namespace kumi::_
 {
   template<typename... Ts> struct type_list

include/kumi/detail/dependencies.hpp

@@ -0,0 +1,14 @@
+//==================================================================================================
+/*
+  KUMI - Compact Tuple Tools
+  Copyright : KUMI Project Contributors
+  SPDX-License-Identifier: BSL-1.0
+*/
+//==================================================================================================
+#pragma once
+
+#include <cstddef>
+#include <concepts>
+#include <iosfwd>
+#include <type_traits>
+#include <utility>

include/kumi/detail/meta_helpers.hpp

@@ -7,8 +7,6 @@
 //==================================================================================================
 #pragma once
 
-#include <cstddef>
-
 //==================================================================================================
 // Helpers for uniqueness checking
 //==================================================================================================

include/kumi/detail/optimized.hpp

@@ -7,9 +7,6 @@
 //==================================================================================================
 #pragma once
 
-#include <cstddef>
-#include <utility>
-
 namespace kumi::_
 {
   //================================================================================================

include/kumi/detail/stdfix.hpp

@@ -8,18 +8,17 @@
 #pragma once
 
 #if defined(__ANDROID__) || defined(__APPLE__)
-#include <type_traits>
 
 namespace kumi
 {
   template<typename From, typename To>
   concept convertible_to = std::is_convertible_v<From, To> && requires { static_cast<To>(std::declval<From>()); };
 }
 #else
-#include <concepts>
 
 namespace kumi
 {
   using std::convertible_to;
 }
+
 #endif

include/kumi/detail/str.hpp

@@ -7,9 +7,6 @@
 //==================================================================================================
 #pragma once
 
-#include <iosfwd>
-#include <utility>
-
 namespace kumi
 {
   //================================================================================================

include/kumi/detail/streamable.hpp

@@ -7,8 +7,6 @@
 //==================================================================================================
 #pragma once
 
-#include <iosfwd>
-
 namespace kumi::_
 {
   //================================================================================================