merge changes from the defunct ubot

ext/crlib/cr-movable.h

@@ -0,0 +1,64 @@
+//
+// CRLib - Simple library for STL replacement in private projects.
+// Copyright © 2020 YaPB Development Team <team@yapb.ru>.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+// 
+
+#pragma once
+
+#include <crlib/cr-basic.h>
+
+CR_NAMESPACE_BEGIN
+
+namespace detail {
+   template <typename T> struct ClearRef {
+      using Type = T;
+   };
+   template <typename T> struct ClearRef <T &> {
+      using Type = T;
+   };
+   template <typename T> struct ClearRef <T &&> {
+      using Type = T;
+   };
+}
+
+template <typename T> typename detail::ClearRef <T>::Type constexpr &&move (T &&type) noexcept {
+   return static_cast <typename detail::ClearRef <T>::Type &&> (type);
+}
+
+template <typename T> constexpr T &&forward (typename detail::ClearRef <T>::Type &type) noexcept {
+   return static_cast <T &&> (type);
+}
+
+template <typename T> constexpr T &&forward (typename detail::ClearRef <T>::Type &&type) noexcept {
+   return static_cast <T &&> (type);
+}
+
+template <typename T> inline void swap (T &left, T &right) noexcept {
+   auto temp = cr::move (left);
+   left = cr::move (right);
+   right = cr::move (temp);
+}
+
+template <typename T, size_t S> inline void swap (T (&left)[S], T (&right)[S]) noexcept {
+   if (&left == &right) {
+      return;
+   }
+   auto begin = left;
+   auto end = begin + S;
+
+   for (auto temp = right; begin != end; ++begin, ++temp) {
+      cr::swap (*begin, *temp);
+   }
+}
+
+CR_NAMESPACE_END