mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
145 lines
5.2 KiB
C++
145 lines
5.2 KiB
C++
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/*=============================================================================
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Copyright (c) 2011-2013 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef SPROUT_ITERATOR_CONST_ITERATOR_CAST_HPP
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#define SPROUT_ITERATOR_CONST_ITERATOR_CAST_HPP
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/type_traits/integral_constant.hpp>
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#include <sprout/type_traits/identity.hpp>
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#include <sprout/type_traits/enabler_if.hpp>
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#include <sprout/adl/not_found.hpp>
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namespace sprout {
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//
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// is_const_iterator_cast_convertible
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//
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template<typename From, typename To>
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struct is_const_iterator_cast_convertible
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: public sprout::false_type
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{};
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template<typename From, typename To>
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struct is_const_iterator_cast_convertible<From, To const>
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: public sprout::is_const_iterator_cast_convertible<From, To>
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{};
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template<typename From, typename To>
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struct is_const_iterator_cast_convertible<From, To volatile>
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: public sprout::is_const_iterator_cast_convertible<From, To>
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{};
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template<typename From, typename To>
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struct is_const_iterator_cast_convertible<From, To const volatile>
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: public sprout::is_const_iterator_cast_convertible<From, To>
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{};
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template<typename From, typename To>
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struct is_const_iterator_cast_convertible<From const, To>
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: public sprout::is_const_iterator_cast_convertible<From, To>
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{};
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template<typename From, typename To>
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struct is_const_iterator_cast_convertible<From const, To const>
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: public sprout::is_const_iterator_cast_convertible<From, To>
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{};
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template<typename From, typename To>
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struct is_const_iterator_cast_convertible<From const, To volatile>
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: public sprout::is_const_iterator_cast_convertible<From, To>
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{};
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template<typename From, typename To>
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struct is_const_iterator_cast_convertible<From const, To const volatile>
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: public sprout::is_const_iterator_cast_convertible<From, To>
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{};
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template<typename From, typename To>
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struct is_const_iterator_cast_convertible<From volatile, To>
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: public sprout::is_const_iterator_cast_convertible<From, To>
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{};
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template<typename From, typename To>
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struct is_const_iterator_cast_convertible<From volatile, To const>
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: public sprout::is_const_iterator_cast_convertible<From, To>
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{};
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template<typename From, typename To>
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struct is_const_iterator_cast_convertible<From volatile, To volatile>
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: public sprout::is_const_iterator_cast_convertible<From, To>
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{};
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template<typename From, typename To>
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struct is_const_iterator_cast_convertible<From volatile, To const volatile>
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: public sprout::is_const_iterator_cast_convertible<From, To>
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{};
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template<typename From, typename To>
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struct is_const_iterator_cast_convertible<From const volatile, To>
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: public sprout::is_const_iterator_cast_convertible<From, To>
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{};
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template<typename From, typename To>
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struct is_const_iterator_cast_convertible<From const volatile, To const>
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: public sprout::is_const_iterator_cast_convertible<From, To>
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{};
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template<typename From, typename To>
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struct is_const_iterator_cast_convertible<From const volatile, To volatile>
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: public sprout::is_const_iterator_cast_convertible<From, To>
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{};
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template<typename From, typename To>
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struct is_const_iterator_cast_convertible<From const volatile, To const volatile>
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: public sprout::is_const_iterator_cast_convertible<From, To>
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{};
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template<typename From, typename To>
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struct is_const_iterator_cast_convertible<From*, To*>
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: public std::is_same<typename std::remove_const<From>::type, typename std::remove_const<To>::type>
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{};
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// //
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// // pointer_add_const
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// //
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// template<typename T>
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// struct pointer_add_const
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// : public std::add_const<T>
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// {};
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// template<typename T>
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// struct pointer_add_const<T*>
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// : public sprout::identity<typename std::add_const<T>::type*>
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// {};
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} // namespace sprout
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namespace sprout_adl {
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template<typename To>
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sprout::not_found_via_adl const_iterator_conversion(...);
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} // namespace sprout_adl
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namespace sprout {
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namespace iterator_detail {
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template<
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typename T,
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typename U,
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typename sprout::enabler_if<sprout::is_const_iterator_cast_convertible<U*, T>::value>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR T
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const_iterator_conversion(U* it) {
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return const_cast<T>(it);
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}
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} // namespace iterator_detail
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} // namespace sprout
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namespace sprout_iterator_detail {
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template<typename To, typename From>
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inline SPROUT_CONSTEXPR To
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const_iterator_cast(From const& it) {
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using sprout::iterator_detail::const_iterator_conversion;
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using sprout_adl::const_iterator_conversion;
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return const_iterator_conversion<To>(it);
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}
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} // namespace sprout_iterator_detail
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namespace sprout {
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//
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// const_iterator_cast
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//
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template<typename To, typename From>
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inline SPROUT_CONSTEXPR To
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const_iterator_cast(From const& it) {
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return sprout_iterator_detail::const_iterator_cast<To>(it);
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_ITERATOR_CONST_ITERATOR_CAST_HPP
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