mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
88 lines
3 KiB
C++
88 lines
3 KiB
C++
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/*=============================================================================
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Copyright (c) 2011-2014 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_CONTAINER_FRONT_HPP
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#define SPROUT_CONTAINER_FRONT_HPP
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#include <sprout/config.hpp>
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#include <sprout/workaround/std/cstddef.hpp>
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#include <sprout/container/traits_fwd.hpp>
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#include <sprout/container/container_traits.hpp>
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#include <sprout/adl/not_found.hpp>
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namespace sprout_adl {
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sprout::not_found_via_adl range_front(...);
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} // namespace sprout_adl
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namespace sprout {
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namespace container_detail {
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template<typename Container>
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inline SPROUT_CONSTEXPR typename sprout::container_traits<Container>::reference
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range_front(Container& cont) {
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return sprout::container_range_traits<Container>::range_front(cont);
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}
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template<typename Container>
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inline SPROUT_CONSTEXPR typename sprout::container_traits<Container const>::reference
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range_front(Container const& cont) {
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return sprout::container_range_traits<Container>::range_front(cont);
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}
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} // namespace container_detail
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//
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// front
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//
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// effect:
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// ADL callable range_front(cont) -> range_front(cont)
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// otherwise -> sprout::container_range_traits<Container>::range_front(cont)
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// [default]
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// callable cont.front() -> cont.front()
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// otherwise -> *begin(cont)
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//
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template<typename Container>
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inline SPROUT_CONSTEXPR typename sprout::container_traits<Container>::reference
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front(Container& cont) {
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using sprout::container_detail::range_front;
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using sprout_adl::range_front;
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return range_front(cont);
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}
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template<typename Container>
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inline SPROUT_CONSTEXPR typename sprout::container_traits<Container const>::reference
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front(Container const& cont) {
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using sprout::container_detail::range_front;
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using sprout_adl::range_front;
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return range_front(cont);
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}
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template<typename T, std::size_t N>
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inline SPROUT_CONSTEXPR typename sprout::container_traits<T[N]>::reference
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front(T (& arr)[N]) {
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return sprout::container_detail::range_front(arr);
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}
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template<typename T, std::size_t N>
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inline SPROUT_CONSTEXPR typename sprout::container_traits<T const[N]>::reference
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front(T const (& arr)[N]) {
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return sprout::container_detail::range_front(arr);
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}
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//
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// cfront
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//
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template<typename Container>
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inline SPROUT_CONSTEXPR typename sprout::container_traits<Container const>::reference
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cfront(Container const& cont) {
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return sprout::front(cont);
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}
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template<typename T, std::size_t N>
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inline SPROUT_CONSTEXPR typename sprout::container_traits<T const[N]>::reference
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cfront(T const (& arr)[N]) {
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return sprout::front(arr);
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}
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} // namespace sprout
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#include <sprout/container/container_range_traits.hpp>
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#endif // #ifndef SPROUT_CONTAINER_FRONT_HPP
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