mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
74 lines
2.8 KiB
C++
74 lines
2.8 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2019 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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namespace sprout {
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//
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// front
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//
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// effect:
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// sprout::container_range_traits<Container>::range_front(cont)
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// [default]
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// ADL callable range_front(cont) -> range_front(cont)
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// [default]
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// Container is T[N] -> cont[0]
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// otherwise, Container is not const
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// && sprout::is_const_reference_cast_convertible<const_reference, reference>
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// && (callable sprout::as_const(cont).front()
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// || callable sprout::as_const(cont).begin()
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// || ADL(without sprout) callable begin(sprout::as_const(cont))
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// )
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// -> sprout::const_reference_cast<reference>(sprout::front(sprout::as_const(cont)))
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// otherwise, callable cont.front() -> cont.front()
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// otherwise -> *sprout::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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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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front(Container const& cont) {
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return sprout::container_range_traits<Container const>::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_range_traits<T[N]>::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_range_traits<T const[N]>::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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