mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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87 lines
3.4 KiB
C++
87 lines
3.4 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2015 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_NTH_HPP
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#define SPROUT_CONTAINER_NTH_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_nth(...);
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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>::iterator
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range_nth(Container& cont, typename sprout::container_traits<Container>::size_type i) {
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return sprout::container_range_traits<Container>::range_nth(cont, i);
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}
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template<typename Container>
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inline SPROUT_CONSTEXPR typename sprout::container_traits<Container const>::iterator
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range_nth(Container const& cont, typename sprout::container_traits<Container const>::size_type i) {
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return sprout::container_range_traits<Container>::range_nth(cont, i);
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}
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} // namespace container_detail
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//
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// nth
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//
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// effect:
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// ADL callable range_nth(cont, i) -> range_nth(cont, i)
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// otherwise -> sprout::container_range_traits<Container>::range_nth(cont, i)
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// [default]
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// callable cont.nth(i) -> cont.nth(i)
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// otherwise -> *next(begin(cont), i)
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//
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template<typename Container>
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inline SPROUT_CONSTEXPR typename sprout::container_traits<Container>::iterator
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nth(Container& cont, typename sprout::container_traits<Container>::size_type i) {
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using sprout::container_detail::range_nth;
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using sprout_adl::range_nth;
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return range_nth(cont, i);
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}
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template<typename Container>
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inline SPROUT_CONSTEXPR typename sprout::container_traits<Container const>::iterator
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nth(Container const& cont, typename sprout::container_traits<Container const>::size_type i) {
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using sprout::container_detail::range_nth;
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using sprout_adl::range_nth;
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return range_nth(cont, i);
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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]>::iterator
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nth(T (& arr)[N], typename sprout::container_traits<T[N]>::size_type i) {
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return sprout::container_detail::range_nth(arr, i);
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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]>::iterator
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nth(T const (& arr)[N], typename sprout::container_traits<T const[N]>::size_type i) {
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return sprout::container_detail::range_nth(arr, i);
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}
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//
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// cnth
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//
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template<typename Container>
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inline SPROUT_CONSTEXPR typename sprout::container_traits<Container const>::iterator
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cnth(Container const& cont, typename sprout::container_traits<Container const>::size_type i) {
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return sprout::nth(cont, i);
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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]>::iterator
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cnth(T const (& arr)[N], typename sprout::container_traits<T const[N]>::size_type i) {
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return sprout::nth(arr, i);
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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_NTH_HPP
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