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add non-member function nth(), index_of()

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bolero-MURAKAMI 2015-03-23 00:26:20 +09:00
parent 6a9cda9d4c
commit c3636c10d2
7 changed files with 390 additions and 6 deletions
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sprout/container/nth.hpp Normal file
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/*=============================================================================
Copyright (c) 2011-2015 Bolero MURAKAMI
https://github.com/bolero-MURAKAMI/Sprout
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
=============================================================================*/
#ifndef SPROUT_CONTAINER_NTH_HPP
#define SPROUT_CONTAINER_NTH_HPP
#include <sprout/config.hpp>
#include <sprout/workaround/std/cstddef.hpp>
#include <sprout/container/traits_fwd.hpp>
#include <sprout/container/container_traits.hpp>
#include <sprout/adl/not_found.hpp>
namespace sprout_adl {
sprout::not_found_via_adl range_nth(...);
} // namespace sprout_adl
namespace sprout {
namespace container_detail {
template<typename Container>
inline SPROUT_CONSTEXPR typename sprout::container_traits<Container>::iterator
range_nth(Container& cont, typename sprout::container_traits<Container>::size_type i) {
return sprout::container_range_traits<Container>::range_nth(cont, i);
}
template<typename Container>
inline SPROUT_CONSTEXPR typename sprout::container_traits<Container const>::iterator
range_nth(Container const& cont, typename sprout::container_traits<Container const>::size_type i) {
return sprout::container_range_traits<Container>::range_nth(cont, i);
}
} // namespace container_detail
//
// nth
//
// effect:
// ADL callable range_nth(cont, i) -> range_nth(cont, i)
// otherwise -> sprout::container_range_traits<Container>::range_nth(cont, i)
// [default]
// callable cont.nth(i) -> cont.nth(i)
// otherwise -> *next(begin(cont), i)
//
template<typename Container>
inline SPROUT_CONSTEXPR typename sprout::container_traits<Container>::iterator
nth(Container& cont, typename sprout::container_traits<Container>::size_type i) {
using sprout::container_detail::range_nth;
using sprout_adl::range_nth;
return range_nth(cont, i);
}
template<typename Container>
inline SPROUT_CONSTEXPR typename sprout::container_traits<Container const>::iterator
nth(Container const& cont, typename sprout::container_traits<Container const>::size_type i) {
using sprout::container_detail::range_nth;
using sprout_adl::range_nth;
return range_nth(cont, i);
}
template<typename T, std::size_t N>
inline SPROUT_CONSTEXPR typename sprout::container_traits<T[N]>::iterator
nth(T (& arr)[N], typename sprout::container_traits<T[N]>::size_type i) {
return sprout::container_detail::range_nth(arr, i);
}
template<typename T, std::size_t N>
inline SPROUT_CONSTEXPR typename sprout::container_traits<T const[N]>::iterator
nth(T const (& arr)[N], typename sprout::container_traits<T const[N]>::size_type i) {
return sprout::container_detail::range_nth(arr, i);
}
//
// cnth
//
template<typename Container>
inline SPROUT_CONSTEXPR typename sprout::container_traits<Container const>::iterator
cnth(Container const& cont, typename sprout::container_traits<Container const>::size_type i) {
return sprout::nth(cont, i);
}
template<typename T, std::size_t N>
inline SPROUT_CONSTEXPR typename sprout::container_traits<T const[N]>::iterator
cnth(T const (& arr)[N], typename sprout::container_traits<T const[N]>::size_type i) {
return sprout::nth(arr, i);
}
} // namespace sprout
#include <sprout/container/container_range_traits.hpp>
#endif // #ifndef SPROUT_CONTAINER_NTH_HPP