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add subscript_at function

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bolero-MURAKAMI 2016-04-17 19:36:56 +09:00
parent 8278a2642c
commit 0080332dd5
12 changed files with 341 additions and 54 deletions
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sprout/container/subscript_at.hpp Normal file
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/*=============================================================================
Copyright (c) 2011-2016 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_SUBSCRIPT_AT_HPP
#define SPROUT_CONTAINER_SUBSCRIPT_AT_HPP
#include <sprout/config.hpp>
#include <sprout/workaround/std/cstddef.hpp>
#include <sprout/container/traits_fwd.hpp>
#include <sprout/container/container_traits.hpp>
namespace sprout {
//
// subscript_at
//
// effect:
// sprout::container_range_traits<Container>::range_subscript_at(cont, i)
// [default]
// ADL callable range_subscript_at(cont, i) -> range_subscript_at(cont, i)
// [default]
// Container is T[N] -> cont[i]
// otherwise, Container is not const
// && sprout::is_const_cast_convertible<const_reference, reference>
// && (callable sprout::as_const(cont)[i]
// || callable sprout::as_const(cont).begin()
// || ADL(without sprout) callable begin(sprout::as_const(cont))
// )
// -> const_cast<reference>(sprout::subscript_at(sprout::as_const(cont), i))
// otherwise, callable cont[i] -> cont[i]
// otherwise -> *sprout::next(sprout::begin(cont), i)
//
template<typename Container>
inline SPROUT_CONSTEXPR typename sprout::container_traits<Container>::reference
subscript_at(Container& cont, typename sprout::container_traits<Container>::size_type i) {
return sprout::container_range_traits<Container>::range_subscript_at(cont, i);
}
template<typename Container>
inline SPROUT_CONSTEXPR typename sprout::container_traits<Container const>::reference
subscript_at(Container const& cont, typename sprout::container_traits<Container const>::size_type i) {
return sprout::container_range_traits<Container const>::range_subscript_at(cont, i);
}
template<typename T, std::size_t N>
inline SPROUT_CONSTEXPR typename sprout::container_traits<T[N]>::reference
subscript_at(T (& arr)[N], typename sprout::container_traits<T[N]>::size_type i) {
return sprout::container_range_traits<T[N]>::range_subscript_at(arr, i);
}
template<typename T, std::size_t N>
inline SPROUT_CONSTEXPR typename sprout::container_traits<T const[N]>::reference
subscript_at(T const (& arr)[N], typename sprout::container_traits<T const[N]>::size_type i) {
return sprout::container_range_traits<T const[N]>::range_subscript_at(arr, i);
}
//
// csubscript_at
//
template<typename Container>
inline SPROUT_CONSTEXPR typename sprout::container_traits<Container const>::reference
csubscript_at(Container const& cont, typename sprout::container_traits<Container const>::size_type i) {
return sprout::subscript_at(cont, i);
}
template<typename T, std::size_t N>
inline SPROUT_CONSTEXPR typename sprout::container_traits<T const[N]>::reference
csubscript_at(T const (& arr)[N], typename sprout::container_traits<T const[N]>::size_type i) {
return sprout::subscript_at(arr, i);
}
} // namespace sprout
#include <sprout/container/container_range_traits.hpp>
#endif // #ifndef SPROUT_CONTAINER_SUBSCRIPT_AT_HPP