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fix tuple_element: support SFINAE-friendly

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This commit is contained in:
bolero-MURAKAMI 2014-05-29 00:25:37 +09:00
parent f42e92b448
commit c15de6136b
64 changed files with 984 additions and 113 deletions
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48
sprout/tuple/tuple/tuple_element.hpp
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@ -12,33 +12,61 @@
#include <tuple>
#include <sprout/config.hpp>
#include <sprout/workaround/std/cstddef.hpp>
#include <sprout/detail/nil_base.hpp>
namespace sprout {
namespace tuples {
//
// tuple_element
//
namespace detail {
template<std::size_t I, typename T, bool = (I < std::tuple_size<T>::value)>
struct tuple_element_default;
template<std::size_t I, typename T>
struct tuple_element_default<I, T, false>
: public sprout::detail::nil_base
{};
template<std::size_t I, typename T>
struct tuple_element_default<I, T, true>
: public std::tuple_element<I, T>
{};
} // namespace detail
template<std::size_t I, typename T>
struct tuple_element
: public std::tuple_element<I, T>
: public sprout::tuples::detail::tuple_element_default<I, T>
{};
namespace detail {
template<std::size_t I, typename T>
struct tuple_element_default<I, T const, true>
: public std::add_const<
typename sprout::tuples::tuple_element<I, T>::type
>
{};
template<std::size_t I, typename T>
struct tuple_element_default<I, T volatile, true>
: public std::add_volatile<
typename sprout::tuples::tuple_element<I, T>::type
>
{};
template<std::size_t I, typename T>
struct tuple_element_default<I, T const volatile, true>
: public std::add_cv<
typename sprout::tuples::tuple_element<I, T>::type
>
{};
} // namespace detail
template<std::size_t I, typename T>
struct tuple_element<I, T const>
: public std::add_const<
typename sprout::tuples::tuple_element<I, T>::type
>
: public sprout::tuples::detail::tuple_element_default<I, T const>
{};
template<std::size_t I, typename T>
struct tuple_element<I, T volatile>
: public std::add_volatile<
typename sprout::tuples::tuple_element<I, T>::type
>
: public sprout::tuples::detail::tuple_element_default<I, T volatile>
{};
template<std::size_t I, typename T>
struct tuple_element<I, T const volatile>
: public std::add_cv<
typename sprout::tuples::tuple_element<I, T>::type
>
: public sprout::tuples::detail::tuple_element_default<I, T const volatile>
{};
} // namespace tuples