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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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20
sprout/utility/pair/tuple.hpp
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@ -13,22 +13,26 @@
#include <sprout/utility/pair/pair.hpp>
#include <sprout/utility/move.hpp>
#include <sprout/type_traits/integral_constant.hpp>
#include <sprout/type_traits/identity.hpp>
#include <sprout/detail/nil_base.hpp>
namespace sprout {
namespace tuples {
namespace detail {
template<std::size_t I, typename T>
struct tuple_element_impl;
template<std::size_t I, typename T1, typename T2>
struct tuple_element_impl<I, sprout::pair<T1, T2> >
: public sprout::detail::nil_base
{};
template<typename T1, typename T2>
struct tuple_element_impl<0, sprout::pair<T1, T2> > {
public:
typedef T1 type;
};
struct tuple_element_impl<0, sprout::pair<T1, T2> >
: public sprout::identity<T1>
{};
template<typename T1, typename T2>
struct tuple_element_impl<1, sprout::pair<T1, T2> > {
public:
typedef T2 type;
};
struct tuple_element_impl<1, sprout::pair<T1, T2> >
: public sprout::identity<T2>
{};
template<std::size_t I, typename T>
struct get_impl;