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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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11
sprout/utility/pack.hpp
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@ -15,6 +15,7 @@
#include <sprout/type_traits/integral_constant.hpp>
#include <sprout/type_traits/identity.hpp>
#include <sprout/type_traits/enabler_if.hpp>
#include <sprout/detail/nil_base.hpp>
namespace sprout {
//
@ -30,7 +31,7 @@ namespace sprout {
//
template<std::size_t I, typename T, T... Args>
struct pack_element_c
: public sprout::pack_element<I, sprout::integral_constant<T, Args>...>::type
: public sprout::pack_element<I, sprout::integral_constant<T, Args>...>
{};
//
@ -59,10 +60,16 @@ namespace sprout {
//
// head_element
//
template<typename... Args>
struct head_element;
template<typename Head, typename... Tail>
struct head_element
struct head_element<Head, Tail...>
: public sprout::identity<Head>
{};
template<>
struct head_element<>
: public sprout::detail::nil_base
{};
//
// head_get