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add _tail placeholders User-defined Literals

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This commit is contained in:
bolero-MURAKAMI 2013-07-09 01:37:01 +09:00
parent 8fa8d80ca2
commit 651d8deba8
2 changed files with 20 additions and 4 deletions
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16
sprout/functional/bind/udl.hpp
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@ -12,6 +12,7 @@
namespace sprout {
//
// placeholders_result
// variadic_placeholders_result
//
template<char... Chars>
struct placeholders_result
@ -19,11 +20,18 @@ namespace sprout {
sprout::placeholder<sprout::detail::digits_to_int<int, Chars...>::value>
>
{};
template<char... Chars>
struct variadic_placeholders_result
: public sprout::identity<
sprout::placeholder<sprout::is_placeholder<decltype(sprout::placeholders::_va)>::value - sprout::detail::digits_to_int<int, Chars...>::value>
>
{};
namespace placeholders {
namespace udl {
//
// _
// _tail
//
template<char... Chars>
SPROUT_CONSTEXPR typename sprout::placeholders_result<Chars...>::type
@ -31,15 +39,23 @@ namespace sprout {
typedef typename sprout::placeholders_result<Chars...>::type type;
return type();
}
template<char... Chars>
SPROUT_CONSTEXPR typename sprout::variadic_placeholders_result<Chars...>::type
operator"" _tail() {
typedef typename sprout::variadic_placeholders_result<Chars...>::type type;
return type();
}
} // namespace udl
} // namespace placeholders
namespace udl {
namespace placeholders {
using sprout::placeholders::udl::operator"" _;
using sprout::placeholders::udl::operator"" _tail;
} // namespace placeholders
using sprout::placeholders::udl::operator"" _;
using sprout::placeholders::udl::operator"" _tail;
} // namespace udl
} // namespace sprout