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add _indexes User-defined literals

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bolero-MURAKAMI 2013-04-07 21:55:55 +09:00
parent 410c369a6a
commit f0dfb208e0
3 changed files with 82 additions and 0 deletions
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67
sprout/index_tuple/udl.hpp Normal file
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@ -0,0 +1,67 @@
#ifndef SPROUT_INDEX_TUPLE_UDL_HPP
#define SPROUT_INDEX_TUPLE_UDL_HPP
#include <sprout/config.hpp>
#include <sprout/index_tuple/index_tuple.hpp>
#if SPROUT_USE_USER_DEFINED_LITERALS
#include <type_traits>
#include <sprout/index_tuple/make_index_tuple.hpp>
namespace sprout {
namespace detail {
template<typename IntType, char... Chars>
struct digits_to_int;
template<typename IntType, char C>
struct digits_to_int<IntType, C>
: public std::integral_constant<IntType, IntType(C - 48)>
{};
template<typename IntType, char Head, char... Tail>
struct digits_to_int<IntType, Head, Tail...>
: public std::integral_constant<IntType, 10 * IntType(Head - 48) + sprout::detail::digits_to_int<IntType, Tail...>::value>
{};
} // namespace detail
//
// indexes_result
//
template<char... Chars>
struct indexes_result
: public sprout::make_index_tuple<sprout::detail::digits_to_int<sprout::index_t, Chars...>::value>
{};
//
// uindexes_result
//
template<char... Chars>
struct uindexes_result
: public sprout::make_uindex_tuple<sprout::detail::digits_to_int<sprout::uindex_t, Chars...>::value>
{};
namespace udl {
//
// _indexes
//
template<char... Chars>
SPROUT_CONSTEXPR typename sprout::indexes_result<Chars...>::type
operator "" _indexes() {
return sprout::indexes_result<Chars...>::make();
}
//
// _uindexes
//
template<char... Chars>
SPROUT_CONSTEXPR typename sprout::uindexes_result<Chars...>::type
operator "" _uindexes() {
return sprout::uindexes_result<Chars...>::make();
}
} // namespace udl
using sprout::udl::operator "" _indexes;
using sprout::udl::operator "" _uindexes;
} // namespace sprout
#endif // #if SPROUT_USE_USER_DEFINED_LITERALS
#endif // #ifndef SPROUT_INDEX_TUPLE_UDL_HPP

1
sprout/index_tuple/utility.hpp
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@ -4,5 +4,6 @@
#include <sprout/config.hpp>
#include <sprout/index_tuple/make_indexes.hpp>
#include <sprout/index_tuple/enable_make_indexes.hpp>
#include <sprout/index_tuple/udl.hpp>
#endif // #ifndef SPROUT_INDEX_TUPLE_UTILITY_HPP