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add _ placeholder User-defined literals

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bolero-MURAKAMI 2013-07-07 19:10:25 +09:00
parent 50f2ba6e31
commit 2f86a59273
7 changed files with 188 additions and 116 deletions
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22
sprout/detail/digits_to_int.hpp Normal file
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#ifndef SPROUT_DETAIL_DIGITS_TO_INT_HPP
#define SPROUT_DETAIL_DIGITS_TO_INT_HPP
#include <type_traits>
#include <sprout/config.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
} // namespace sprout
#endif // #ifndef SPROUT_DETAIL_DIGITS_TO_INT_HPP