Sprout/sprout/detail/digits_to_int.hpp
2013-07-07 19:10:25 +09:00

22 lines
731 B
C++

#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