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add conversion string_ref to arithmetic-type

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bolero-MURAKAMI 2013-02-19 10:51:12 +09:00
parent 1ef8a6a63b
commit 2e0bc89188
10 changed files with 424 additions and 8 deletions
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109
sprout/utility/string_ref/string_to_float.hpp Normal file
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#ifndef SPROUT_UTILITY_STRING_REF_STRING_TO_FLOAT_HPP
#define SPROUT_UTILITY_STRING_REF_STRING_TO_FLOAT_HPP
#include <string>
#include <type_traits>
#include <sprout/config.hpp>
#include <sprout/utility/string_ref/string_ref.hpp>
#include <sprout/cstdlib/str_to_float.hpp>
#include <sprout/type_traits/enabler_if.hpp>
namespace sprout {
namespace detail {
template<
typename FloatType, typename Elem, typename Traits
>
inline FloatType string_to_float_dynamic(sprout::basic_string_ref<Elem, Traits> const& str, std::size_t* idx) {
Elem* endptr = nullptr;
FloatType result = sprout::detail::str_to_float<FloatType>(str.c_str(), &endptr);
*idx = endptr - str.c_str();
return result;
}
}
//
// string_to_float
//
template<
typename FloatType, typename Elem, typename Traits,
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR FloatType
string_to_float(sprout::basic_string_ref<Elem, Traits> const& str, std::size_t* idx) {
return !idx ? sprout::detail::str_to_float<FloatType>(str.begin())
: sprout::detail::string_to_float_dynamic<FloatType>(str, idx)
;
}
template<
typename FloatType, typename Elem, typename Traits,
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR FloatType
string_to_float(sprout::basic_string_ref<Elem, Traits> const& str) {
return sprout::detail::str_to_float<FloatType>(str.begin());
}
//
// stof
//
template<typename Elem, typename Traits>
inline SPROUT_CONSTEXPR float
stof(sprout::basic_string_ref<Elem, Traits> const& str, std::size_t* idx) {
return sprout::string_to_float<float>(str, idx);
}
template<typename Elem, typename Traits>
inline SPROUT_CONSTEXPR float
stof(sprout::basic_string_ref<Elem, Traits> const& str) {
return sprout::string_to_float<float>(str);
}
//
// stod
//
template<typename Elem, typename Traits>
inline SPROUT_CONSTEXPR double
stod(sprout::basic_string_ref<Elem, Traits> const& str, std::size_t* idx) {
return sprout::string_to_float<double>(str, idx);
}
template<typename Elem, typename Traits>
inline SPROUT_CONSTEXPR double
stod(sprout::basic_string_ref<Elem, Traits> const& str) {
return sprout::string_to_float<double>(str);
}
//
// stold
//
template<typename Elem, typename Traits>
inline SPROUT_CONSTEXPR long double
stold(sprout::basic_string_ref<Elem, Traits> const& str, std::size_t* idx) {
return sprout::string_to_float<long double>(str, idx);
}
template<typename Elem, typename Traits>
inline SPROUT_CONSTEXPR long double
stold(sprout::basic_string_ref<Elem, Traits> const& str) {
return sprout::string_to_float<long double>(str);
}
//
// from_string
//
template<
typename FloatType, typename Elem, typename Traits,
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR FloatType
from_string(sprout::basic_string_ref<Elem, Traits> const& str, std::size_t* idx) {
return sprout::string_to_float<FloatType>(str, idx);
}
template<
typename FloatType, typename Elem, typename Traits,
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR FloatType
from_string(sprout::basic_string_ref<Elem, Traits> const& str) {
return sprout::string_to_float<FloatType>(str);
}
} // namespace sprout
#endif // #ifndef SPROUT_UTILITY_STRING_REF_STRING_TO_FLOAT_HPP