mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-12-25 21:35:41 +00:00
64 lines
2.8 KiB
C++
64 lines
2.8 KiB
C++
#ifndef SPROUT_CSTDLIB_DECIMAL_TO_INT_HPP
|
|
#define SPROUT_CSTDLIB_DECIMAL_TO_INT_HPP
|
|
|
|
#include <iterator>
|
|
#include <limits>
|
|
#include <type_traits>
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/iterator/operation.hpp>
|
|
#include <sprout/ctype/ascii.hpp>
|
|
#include <sprout/type_traits/enabler_if.hpp>
|
|
|
|
namespace sprout {
|
|
namespace detail {
|
|
// Copyright (c) 2011 osyo-manga : http://d.hatena.ne.jp/osyo-manga/
|
|
|
|
template<typename IntType, typename CStrIterator>
|
|
inline SPROUT_CONSTEXPR IntType
|
|
ascii_to_int_impl(CStrIterator str, IntType val, bool negative) {
|
|
return !sprout::ascii::isdigit(*str)
|
|
? negative ? -val : val
|
|
: val > (std::numeric_limits<IntType>::max() - (*str - static_cast<typename std::iterator_traits<CStrIterator>::value_type>('0')) - (negative ? 1 : 0)) / 10
|
|
? (negative ? std::numeric_limits<IntType>::min() : std::numeric_limits<IntType>::max())
|
|
: sprout::detail::ascii_to_int_impl<IntType>(
|
|
sprout::next(str),
|
|
val * 10 + (*str - static_cast<typename std::iterator_traits<CStrIterator>::value_type>('0')),
|
|
negative
|
|
)
|
|
;
|
|
}
|
|
template<typename IntType, typename CStrIterator, typename sprout::enabler_if<std::is_unsigned<IntType>::value>::type = sprout::enabler>
|
|
inline SPROUT_CONSTEXPR IntType
|
|
ascii_to_int(CStrIterator str) {
|
|
return sprout::ascii::isspace(*str)
|
|
? sprout::detail::ascii_to_int<IntType>(sprout::next(str))
|
|
: *str == static_cast<typename std::iterator_traits<CStrIterator>::value_type>('+')
|
|
? sprout::detail::ascii_to_int_impl<IntType>(sprout::next(str), IntType(), false)
|
|
: sprout::detail::ascii_to_int_impl<IntType>(str, IntType(), false)
|
|
;
|
|
}
|
|
template<typename IntType, typename CStrIterator, typename sprout::enabler_if<std::is_signed<IntType>::value>::type = sprout::enabler>
|
|
inline SPROUT_CONSTEXPR IntType
|
|
ascii_to_int(CStrIterator str) {
|
|
return sprout::ascii::isspace(*str)
|
|
? sprout::detail::ascii_to_int<IntType>(sprout::next(str))
|
|
: *str == static_cast<typename std::iterator_traits<CStrIterator>::value_type>('-')
|
|
? sprout::detail::ascii_to_int_impl<IntType>(sprout::next(str), IntType(), true)
|
|
: *str == static_cast<typename std::iterator_traits<CStrIterator>::value_type>('+')
|
|
? sprout::detail::ascii_to_int_impl<IntType>(sprout::next(str), IntType(), false)
|
|
: sprout::detail::ascii_to_int_impl<IntType>(str, IntType(), false)
|
|
;
|
|
}
|
|
} // namespace detail
|
|
|
|
//
|
|
// ascii_to_int
|
|
//
|
|
template<typename IntType, typename Char, typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler>
|
|
inline SPROUT_CONSTEXPR IntType
|
|
ascii_to_int(Char const* str) {
|
|
return sprout::detail::ascii_to_int<IntType>(str);
|
|
}
|
|
} // namespace sprout
|
|
|
|
#endif // #ifndef SPROUT_CSTDLIB_DECIMAL_TO_INT_HPP
|