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add atoi, atol, strtol

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bolero-MURAKAMI 2012-04-15 00:48:31 +09:00
parent 1968a6fac4
commit 50fd5f33bf
11 changed files with 307 additions and 55 deletions
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95
sprout/cstdlib/str_to_int.hpp Normal file
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@ -0,0 +1,95 @@
#ifndef SPROUT_CSTDLIB_STR_TO_INT_HPP
#define SPROUT_CSTDLIB_STR_TO_INT_HPP
#include <cstddef>
#include <cstdlib>
#include <limits>
#include <sprout/config.hpp>
#include <sprout/iterator/operation.hpp>
#include <sprout/utility/enabler_if.hpp>
#include <sprout/detail/char_conversion.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 str_to_int_impl_1(CStrIterator str, int base, IntType val, IntType x, bool negative) {
return x == static_cast<IntType>(-1)
? (negative ? -val : val)
: val > (std::numeric_limits<IntType>::max() - x - (negative ? 1 : 0)) / base
? (negative ? std::numeric_limits<IntType>::min() : std::numeric_limits<IntType>::max())
: sprout::detail::str_to_int_impl_1<IntType>(
sprout::next(str),
base,
val * base + x,
sprout::detail::char_to_int<IntType>(*sprout::next(str), base),
negative
)
;
}
template<typename IntType, typename CStrIterator>
inline SPROUT_CONSTEXPR IntType str_to_int_impl(CStrIterator str, int base, bool negative) {
return *str == static_cast<typename std::iterator_traits<CStrIterator>::value_type>('0')
? *sprout::next(str) == static_cast<typename std::iterator_traits<CStrIterator>::value_type>('x')
|| *sprout::next(str) == static_cast<typename std::iterator_traits<CStrIterator>::value_type>('X')
? sprout::detail::str_to_int_impl_1<IntType>(
sprout::next(str, 2),
base ? base : 16,
IntType(),
sprout::detail::char_to_int<IntType>(*sprout::next(str, 2), base),
negative
)
: sprout::detail::str_to_int_impl_1<IntType>(
sprout::next(str),
base ? base : 8,
IntType(),
sprout::detail::char_to_int<IntType>(*sprout::next(str), base),
negative
)
: sprout::detail::str_to_int_impl_1<IntType>(
str,
base ? base : 10,
IntType(),
sprout::detail::char_to_int<IntType>(*str, base),
negative
)
;
}
template<typename IntType, typename CStrIterator>
inline SPROUT_CONSTEXPR IntType str_to_int(CStrIterator str, int base) {
return sprout::ascii::isspace(*str)
? sprout::detail::str_to_int<IntType>(sprout::next(str), base)
: *str == static_cast<typename std::iterator_traits<CStrIterator>::value_type>('-')
? sprout::detail::str_to_int_impl<IntType>(sprout::next(str), base, true)
: *str == static_cast<typename std::iterator_traits<CStrIterator>::value_type>('+')
? sprout::detail::str_to_int_impl<IntType>(sprout::next(str), base, false)
: sprout::detail::str_to_int_impl<IntType>(str, base, false)
;
}
template<typename IntType, typename CStrIterator, typename CharPtr>
inline SPROUT_CONSTEXPR IntType str_to_int(CStrIterator str, CharPtr* endptr, int base) {
return !endptr ? sprout::detail::str_to_int<IntType>(str, base)
: std::strtol(str, endptr, base)
;
}
} // namespace detail
//
// str_to_int
//
template<typename IntType, typename Char, typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler>
inline SPROUT_CONSTEXPR IntType str_to_int(Char const* str, Char** endptr, int base = 10) {
return sprout::detail::str_to_int<IntType>(str, endptr, base);
}
template<typename IntType, typename Char, typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler>
inline SPROUT_CONSTEXPR IntType str_to_int(Char const* str, std::nullptr_t endptr, int base = 10) {
return sprout::detail::str_to_int<IntType>(str, base);
}
template<typename IntType, typename Char, typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler>
inline SPROUT_CONSTEXPR IntType str_to_int(Char const* str, int base = 10) {
return sprout::detail::str_to_int<IntType>(str, base);
}
} // namespace sprout
#endif // #ifndef SPROUT_CSTDLIB_STR_TO_INT_HPP