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