mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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88 lines
2.8 KiB
C++
88 lines
2.8 KiB
C++
#ifndef SPROUT_WEED_DETAIL_DIGITS_HPP
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#define SPROUT_WEED_DETAIL_DIGITS_HPP
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/string.hpp>
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#include <sprout/array.hpp>
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#include <sprout/tuple/tuple.hpp>
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#include HDR_ALGORITHM_SSCRISK_CEL_OR_SPROUT
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#include HDR_ITERATOR_SSCRISK_CEL_OR_SPROUT
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namespace sprout {
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namespace weed {
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namespace detail {
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template<typename Elem>
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struct digits;
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template<>
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struct digits<char> {
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public:
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SPROUT_STATIC_CONSTEXPR sprout::basic_string<char, 10> table = sprout::to_string("0123456789");
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};
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SPROUT_CONSTEXPR sprout::basic_string<char, 10> sprout::weed::detail::digits<char>::table;
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template<>
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struct digits<wchar_t> {
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public:
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SPROUT_STATIC_CONSTEXPR sprout::basic_string<wchar_t, 10> table = sprout::to_string(L"0123456789");
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};
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SPROUT_CONSTEXPR sprout::basic_string<wchar_t, 10> sprout::weed::detail::digits<wchar_t>::table;
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template<>
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struct digits<char16_t> {
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public:
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SPROUT_STATIC_CONSTEXPR sprout::basic_string<char16_t, 10> table = sprout::to_string(u"0123456789");
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};
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SPROUT_CONSTEXPR sprout::basic_string<char16_t, 10> sprout::weed::detail::digits<char16_t>::table;
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template<>
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struct digits<char32_t> {
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public:
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SPROUT_STATIC_CONSTEXPR sprout::basic_string<char32_t, 10> table = sprout::to_string(U"0123456789");
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};
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SPROUT_CONSTEXPR sprout::basic_string<char32_t, 10> sprout::weed::detail::digits<char32_t>::table;
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template<typename Dummy>
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struct values;
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template<>
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struct values<void> {
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public:
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SPROUT_STATIC_CONSTEXPR sprout::array<std::uint8_t, 10> table = sprout::array<std::uint8_t, 10>{
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{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
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};
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};
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SPROUT_CONSTEXPR sprout::array<std::uint8_t, 10> sprout::weed::detail::values<void>::table;
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template<typename IntType>
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SPROUT_CONSTEXPR sprout::tuples::tuple<IntType, bool> value_at(std::size_t i) {
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return i < 10
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? sprout::tuples::tuple<IntType, bool>(
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static_cast<IntType>(sprout::weed::detail::values<void>::table[i]),
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true
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)
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: sprout::tuples::tuple<IntType, bool>(
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IntType(),
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false
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)
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;
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}
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template<typename IntType, typename Elem>
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SPROUT_CONSTEXPR sprout::tuples::tuple<IntType, bool> from_digit(Elem c) {
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return sprout::weed::detail::value_at<IntType>(
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NS_SSCRISK_CEL_OR_SPROUT::distance(
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sprout::weed::detail::digits<Elem>::table.begin(),
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NS_SSCRISK_CEL_OR_SPROUT::find(
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sprout::weed::detail::digits<Elem>::table.begin(),
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sprout::weed::detail::digits<Elem>::table.end(),
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c
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)
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)
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);
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}
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} // namespace detail
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} // namespace weed
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} // namespace sprout
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#endif // #ifndef SPROUT_WEED_DETAIL_DIGITS_HPP
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