mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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78 lines
2.5 KiB
C++
78 lines
2.5 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2016 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#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/array.hpp>
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#include <sprout/tuple/tuple.hpp>
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#include <sprout/iterator/operation.hpp>
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#include <sprout/algorithm/find.hpp>
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#include <sprout/detail/literal_def.hpp>
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namespace sprout {
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namespace weed {
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namespace detail {
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SPROUT_LITERAL_STRING_DEF(digits, "0123456789", 10);
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template<typename Dummy, typename X = void>
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struct values;
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# define SPROUT_WEED_DIGITS_TABLE_DEF \
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{{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}}
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template<typename X>
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struct values<void, X> {
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public:
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typedef sprout::array<std::uint8_t, 10> value_type;
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public:
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SPROUT_STATIC_CONSTEXPR value_type value
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SPROUT_STATIC_CONSTEXPR_DATA_MEMBER_INNER(SPROUT_WEED_DIGITS_TABLE_DEF)
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;
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};
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template<typename X>
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SPROUT_CONSTEXPR_OR_CONST typename sprout::weed::detail::values<void, X>::value_type
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sprout::weed::detail::values<void, X>::value
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SPROUT_STATIC_CONSTEXPR_DATA_MEMBER_OUTER(SPROUT_WEED_DIGITS_TABLE_DEF)
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;
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# undef SPROUT_WEED_DIGITS_TABLE_DEF
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template<typename IntType>
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inline 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>::value[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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inline 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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sprout::distance(
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sprout::weed::detail::digits<Elem>::value.begin(),
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sprout::find(
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sprout::weed::detail::digits<Elem>::value.begin(),
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sprout::weed::detail::digits<Elem>::value.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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