mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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102 lines
3.3 KiB
C++
102 lines
3.3 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2015 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_DETAIL_INT_HPP
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#define SPROUT_DETAIL_INT_HPP
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/type_traits/enabler_if.hpp>
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#include <sprout/type_traits/is_sint.hpp>
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#include <sprout/type_traits/is_uint.hpp>
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namespace sprout {
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namespace detail {
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//
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// int_digits_mf
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//
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template<typename IntType, IntType Val, int Base = 10, bool = Val != 0>
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struct int_digits_mf_impl;
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template<typename IntType, IntType Val, int Base>
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struct int_digits_mf_impl<IntType, Val, Base, false>
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: public sprout::integral_constant<IntType, 0>
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{};
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template<typename IntType, IntType Val, int Base>
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struct int_digits_mf_impl<IntType, Val, Base, true>
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: public sprout::integral_constant<IntType, 1 + sprout::detail::int_digits_mf_impl<IntType, Val / Base, Base>::value>
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{};
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template<typename IntType, IntType Val, int Base = 10, bool = Val != 0>
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struct int_digits_mf;
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template<typename IntType, IntType Val, int Base>
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struct int_digits_mf<IntType, Val, Base, false>
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: public sprout::integral_constant<IntType, 1>
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{};
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template<typename IntType, IntType Val, int Base>
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struct int_digits_mf<IntType, Val, Base, true>
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: public sprout::integral_constant<IntType, 1 + sprout::detail::int_digits_mf_impl<IntType, Val / Base, Base>::value>
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{};
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//
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// int_pow
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//
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template<
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typename IntType, int Base = 10,
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typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR IntType
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int_pow(int exponent) {
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return exponent ? Base * sprout::detail::int_pow<IntType, Base>(exponent - 1)
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: 1
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;
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}
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//
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// int_digits
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//
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template<int Base = 10, typename IntType>
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inline SPROUT_CONSTEXPR int
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int_digits_impl(IntType val) {
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return val ? 1 + sprout::detail::int_digits_impl<Base>(val / Base)
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: 0
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;
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}
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template<
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int Base = 10, typename IntType,
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typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR int
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int_digits(IntType val) {
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return val ? 1 + sprout::detail::int_digits_impl<Base>(val / Base)
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: 1
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;
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}
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//
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// int_digit_at
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//
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template<
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int Base = 10, typename IntType,
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typename sprout::enabler_if<sprout::is_sint<IntType>::value>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR int
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int_digit_at(IntType val, int digits) {
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return val < 0 ? -((val / sprout::detail::int_pow<IntType, Base>(digits)) % Base)
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: (val / sprout::detail::int_pow<IntType, Base>(digits)) % Base
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;
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}
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template<
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int Base = 10, typename IntType,
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typename sprout::enabler_if<sprout::is_uint<IntType>::value>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR int
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int_digit_at(IntType val, int digits) {
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return (val / sprout::detail::int_pow<IntType, Base>(digits)) % Base;
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}
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} // namespace detail
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} // namespace sprout
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#endif // #ifndef SPROUT_DETAIL_INT_HPP
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