mirror of
https://github.com/HowardHinnant/date.git
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669 lines
12 KiB
C++
669 lines
12 KiB
C++
#ifndef CHRONO_IO_H
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#define CHRONO_IO_H
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// The MIT License (MIT)
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//
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// Copyright (c) 2016 Howard Hinnant
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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//
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// Our apologies. When the previous paragraph was written, lowercase had not yet
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// been invented (that woud involve another several millennia of evolution).
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// We did not mean to shout.
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#include <chrono>
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#include <cstddef>
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#include <cstdint>
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#include <iosfwd>
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#include <ratio>
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#include <string>
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#include <type_traits>
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namespace date
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{
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namespace detail
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{
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#if __cplusplus >= 201402
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template <class CharT, std::size_t N>
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class string_literal
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{
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CharT p_[N];
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public:
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using const_iterator = const CharT*;
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string_literal(string_literal const&) = default;
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string_literal& operator=(string_literal const&) = delete;
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template <std::size_t N1 = 2,
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class = std::enable_if_t<N1 == N>>
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constexpr string_literal(CharT c) noexcept
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: p_{c}
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{
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}
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constexpr string_literal(const CharT(&a)[N]) noexcept
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: p_{}
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{
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for (std::size_t i = 0; i < N; ++i)
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p_[i] = a[i];
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}
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template <class U = CharT, class = std::enable_if_t<1 < sizeof(U)>>
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constexpr string_literal(const char(&a)[N]) noexcept
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: p_{}
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{
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for (std::size_t i = 0; i < N; ++i)
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p_[i] = a[i];
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}
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template <class CharT2, class = std::enable_if_t<!std::is_same<CharT2, CharT>{}>>
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constexpr string_literal(string_literal<CharT2, N> const& a) noexcept
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: p_{}
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{
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for (std::size_t i = 0; i < N; ++i)
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p_[i] = a[i];
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}
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template <std::size_t N1, std::size_t N2,
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class = std::enable_if_t<N1 + N2 - 1 == N>>
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constexpr string_literal(const string_literal<CharT, N1>& x,
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const string_literal<CharT, N2>& y) noexcept
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: p_{}
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{
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std::size_t i = 0;
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for (; i < N1-1; ++i)
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p_[i] = x[i];
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for (std::size_t j = 0; j < N2; ++j, ++i)
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p_[i] = y[j];
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}
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constexpr const CharT* data() const noexcept {return p_;}
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constexpr std::size_t size() const noexcept {return N-1;}
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constexpr const_iterator begin() const noexcept {return p_;}
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constexpr const_iterator end() const noexcept {return p_ + N-1;}
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constexpr CharT const& operator[](std::size_t n) const noexcept
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{
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return p_[n];
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}
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template <class Traits>
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friend
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std::basic_ostream<CharT, Traits>&
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operator<<(std::basic_ostream<CharT, Traits>& os, const string_literal& s)
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{
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return os << s.p_;
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}
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};
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template <class CharT1, class CharT2, std::size_t N1, std::size_t N2>
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constexpr
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inline
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string_literal<std::conditional_t<sizeof(CharT2) <= sizeof(CharT1), CharT1, CharT2>,
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N1 + N2 - 1>
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operator+(const string_literal<CharT1, N1>& x, const string_literal<CharT2, N2>& y) noexcept
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{
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using CharT = std::conditional_t<sizeof(CharT2) <= sizeof(CharT1), CharT1, CharT2>;
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return string_literal<CharT, N1 + N2 - 1>{string_literal<CharT, N1>{x},
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string_literal<CharT, N2>{y}};
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}
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template <class CharT, std::size_t N>
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constexpr
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inline
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string_literal<CharT, N>
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msl(const CharT(&a)[N]) noexcept
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{
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return string_literal<CharT, N>{a};
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}
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template <class CharT,
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class = std::enable_if_t<std::is_same<CharT, char>{} ||
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std::is_same<CharT, wchar_t>{} ||
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std::is_same<CharT, char16_t>{} ||
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std::is_same<CharT, char32_t>{}>>
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constexpr
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inline
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string_literal<CharT, 2>
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msl(CharT c) noexcept
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{
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return string_literal<CharT, 2>{c};
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}
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constexpr
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std::size_t
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to_string_len(std::intmax_t i)
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{
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std::size_t r = 0;
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do
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{
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i /= 10;
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++r;
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} while (i > 0);
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return r;
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}
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template <std::intmax_t N>
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constexpr
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inline
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std::enable_if_t
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<
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N < 10,
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string_literal<char, to_string_len(N)+1>
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>
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msl() noexcept
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{
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return msl(char(N % 10 + '0'));
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}
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template <std::intmax_t N>
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constexpr
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inline
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std::enable_if_t
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<
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10 <= N,
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string_literal<char, to_string_len(N)+1>
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>
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msl() noexcept
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{
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return msl<N/10>() + msl(char(N % 10 + '0'));
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}
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template <class CharT, std::intmax_t N, std::intmax_t D>
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constexpr
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inline
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std::enable_if_t
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<
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std::ratio<N, D>::type::den != 1,
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string_literal<CharT, to_string_len(std::ratio<N, D>::type::num) +
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to_string_len(std::ratio<N, D>::type::den) + 4>
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>
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msl(std::ratio<N, D>) noexcept
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{
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using R = typename std::ratio<N, D>::type;
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return msl(CharT{'['}) + msl<R::num>() + msl(CharT{'/'}) +
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msl<R::den>() + msl(CharT{']'});
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}
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template <class CharT, std::intmax_t N, std::intmax_t D>
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constexpr
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inline
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std::enable_if_t
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<
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std::ratio<N, D>::type::den == 1,
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string_literal<CharT, to_string_len(std::ratio<N, D>::type::num) + 3>
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>
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msl(std::ratio<N, D>) noexcept
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{
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using R = typename std::ratio<N, D>::type;
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return msl(CharT{'['}) + msl<R::num>() + msl(CharT{']'});
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}
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template <class CharT>
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constexpr
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inline
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auto
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msl(std::atto) noexcept
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{
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return msl(CharT{'a'});
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}
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template <class CharT>
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constexpr
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inline
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auto
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msl(std::femto) noexcept
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{
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return msl(CharT{'f'});
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}
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template <class CharT>
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constexpr
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inline
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auto
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msl(std::pico) noexcept
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{
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return msl(CharT{'p'});
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}
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template <class CharT>
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constexpr
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inline
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auto
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msl(std::nano) noexcept
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{
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return msl(CharT{'n'});
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}
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template <class CharT>
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constexpr
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inline
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std::enable_if_t
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<
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std::is_same<CharT, char>{},
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string_literal<char, 3>
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>
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msl(std::micro) noexcept
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{
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return string_literal<char, 3>{"\xC2\xB5"};
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}
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template <class CharT>
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constexpr
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inline
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std::enable_if_t
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<
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!std::is_same<CharT, char>{},
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string_literal<CharT, 2>
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>
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msl(std::micro) noexcept
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{
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return string_literal<CharT, 2>{CharT{static_cast<unsigned char>('\xB5')}};
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}
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template <class CharT>
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constexpr
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inline
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auto
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msl(std::milli) noexcept
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{
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return msl(CharT{'m'});
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}
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template <class CharT>
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constexpr
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inline
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auto
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msl(std::centi) noexcept
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{
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return msl(CharT{'c'});
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}
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template <class CharT>
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constexpr
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inline
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auto
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msl(std::deci) noexcept
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{
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return msl(CharT{'d'});
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}
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template <class CharT>
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constexpr
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inline
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auto
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msl(std::deca) noexcept
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{
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return string_literal<CharT, 3>{"da"};
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}
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template <class CharT>
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constexpr
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inline
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auto
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msl(std::hecto) noexcept
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{
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return msl(CharT{'h'});
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}
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template <class CharT>
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constexpr
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inline
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auto
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msl(std::kilo) noexcept
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{
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return msl(CharT{'k'});
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}
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template <class CharT>
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constexpr
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inline
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auto
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msl(std::mega) noexcept
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{
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return msl(CharT{'M'});
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}
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template <class CharT>
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constexpr
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inline
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auto
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msl(std::giga) noexcept
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{
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return msl(CharT{'G'});
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}
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template <class CharT>
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constexpr
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inline
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auto
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msl(std::tera) noexcept
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{
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return msl(CharT{'T'});
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}
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template <class CharT>
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constexpr
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inline
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auto
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msl(std::peta) noexcept
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{
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return msl(CharT{'P'});
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}
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template <class CharT>
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constexpr
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inline
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auto
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msl(std::exa) noexcept
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{
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return msl(CharT{'E'});
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}
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template <class CharT, class Period>
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constexpr
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auto
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get_units(Period p)
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{
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return msl<CharT>(p) + string_literal<CharT, 2>{"s"};
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}
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template <class CharT>
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constexpr
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auto
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get_units(std::ratio<1>)
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{
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return string_literal<CharT, 2>{"s"};
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}
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template <class CharT>
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constexpr
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auto
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get_units(std::ratio<60>)
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{
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return string_literal<CharT, 4>{"min"};
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}
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template <class CharT>
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constexpr
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auto
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get_units(std::ratio<3600>)
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{
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return string_literal<CharT, 2>{"h"};
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}
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#else // __cplusplus < 201402
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inline
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std::string
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to_string(std::uint64_t x)
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{
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return std::to_string(x);
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}
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template <class CharT>
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std::basic_string<CharT>
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to_string(std::uint64_t x)
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{
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auto y = std::to_string(x);
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return std::basic_string<CharT>(y.begin(), y.end());
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}
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template <class CharT, std::intmax_t N, std::intmax_t D>
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constexpr
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inline
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typename std::enable_if
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<
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std::ratio<N, D>::type::den != 1,
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std::basic_string<CharT>
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>::type
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msl(std::ratio<N, D>) noexcept
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{
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using R = typename std::ratio<N, D>::type;
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return std::basic_string<CharT>(1, '[') + to_string<CharT>(R::num) + CharT{'/'} +
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to_string<CharT>(R::den) + CharT{']'};
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}
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template <class CharT, std::intmax_t N, std::intmax_t D>
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constexpr
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inline
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typename std::enable_if
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<
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std::ratio<N, D>::type::den == 1,
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std::basic_string<CharT>
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>::type
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msl(std::ratio<N, D>) noexcept
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{
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using R = typename std::ratio<N, D>::type;
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return std::basic_string<CharT>(1, '[') + to_string<CharT>(R::num) + CharT{']'};
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}
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template <class CharT>
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constexpr
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inline
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std::basic_string<CharT>
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msl(std::atto) noexcept
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{
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return {'a'};
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}
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template <class CharT>
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constexpr
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inline
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std::basic_string<CharT>
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msl(std::femto) noexcept
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{
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return {'f'};
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}
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template <class CharT>
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constexpr
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inline
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std::basic_string<CharT>
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msl(std::pico) noexcept
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{
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return {'p'};
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}
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template <class CharT>
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constexpr
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inline
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std::basic_string<CharT>
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msl(std::nano) noexcept
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{
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return {'n'};
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}
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|
template <class CharT>
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constexpr
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inline
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typename std::enable_if
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<
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std::is_same<CharT, char>::value,
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std::string
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>::type
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msl(std::micro) noexcept
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{
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return "\xC2\xB5";
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}
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|
template <class CharT>
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constexpr
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inline
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typename std::enable_if
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<
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!std::is_same<CharT, char>::value,
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std::basic_string<CharT>
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>::type
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msl(std::micro) noexcept
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{
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return {CharT(static_cast<unsigned char>('\xB5'))};
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}
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template <class CharT>
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constexpr
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inline
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std::basic_string<CharT>
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msl(std::milli) noexcept
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{
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return {'m'};
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}
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template <class CharT>
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constexpr
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inline
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std::basic_string<CharT>
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msl(std::centi) noexcept
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{
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return {'c'};
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}
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template <class CharT>
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constexpr
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inline
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std::basic_string<CharT>
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msl(std::deci) noexcept
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{
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return {'d'};
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}
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template <class CharT>
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constexpr
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inline
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std::basic_string<CharT>
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msl(std::deca) noexcept
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{
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return {'d', 'a'};
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}
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template <class CharT>
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constexpr
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inline
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std::basic_string<CharT>
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msl(std::hecto) noexcept
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{
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return {'h'};
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}
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template <class CharT>
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constexpr
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inline
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std::basic_string<CharT>
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msl(std::kilo) noexcept
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{
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return {'k'};
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}
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template <class CharT>
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constexpr
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inline
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std::basic_string<CharT>
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msl(std::mega) noexcept
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{
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return {'M'};
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}
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template <class CharT>
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constexpr
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inline
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std::basic_string<CharT>
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msl(std::giga) noexcept
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{
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return {'G'};
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}
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template <class CharT>
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constexpr
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inline
|
|
std::basic_string<CharT>
|
|
msl(std::tera) noexcept
|
|
{
|
|
return {'T'};
|
|
}
|
|
|
|
template <class CharT>
|
|
constexpr
|
|
inline
|
|
std::basic_string<CharT>
|
|
msl(std::peta) noexcept
|
|
{
|
|
return {'P'};
|
|
}
|
|
|
|
template <class CharT>
|
|
constexpr
|
|
inline
|
|
std::basic_string<CharT>
|
|
msl(std::exa) noexcept
|
|
{
|
|
return {'E'};
|
|
}
|
|
|
|
template <class CharT, class Period>
|
|
std::basic_string<CharT>
|
|
get_units(Period p)
|
|
{
|
|
return msl<CharT>(p) + CharT{'s'};
|
|
}
|
|
|
|
template <class CharT>
|
|
std::basic_string<CharT>
|
|
get_units(std::ratio<1>)
|
|
{
|
|
return {'s'};
|
|
}
|
|
|
|
template <class CharT>
|
|
std::basic_string<CharT>
|
|
get_units(std::ratio<60>)
|
|
{
|
|
return {'m', 'i', 'n'};
|
|
}
|
|
|
|
template <class CharT>
|
|
std::basic_string<CharT>
|
|
get_units(std::ratio<3600>)
|
|
{
|
|
return {'h'};
|
|
}
|
|
|
|
#endif // __cplusplus >= 201402
|
|
|
|
} // namespace detail
|
|
|
|
template <class CharT, class Traits, class Rep, class Period>
|
|
inline
|
|
std::basic_ostream<CharT, Traits>&
|
|
operator<<(std::basic_ostream<CharT, Traits>& os,
|
|
const std::chrono::duration<Rep, Period>& d)
|
|
{
|
|
using namespace std::chrono;
|
|
return os << d.count()
|
|
<< detail::get_units<CharT>(typename Period::type{});
|
|
}
|
|
|
|
} // namespace date
|
|
|
|
#endif // CHRONO_IO_H
|