forked from mpusz/mp-units
71 lines
2.2 KiB
C++
71 lines
2.2 KiB
C++
// The MIT License (MIT)
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//
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// Copyright (c) 2018 Mateusz Pusz
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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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#pragma once
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#include <units/bits/downcasting.h>
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#include <units/bits/fixed_string.h>
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#include <units/ratio.h>
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namespace units {
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struct prefix_type {};
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template<typename T>
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concept PrefixType = std::derived_from<T, prefix_type>;
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namespace detail {
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template<PrefixType PT, Ratio R>
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struct prefix_base : downcast_base<prefix_base<PT, R>> {
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using prefix_type = PT;
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using ratio = R;
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};
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}
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template<typename Child, PrefixType PT, Ratio R, basic_fixed_string Symbol>
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struct prefix : downcast_child<Child, detail::prefix_base<PT, R>> {
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static constexpr auto symbol = Symbol;
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};
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// TODO gcc:92150
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// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92150
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// namespace detail {
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// template<typename T>
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// inline constexpr bool is_prefix = false;
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// template<typename PrefixType, Ratio R, basic_fixed_string Symbol>
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// inline constexpr bool is_prefix<prefix<PrefixType, R, Symbol>> = true;
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// } // namespace detail
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template<typename T>
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// concept Prefix = detail::is_prefix<T>;
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concept Prefix = true;
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struct no_prefix : prefix_type {};
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} // namespace units
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