79 lines
2.3 KiB
C++
79 lines
2.3 KiB
C++
/**
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This file is a part of rexy's general purpose library
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Copyright (C) 2020 rexy712
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef REXY_DETAIL_UTIL_HPP
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#define REXY_DETAIL_UTIL_HPP
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#include <cstddef> //size_t
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namespace rexy::detail{
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namespace{
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//including <algorithm> causes long compile times. so just make my own max instead
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template<class T>
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constexpr const T& max(const T& a, const T& b){
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return (a < b) ? b : a;
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}
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template<class T>
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constexpr const T& min(const T& a, const T& b){
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return (a > b) ? b : a;
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}
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constexpr size_t cx_strlen(const char* c){
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size_t i = 0;
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for(;c[i];++i);
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return i;
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}
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constexpr int cx_strcmp(const char* l, const char* r){
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using uchar = unsigned char;
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for(;*l == *r && *l;++l, ++r);
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return (uchar{*l}) - (uchar{*r});
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}
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} //anonymous namespace
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} //namespace detail
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//std::swap and std::exchange aren't constexpr until c++20
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#if __cplusplus > 201703L
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#include <utility>
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#define rexy_cx_swap(...) std::swap(__VA_ARGS__)
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#define rexy_cx_exchange(...) std::exchange(__VA_ARGS__)
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#else
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#include <type_traits>
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namespace rexy::detail{
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namespace{
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template<class T>
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constexpr void cx_swap(T& a, T& b)noexcept(std::is_nothrow_move_constructible<T>::value &&
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std::is_nothrow_move_assignable<T>::value)
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{
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T tmp = std::move(a);
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a = std::move(b);
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b = std::move(tmp);
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}
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template<class T, class U = T>
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constexpr T cx_exchange(T& t, U&& u){
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T old = std::move(t);
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t = std::forward<U>(u);
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return old;
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}
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}
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} //namespace detail
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#define rexy_cx_swap(...) detail::cx_swap(__VA_ARGS__)
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#define rexy_cx_exchange(...) detail::cx_exchange(__VA_ARGS__)
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#endif
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#endif
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