65 lines
2.0 KiB
C++
65 lines
2.0 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 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 General Public License for more details.
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You should have received a copy of the GNU 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_STRING_APPENDER_HPP
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#define REXY_STRING_APPENDER_HPP
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#include "../expression.hpp"
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#include "../traits.hpp"
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#include <utility> //forward
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namespace rexy::detail{
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template<class Targ>
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struct string_appender
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{
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private:
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Targ& m_targ;
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public:
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constexpr string_appender(Targ& t)noexcept:
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m_targ(t){}
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template<class L, class R>
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constexpr void operator()(const binary_expression<L,R>& expr)
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noexcept(noexcept((*this)(expr.left())) && noexcept((*this)(expr.right())))
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{
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(*this)(expr.left());
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(*this)(expr.right());
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}
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template<class L>
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constexpr void operator()(const unary_expression<L>& expr)
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noexcept(noexcept((*this)(expr.left())))
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{
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(*this)(expr.left());
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}
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template<class Val, std::enable_if_t<!rexy::is_template_derived_type<Val,binary_expression>::value,int> = 0, class = decltype(std::declval<Val>().length())>
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constexpr void operator()(Val&& v)
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{
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m_targ.append(std::forward<Val>(v).get(), std::forward<Val>(v).length());
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}
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template<class Val, std::enable_if_t<!rexy::is_template_derived_type<Val,binary_expression>::value,void*> = nullptr, class = decltype(std::declval<Val>().size())>
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constexpr void operator()(Val&& v)
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{
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m_targ.append(std::forward<Val>(v).get(), std::forward<Val>(v).size());
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}
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};
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}
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#endif
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