mirror of
https://github.com/worldforge/cyphesis
synced 2026-08-13 12:26:04 -04:00
70 lines
1.8 KiB
C++
70 lines
1.8 KiB
C++
/*
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Copyright (C) 2018 Erik Ogenvik
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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 2 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, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef CYPHESIS_VARIANT_H
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#define CYPHESIS_VARIANT_H
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#include <boost/variant.hpp>
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#include <type_traits>
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namespace detail {
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template<typename... Lambdas>
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struct lambda_visitor;
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template<typename Lambda1, typename... Lambdas>
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struct lambda_visitor<Lambda1, Lambdas...>
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: public Lambda1,
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public lambda_visitor<Lambdas...>
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{
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using Lambda1::operator();
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using lambda_visitor<Lambdas...>::operator();
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lambda_visitor(Lambda1 l1, Lambdas... lambdas)
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: Lambda1(l1), lambda_visitor<Lambdas...>(lambdas...)
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{}
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};
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template<typename Lambda1>
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struct lambda_visitor<Lambda1>
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:
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public Lambda1
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{
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using Lambda1::operator();
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lambda_visitor(Lambda1 l1)
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: Lambda1(l1)
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{}
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};
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}
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/**
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* Allows composing a variant from lambdas.
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* @tparam Fs
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* @param fs
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* @return
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*/
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template<class...Fs>
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auto compose(Fs&& ...fs)
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{
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using visitor_type = detail::lambda_visitor<std::decay_t<Fs>...>;
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return visitor_type(std::forward<Fs>(fs)...);
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};
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#endif //CYPHESIS_VARIANT_H
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