lambda_as_function.h

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/*
 * Copyright © 2018 Canonical Ltd.
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 or 3 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Authored by: Alan Griffiths <alan@octopull.co.uk>
 */
 
#ifndef MIRAL_LAMBDA_AS_FUNCTION_H
#define MIRAL_LAMBDA_AS_FUNCTION_H
 
#include <functional>
 
namespace miral
{
namespace detail
{
template <class F> struct FunctionType;
 
template<typename Lambda, typename Return, typename... Arg>
struct FunctionType<Return (Lambda::*)(Arg...)> { using type = std::function<Return(Arg...)>; };
 
template<typename Lambda, typename Return, typename... Arg>
struct FunctionType<Return (Lambda::*)(Arg...) const> { using type = std::function<Return(Arg...)>; };
}
 
template<typename Lambda>
auto lambda_as_function(Lambda&& lambda) -> typename detail::FunctionType<decltype(&Lambda::operator())>::type
{
    return typename detail::FunctionType<decltype(&Lambda::operator())>::type(std::forward<Lambda>(lambda));
}
}
 
#endif //MIRAL_LAMBDA_AS_FUNCTION_H