Mir
lambda_as_function.h
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1 /*
2  * Copyright © 2018 Canonical Ltd.
3  *
4  * This program is free software: you can redistribute it and/or modify it
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11  * GNU General Public License for more details.
12  *
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14  * along with this program. If not, see <http://www.gnu.org/licenses/>.
15  */
16 
17 #ifndef MIRAL_LAMBDA_AS_FUNCTION_H
18 #define MIRAL_LAMBDA_AS_FUNCTION_H
19 
20 #include <functional>
21 
22 namespace miral
23 {
24 namespace detail
25 {
26 template <class F> struct FunctionType;
27 
28 template<typename Lambda, typename Return, typename... Arg>
29 struct FunctionType<Return (Lambda::*)(Arg...)> { using type = std::function<Return(Arg...)>; };
30 
31 template<typename Lambda, typename Return, typename... Arg>
32 struct FunctionType<Return (Lambda::*)(Arg...) const> { using type = std::function<Return(Arg...)>; };
33 }
34 
35 template<typename Lambda>
36 auto lambda_as_function(Lambda&& lambda) -> typename detail::FunctionType<decltype(&Lambda::operator())>::type
37 {
38  return typename detail::FunctionType<decltype(&Lambda::operator())>::type(std::forward<Lambda>(lambda));
39 }
40 }
41 
42 #endif //MIRAL_LAMBDA_AS_FUNCTION_H

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