Created
November 29, 2014 16:55
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Fn, FnMut, FnOnce hierarchy in C++
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template<typename Return, typename... Arguments> | |
struct FnOnce | |
{ | |
using This = FnOnce<Return, Arguments...>; | |
virtual Return operator ()(Arguments&&...) && = 0; | |
}; | |
template<typename Return, typename... Arguments> | |
struct FnMut: FnOnce<Return, Arguments...> | |
{ | |
using This = FnMut<Return, Arguments...>; | |
virtual Return operator ()(Arguments&&...) & = 0; | |
Return operator ()(Arguments&&... arguments) && final override | |
{ | |
return ((This&)(*this))(std::forward<Arguments>(arguments)...); | |
} | |
}; | |
template<typename Return, typename... Arguments> | |
struct Fn: FnMut<Return, Arguments...> | |
{ | |
using This = Fn<Return, Arguments...>; | |
virtual Return operator ()(Arguments&&...) const & = 0; | |
Return operator ()(Arguments&&... arguments) & final override | |
{ | |
return ((This const&)(*this))(std::forward<Arguments>(arguments)...); | |
} | |
}; |
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