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implement octa::mem_fn

master
Daniel Kolesa 2015-04-18 17:19:45 +01:00
parent f549d876e4
commit cc4113459a
1 changed files with 42 additions and 0 deletions
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42
octa/utility.h
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@ -91,6 +91,48 @@ namespace octa {
}
template<typename T> typename internal::AddRvalueReference<T>::type declval();
namespace internal {
template<typename, typename> struct MemTypes;
template<typename T, typename R, typename ...A>
struct MemTypes<T, R(A...)> {
typedef R result;
typedef T argument;
};
template<typename T, typename R, typename A>
struct MemTypes<T, R(A)> {
typedef R result;
typedef T argument;
typedef T first;
typedef A second;
};
template<typename T, typename R, typename ...A>
struct MemTypes<T, R(A...) const>: MemTypes<T, R(A...)> {};
template<typename R, typename T>
class MemFn {
R T::*p_ptr;
public:
struct type: MemTypes<T, R> {};
MemFn(R T::*ptr): p_ptr(ptr) {}
template<typename... A>
auto operator()(T &obj, A &&...args) ->
decltype(((obj).*(p_ptr))(args...)) {
return ((obj).*(p_ptr))(args...);
}
template<typename... A>
auto operator()(const T &obj, A &&...args) ->
decltype(((obj).*(p_ptr))(args...)) const {
return ((obj).*(p_ptr))(args...);
}
};
}
template<typename R, typename T>
internal::MemFn<R, T> mem_fn(R T:: *ptr) {
return internal::MemFn<R, T>(ptr);
}
}
#endif