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16683345
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2013-05-22T04:13:11.813
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2013-05-22T04:13:11.813
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it appears, <a href="http://en.cppreference.com/w/cpp/types/is_member_function_pointer" rel="nofollow">via this link</a>, that the following implmentation is used for is_member_function_pointer <pre><code>template< class T > struct is_member_function_pointer_helper : std::false_type {}; template< class T, class U> struct is_member_function_pointer_helper<T U::*> : std::is_function<T> {}; template< class T > struct is_member_function_pointer : is_member_function_pointer_helper< typename std::remove_cv<T>::type > {}; </code></pre> So you can determine if something is a member pointer for something of type U using the T U::* and you can determine if T is a function type. I don't know of any syntax for a member function type, only a member function pointer type. I'd have to consult the standard to see if such a type can exist. If it is the case that this does not exist you could implement a wrapper class which added the pointer for you like so. <pre><code>template<class T> struct is_member_function { static const bool value = std::is_member_function_pointer<T*>::value; }; </code></pre> But when I try decltype(some_type::some_member) I get an error saying I can't just use some_type::some_member. a '&' is required The following works for function member pointers <pre><code>std::is_member_function_pointer<decltype(&foo::hello)>::value </code></pre> It seems to me that you can only use member pointers and not just member types. an alternate implementation of the above is_member_function_pointer_helper might look like <pre><code>template<class... Args, class R, class U> struct is_member_function_pointer_helper<R (U::*)(Args...)> : std::true_type {}; </code></pre>
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