Re: [boost] [type_traits] type_traits for types with operator().

On 29 January 2014 17:28, John Maddock wrote:

A better C++11 style interface *if* it can be implemented would be something like:

template struct is_callable;

Which inherits from true_type only if F is callable with arguments Args...

The tricky part is creating a decent interface that can deal with both lvalue and rvalue refs as arguments correctly.

Actually I was sure there was something similar in the C++11 std, but I couldn't find anything.

It doesn't exist, but all std::lib implementations need something like it, so it would be a good candidate for standardisation. The traits in http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n3866.html provide even more functionality. is_callable::value would be true iff raw_invocation_type