Re: [Boost-users] [boost.bind] How to retrieve the function type of a boost::bind result

Olaf Krzikalla: ...

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template<typename T> void foo(boost::function<T> func) { /*...*/ }

void bar() {}

void baz() { foo(boost::bind(&bar)); // error }

So how do I get the first line of baz to work? That is, is there a generic way to compute the boost::function type from the bind result?

There is not because the boost::function type is not unique. Hmm, indeed. However wouldn't it be possible for the bind (member) function pointer overloads to return a "_bind_t_ex" type derived from _bind_t containing a function_type typedef? In my particular use case I will use bind with function pointers only.

In general you can't deduce a boost::function<> from the result of bind, even if you only use functions. function f1 = bind( bar ); // OK function f2 = bind( bar ); // OK function f3 = bind( bar ); // still OK In fact, this ability to ignore arguments is the primary reason to use bind(bar), if you didn't need it, you could have used just bar.