Re: [Boost-users] [boost::function] problem with void type as argument type

On Mon, 2007-03-26 at 20:31 +0200, Seweryn Habdank-Wojewódzki wrote:

Hi!

I have small piece of code and I do not know why it is not compiling - proper instantiation of function is not created.

It means, why boost::function can not deduct types (code below).

The problem is when type U is void. Can any one help me with it?

Regards.

template < typename T, typename U > void test ( boost::function & f ); [snip] boost::function h = &f3; boost::function i = &f4;

The problem is that "int(void)" is just an alternative spelling for "int()", i.e., a function type for a function that takes no parameters but returns an "int". A function type int() cannot match a template parameter T(U), because there is nothing to match the "U". Cheers, Doug