[Boost-users] Re: boost bind question, can it create a functor with more arguments than needed

gast 128 wrote:

Dear all,

Probably this is something one does not encounter often, but I have here an interface which expects more arguments than needed, e.g.:

void SomeInterface(boost::function<void (Arg1, Arg2)> fcCallback) {}

now I have another functor like: boost::function<void (Arg1)> fc;

I want fc apply to SomeInterface, and it only needs to fill in argument1.

So I need something like boost::bind(fc, _1, _2) to get it compilable for SomeInterface, only bind now thinks that fc has a prototype of two arguments. Is there a way to tell bind to ignore argument2 (without explicit write a functor)?

I believe the result of bind(fc, _1) would happily accept two arguments, discarding the second. As an extreme example: void do_nothing() {} int r; bind(do_nothing)(r, r, r, r, r, r); works fine. - Volodya