Boost.Bind can indeed be used to decrease the number of args a function can take, but it can't be used to increase the number of args a function can take. In the example I gave in my original post, the callback: bool callback(int,int,bool,int); and you have a functon bool draw(int,int) You can't use bind to assign "draw" to "callback". args_cast can be used though. - ali ----- Original Message ----- From: "me22" <me22.ca@gmail.com> Newsgroups: gmane.comp.lib.boost.devel Sent: Friday, December 08, 2006 6:30 PM Subject: Re: new utility: function parameter caster
On 12/7/06, ali f <k9eks@hotmail.com> wrote:
a) wrap the function in a struct and overload operator () b) change the signature (but then change all places where you've invoked the function already)
c) Use Boost.Bind.
From http://boost.org/libs/bind/bind.html#with_functions : bind(f, _2, _1)(x, y); // f(y, x) bind(g, _1, 9, _1)(x); // g(x, 9, x) bind(g, _3, _3, _3)(x, y, z); // g(z, z, z) bind(g, _1, _1, _1)(x, y, z); // g(x, x, x) Note that, in the last example, the function object produced by bind(g, _1, _1, _1) does not contain references to any arguments beyond the first, but it can still be used with more than one argument. Any extra arguments are silently ignored, just like the first and the second argument are ignored in the third example.
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