From: Korcan Hussein Sent: 20 February 2008 15:06 To: boost@lists.boost.org Subject: [boost] [bind] recursively binding higher-order functional objects fails to compile.
Sorry about the poor title, it is difficult for me to explain the problem without code so here is a really simple example of what i'm trying to achieve but fails to compile with Boost.Bind:
#include <boost/bind.hpp>
struct FunFn {
typedef void result_type; template < typename Fun > void operator()(Fun fn) const { fn(); }
} const Fn;
void g() { std::cout << "hello\n"; }
int main() { using namespace boost;
bind(Fn, bind(Fn, bind(Fn, bind(Fn, ... bind(Fn, g))();
Clearly: bind(Fn,g)(); works. What about: bind(Fn, bind(Fn, g))(); If that works, how many binds can you add before it stops working?
}
I get type deduction errors,
You may have run into a compiler limit. What compiler are you using?
however i have found workaround using Boost.Function for the time being:
#include <boost/function.hpp>
... boost::function< void () > fnN = bind(Fn, g), fnN-1 = bind(Fn, fnN), ..., fn1 = bind(Fn, fn2), fn = bind(Fn, fn1);
bind(Fn, fn)();
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