Re: [Boost-users] [boost::function] Retrieving function objects / Determining function type

14 Jul 2008

      AMDG

Ruediger Berlich wrote:
...
is it possible to get direct access to a function object encapsulated in
boost::function ?
If you know that type of the function object, you can use target.
...
And is it possible to determine whether boost::function
has indeed stored a function object rather than, say, a function pointer ?
You can get the typeid of the type that a boost::function contains
using the function target_type.

#include <iostream>
#include 

void f() {
    std::cout << "Calling f" << std::endl;
}

int main() {
    boost::function func = &f;
    if(func.target_type() == typeid(void(*)())) {
        func();
    }
    if(void(**target)() = func.target()) {
        (*target)();
    }
}

In Christ,
Steven Watanabe