Re: [Boost-users] boost::function/boost::bind compilation error

On Sun, Sep 6, 2009 at 1:23 AM, Ahmed Badran wrote:

Hi,

I was trying to use boost function/bind to bind the first argument of a member function that takes two arguments, when I got into a compilation error that I can't quite decipher or understand, below is a sample representation of the problem, and then there's the compilation error, am I doing something incorrectly here?

I have tried removing the boost::mem_fn instantiation with no difference.

#include #include #include #include <iostream>

using namespace std; using namespace boost;

class my_class {        public:        void test(bool b)        {                cout << "got " << b << endl;        }        private: };

int main() {        my_class c;        boost::function1 test_fn;        boost::bind(&my_class::test, &c, _2);

       /* causes a compilation error */        test_fn = boost::bind<void>(boost::mem_fn(&my_class::test), &c, _2);

Don't need the mem_fn here - and the _2 should be _1 as well, as you've declared test_fn with 1 parameter, so use this: test_fn = boost::bind(&my_class::test, &c, _1);

       /* works fine */        test_fn = bind1st(mem_fun(&my_class::test), &c);

       test_fn(true);        test_fn(false);        return 0; }

<snip>

Regards, Ahmed

Stuart Dootson