Re: [Boost-users] return type of boost::bind

From: Duane Murphy (duanemurphy_at_[hidden])
Date: 2004-02-01 13:15:51

The return type of boost::bind is fairly indeterminate. In order to call
a bound function at a later time, look at boost::function. It does a nice
job of holding on to a function that uses boost::bind.

--- At Sun, 1 Feb 2004 08:45:43 -0500, Cheenu Srinivasan wrote:

>I wish to store the return value of boost::bind in an intermediate object
>to invoke it at a later time.  I only ever see examples which combine
>the call to boost:bind with the immediate invocation on the returned
>object such as:
>
>    #include <boost/bind.hpp>
>    using namespace boost;
>    #include <iostream>
>    using namespace std;
>
>    double f(int i, double d) {
>      cout << "int = " << i << endl;
>      return d;
>    }
>
>    main() {
>      int i = 99;
>      cout << bind(f, _1, 1.234)(i) << endl;
>    }
>
>Instead I'd like to postpone the call to the returned object.  What's the 
>type of obj?
>
>  main() {
>    int i = 99;
>    WHAT_IS_MY_TYPE obj = bind(f, _1, 1.234);
>    ...
>    cout << obj(i) << endl;
>}

 ...Duane