Re: Creating unary function by binding-2nd to class member

Alf P. Steinbach wrote:


I was writing it from my head.
But I assume it was disrespectful to post non-working code..

Here's the more proper one:

#include <iostream>
#include <vector>
#include <algorithm>
#include <functional>

struct Node {
    int val;
    int index;
};

struct A
{
    std::vector<Node*> Nodes;

    A() {};

    bool EqIndex(const Node* ptr, int idx) const
    {
        return (ptr->index == idx);
    };

    int foo()
    {
        std::find_if(Nodes.begin(), Nodes.end(),
std::bind2nd(&A::EqIndex, 5));
        return 0;
    };
};

int main(int argc, char* argv[])
{
    A a;
    a.foo();

    return 0;
}

The problem is in the std::find_if(...bind2nd...).
My guess is that it assumes that given type is only class/struct.

I've also tried to use std::mem_fun - no effect.
Do I have to write a functor to use such functionality?