Re: Pointers to methods

[nazriel]

On Monday, 4 March 2013 at 03:44:20 UTC, Ali Çehreli wrote:

On 03/03/2013 07:21 PM, nazriel wrote:

> *[1] - code for lazy people :

Thank you very much for doing that. It is the only way to ensure that these threads will remain complete.

Here are two ways depending on what you need:

import std.stdio;

class A
{
    int x;

public:
    this (int y) { x = y; }

    void foo()
    {
        writefln("::foo(), x: %s", x);
    }
};

class B : A
{
public:
    this(int y)
    { super(y); }
};

void main()
{
    {
        auto a = new A(3);
        auto b = new B(4);

// When objects are available up front, initialize the function

        // pointer by an object:
        auto fp = &a.foo;
        fp();
        fp = &b.foo;
        fp();
    }

    {

// When no object is available up front, use a function literal to be

        // called with objects later on:
        auto fp = ((A o) => o.foo());

        auto a = new A(5);
        auto b = new B(6);

        fp(a);
        fp(b);
    }
}

The 2nd one is what I was looking for.
Thanks a lot Ali.