Re: Call different member functions on object sequence with a generic handler function?

[Ali Çehreli via Digitalmars-d-learn]

On 06/29/2018 09:44 AM, Robert M. Münch wrote:

So, how can I write a generic handler that does the iteration, where I can specify which member function to call?

Passing a lambda or a string mixin:

import std.stdio;

class C {
    void A() {
        writeln(__FUNCTION__);
    }

    void B() {
        writeln(__FUNCTION__);
    }
}

void handler(alias func)(C[] cs) {
    foreach (c; cs) {
        func(c);
    }
}

void handler_2(string func)(C[] cs) {
    foreach (c; cs) {
        enum expr = "c." ~ func ~ "();";
        mixin(expr);
    }
}

void main() {
    auto cs = [ new C(), new C() ];

    handler!(o => o.A())(cs);
    handler!(o => o.B())(cs);

    handler_2!"A"(cs);
    handler_2!"B"(cs);
}

Ali