How to resolve the algorithm Respond to an unknown method call step by step in the D programming language

Published on 12 May 2024 09:40 PM
#D

How to resolve the algorithm Respond to an unknown method call step by step in the D programming language

Table of Contents

Problem Statement

Demonstrate how to make the object respond (sensibly/usefully) to an invocation of a method on it that it does not support through its class definitions. Note that this is not the same as just invoking a defined method whose name is given dynamically; the method named at the point of invocation must not be defined. This task is intended only for object systems that use a dynamic dispatch mechanism without static checking.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Respond to an unknown method call step by step in the D programming language

Source code in the d programming language

import std.stdio;

struct Catcher {
    void foo() { writeln("This is foo"); }

    void bar() { writeln("This is bar"); }

    void opDispatch(string name, ArgsTypes...)(ArgsTypes args) {
        writef("Tried to handle unknown method '%s'", name);
        if (ArgsTypes.length) {
            write(", with arguments: ");
            foreach (arg; args)
                write(arg, " ");
        }
        writeln();
    }
}

void main() {
    Catcher ca;
    ca.foo();
    ca.bar();
    ca.grill();
    ca.ding("dong", 11);
}

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