Throwing exception in constructor

[Vijay Nayar]

On Tue, 16 Aug 2011 19:08:53 +0200, Stijn Herreman wrote:

> Why is the return statement required, while nothing after the Exception
> is executed?
> Error: one path skips constructor
> 
> 	public this(string p1, string p2, string p3) {
> 		string json = download_string(...);
> 		
> 		if (json is null)
> 		{
> 			throw new Exception("404");
> 			writeln("test");
> 			return;
> 		}
> 		else
> 		{
> 			this(json);
> 		}
> 	}
> 	
> 	package this(string json)
> 	{
> 		...
> 	}

What compiler are you using?  Using DMD2 (DMD32 D Compiler v2.054), I 
have no problem with the example below.  I suspect the problem may not 
have anything to do with return statements.

import std.stdio;
import std.conv;

class Hambo {
    public int _value;

    public this(string value) {
        this(to!int(value));
    }

    public this(int value) {
        if (value < 10) {
            throw new Exception("Not high enough.");
        } else {
            _value = value;
        }
    }
}

void main() {
    // Throws: object.Exception at constructor.d(13): Not high enough.
    //Hambo ham1 = new Hambo("4");
    Hambo ham2 = new Hambo("14");
    writeln(ham2._value);
}