Re: 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@constructor.d(13): Not high enough.
    //Hambo ham1 = new Hambo("4");
    Hambo ham2 = new Hambo("14");
    writeln(ham2._value);
}