Re: Operator overloading

[Xan]

On Thursday, 19 April 2012 at 19:24:40 UTC, Dmitry Olshansky 
wrote:
On 19.04.2012 23:14, Xan wrote:
Hi, I read http://dlang.org/operatoroverloading.html but in my 
code it
does not work. I tried to overload '*' binary operator in my 
class
Algorisme:
[...]
class Algorisme(U,V) {
string nom;
uint versio;
alias V function (U) Funcio;
Funcio funcio;

this(string nom, uint versio, Funcio funcio) {
try {
this.nom = nom;
this.versio = versio;
this.funcio = funcio;
}
catch {
writeln("Error");
}
}

string toString() {
return format("%s (versió %s): %s -> %s", nom, versio, 
typeid(U),
typeid(V));
}

Algorisme(U, V) opBinary(string op) (Algorisme(U, V) alg) {
Algorisme! opBinary(string op) (Algorisme alg) {

or
Algorisme!(U,V) opBinary(string op) (Algorisme!(U,V) alg) {

should do it

static if (op == '*') return new Algorisme("composició",

or:
static if (op == '*') return new Algorisme!(U,v)("composició",

same here. There is no need to put !(params) explicitly if it's 
the same as the template you are writing.

this.versio+alg.versio, this.funcio);
}



Thanks, Dmitry, but it's a correction "*" instead of '*' (string 
instead of char)

The definitive code is:

        Algorisme!(U,V) opBinary(string op)(Algorisme!(U,V) alg) {
		static if (op=="*") return new Algorisme!(U,V)("composició", 
this.versio+alg.versio, this.funcio);
        }


Thanks a lot, another time,
Xan.


}
[...]

but I receive these errors:

$ gdmd-4.6 algorisme.d
algorisme.d:31: function declaration without return type. 
(Note that
constructors are always named 'this')
algorisme.d:31: no identifier for declarator Algorisme(U, V)
algorisme.d:31: semicolon expected following function 
declaration
algorisme.d:31: function declaration without return type. 
(Note that
constructors are always named 'this')
algorisme.d:31: function declaration without return type. 
(Note that
constructors are always named 'this')
algorisme.d:31: found 'alg' when expecting ')'
algorisme.d:31: no identifier for declarator 
opBinary(Algorisme(U, V))
algorisme.d:31: semicolon expected following function 
declaration
algorisme.d:31: Declaration expected, not ')'
algorisme.d:35: unrecognized declaration


Why it fails?
Anyone could help me?

Thanks,
Xan.