Templates in classes => what is wrong?

[Ali Çehreli]

On 04/16/2012 11:48 AM, Xan wrote:
> On Sunday, 15 April 2012 at 19:30:27 UTC, Ali Çehreli wrote:
>> On 04/15/2012 11:39 AM, Xan wrote:
>> > On Sunday, 15 April 2012 at 11:23:37 UTC, John Chapman wrote:
>> >> On Sunday, 15 April 2012 at 11:16:43 UTC, Xan wrote:
>> >>>
>> >>> int main(string [] args)
>> >>> {
>> >>> auto alg = Algorisme!(int,int);
>> >>
>> >> Should be:
>> >> auto alg = new Algorisme!(int, int);
>> >>
>> >>> alg.nom = "Doblar";
>> >>> alg.versio = 1;
>> >>> alg.funcio = (int a) {return 2*a};
>> >>
>> >> Should be:
>> >> alg.funcio = (int a) { return 2 * a; };
>> >> or:
>> >> alg.funcio = a => 2 * a;
>> >>
>> >>> }
>> >
>> >
>> > It does not work:
>> >
>> > $ gdmd-4.6 algorisme.d
>> > algorisme.d:18: Error: variable algorisme.main.alg voids have
>> no value
>> > algorisme.d:18: Error: expression class Algorisme is void and
>> has no value
>> >
>> > with the code https://gist.github.com/2394274
>> >
>> > What fails now?
>> >
>> > Thanks,
>> > Xan.
>>
>> Your code is still missing 'new':
>>
>> auto alg = new Algorisme!(int, int);
>
> With only this change, I receive this error:
>
> $ gdmd-4.6 algorisme.d
> algorisme.d:21: Error: cannot implicitly convert expression
> (__dgliteral1) of type int delegate(int a) pure nothrow to int
> function(int)
>
>>
>> Unrelated recommendations:
>>
>> - Return 0 from main() for successful exit, anything else by
>> convention means some sort of error.
>>
>> - Take advantage of constructors (and 'alias') to simplify syntax and
>> risk of bugs:
>>
>> import std.conv, std.stdio, std.stream, std.string;
>> import std.socket, std.socketstream;
>> import std.datetime;
>>
>> class Algorisme(U,V) {
>> string nom;
>> uint versio;
>> alias V function (U) Funcio;
>> Funcio funcio;
>>
>> this(string nom, uint versio, Funcio funcio)
>> {
>> this.nom = nom;
>> this.versio = versio;
>> this.funcio = funcio;
>> }
>> }
>>
>> int main(string [] args)
>> {
>> alias Algorisme!(int, int) MeuAlgorism;
>> auto alg = new MeuAlgorism("Doblar", 1,
>> (int a) { return 2 * a; });
>>
>> return 0;
>> }
>>
>> Ali
>
> With all of your suggestion [https://gist.github.com/2394274], I get:
>
> $ gdmd-4.6 algorisme.d
> algorisme.d:30: Error: constructor
> algorisme.Algorisme!(int,int).Algorisme.this (string nom, uint versio,
> int function(int) funcio) is not callable using argument types
> (string,int,int delegate(int a) pure nothrow)
> algorisme.d:30: Error: cannot implicitly convert expression
> (__dgliteral1) of type int delegate(int a) pure nothrow to int
> function(int)
> algorisme.d:27: Error: function D main has no return statement, but is
> expected to return a value of type int
>
>
> What fails?

Sorry to hear that it is still broken. I've only now realized that you 
are using gdmd. Your code works with dmd 2.059 with just one fix:

Make the return type of main() void:

void main(string [] args)

>
> PS: Thanks for your recommendations...
> PPS: By the other hand, I see you have learned catalan ("MeuAlgorisme"?)
> ;-)

Google Translate helped me there. :)

Ali