I try to learn D by doing stl-like templates. Anyway I have some little problems.

1. I noticed that there is not yet (opApply?) assignment operator, or is there?.

2. Should opCmp work like c's strcmp?

3.
i = a[3..4];	// same as i = a.opSlice(3,4);
But is there operator for this one:
a[3..4]=i; // same as a.opSliceAssing(i,3,4); ???

On Tue, 31 May 2005 11:44:39 +0000 (UTC), Ant^2i wrote:

> I try to learn D by doing stl-like templates. Anyway I have some little problems.
> 
> 1. I noticed that there is not yet (opApply?) assignment operator, or is there?.

What symbol would be the 'Apply' one? Are you thinking that the '=' (assignment) operator might be overloaded by opApply?

> 2. Should opCmp work like c's strcmp?

In so far as it is supposed to return  '< 0' if the first parameter is less than the second parameter, zero if they are equal value, and '> 0' if the first is greater than the second.

> 3.
> i = a[3..4];	// same as i = a.opSlice(3,4);
> But is there operator for this one:
> a[3..4]=i; // same as a.opSliceAssing(i,3,4); ???

I don't think so.

-- 
Derek Parnell
Melbourne, Australia
31/05/2005 10:51:53 PM

"Ant^2i" <Ant^2i_member@pathlink.com> wrote in message news:d7hin7$1i3h$1@digitaldaemon.com...
>I try to learn D by doing stl-like templates. Anyway I have some little
> problems.
>
> 1. I noticed that there is not yet (opApply?) assignment operator, or is there?.

It would be called opAssign, the equivalent of operator=() in C++, and no, it can't be overridden.  You see, Walter doesn't like implicit casts.

On Tue, 31 May 2005 18:29:53 -0400, Jarrett Billingsley wrote:

> "Ant^2i" <Ant^2i_member@pathlink.com> wrote in message news:d7hin7$1i3h$1@digitaldaemon.com...
>>I try to learn D by doing stl-like templates. Anyway I have some little
>> problems.
>>
>> 1. I noticed that there is not yet (opApply?) assignment operator, or is there?.
> 
> It would be called opAssign, the equivalent of operator=() in C++, and no, it can't be overridden.  You see, Walter doesn't like implicit casts.

Except the ones he's built into the language ;-)

-- 
Derek
Melbourne, Australia
1/06/2005 9:28:03 AM

Ant^2i wrote:
> I try to learn D by doing stl-like templates. Anyway I have some little
> problems.
> 
> 1. I noticed that there is not yet (opApply?) assignment operator, or is there?.

opApply is used to support foreach on a container class.

Of course there's an assignment operator.  Just no means of overloading it.  Partly because Walter doesn't like the idea and partly because the way D works means that it isn't really necessary.

http://www.digitalmars.com/d/faq.html#assignmentoverloading

> 2. Should opCmp work like c's strcmp?

Yes.

> 3. i = a[3..4];	// same as i = a.opSlice(3,4);
> But is there operator for this one:
> a[3..4]=i; // same as a.opSliceAssing(i,3,4); ???

No.  Slice assignment isn't currently supported, but when we eventually have it, it should be opSliceAssign.

Stewart.

-- 
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