Apparently std.string.format() is not implemented / does not compile! :(
Is there any sort of replacement?
Something which works like writefln() but output a string!

Lloyd Dupon:

> Apparently std.string.format() is not implemented / does not compile! :(

This works for me, DMD 2.053:

import std.stdio, std.string;

void main() {
    int x = 10;
    auto s = format("%d", 10);
    writeln(">", s, "<");
}


Bye,
bearophile

mm... ok.
but why the line below doesn't compile?

mixin(format("class %s {}", "A"));



"bearophile"  wrote in message news:it2pf5$1qh6$1@digitalmars.com... 
> Apparently std.string.format() is not implemented / does not compile! :(
This works for me, DMD 2.053:

On 6/12/11 6:37 PM, Lloyd Dupont wrote:
> mm... ok.
> but why the line below doesn't compile?
>
> mixin(format("class %s {}", "A"));

Because format presumably can't be interpreted at compile time (yet) – not all functions are necessarily CTFEable.

David

On 2011-06-12 10:30, David Nadlinger wrote:
> On 6/12/11 6:37 PM, Lloyd Dupont wrote:
> > mm... ok.
> > but why the line below doesn't compile?
> > 
> > mixin(format("class %s {}", "A"));
> 
> Because format presumably can't be interpreted at compile time (yet) – not all functions are necessarily CTFEable.

Yeah. format can only be used at runtime. If you want a version which works at compile time, then you std.metastrings.Format, which is an eponymous template. e.g.

mixin(Format!("class %s {}", "A"));

should work. Of course, in this particular case, you might as well just give the whole string to the mixin directly, but I assume that the example is so simple simply because it's an example.

- Jonathan M Davis

Den 12-06-2011 18:37, Lloyd Dupont skrev:
> mm... ok.
> but why the line below doesn't compile?
>
> mixin(format("class %s {}", "A"));

Because the mixin is evaluated at compile time. This means that format(...) is evaluated at compile time which afaik is not supported.

It may be supported in the future with the improved CTFE that is being worked on.

/Jonas

yep, the example is simple because it is an example!
Thanks for your suggestion! :)

"Jonathan M Davis"  wrote in message news:mailman.850.1307909499.14074.digitalmars-d-learn@puremagic.com...

On 2011-06-12 10:30, David Nadlinger wrote:
> On 6/12/11 6:37 PM, Lloyd Dupont wrote:
> > mm... ok.
> > but why the line below doesn't compile?
> >
> > mixin(format("class %s {}", "A"));
>
> Because format presumably can't be interpreted at compile time (yet) –
> not all functions are necessarily CTFEable.

Yeah. format can only be used at runtime. If you want a version which works at
compile time, then you std.metastrings.Format, which is an eponymous template.
e.g.

mixin(Format!("class %s {}", "A"));

should work. Of course, in this particular case, you might as well just give
the whole string to the mixin directly, but I assume that the example is so
simple simply because it's an example.

- Jonathan M Davis