On Thursday, 12 September 2013 at 20:07:40 UTC, Jonathan M Davis
wrote:
On Thursday, September 12, 2013 12:42:34 H. S. Teoh wrote:
On Thu, Sep 12, 2013 at 09:12:18PM +0200, bearophile wrote:
> H. S. Teoh:
> >In phobos git HEAD, std.format has been made pure @safe
> >nothrow (and
> >
> >CTFE-able), so you should be able to write your assert as:
> > assert(condition, format("x = %s, blahblah", x));
>
> With the latest DMD from updated GIT head:
>
>
> import std.string: format;
> void main() pure nothrow {
>
> string x = "hello";
> bool condition = true;
> assert(condition, format("x = %s, blahblah", x));
>
> }
>
>
> It gives:
>
> test.d(5): Error: 'std.string.format!(char, string).format'
> is not nothrow
> test.d(2): Error: function 'D main' is nothrow yet may throw
[...]
Oops. Apparently I wrote nothrow but forgot to test it. I did
test pure
and @safe, though, so at least those two should work.
format can't be nothrow, because it throws when you screw up
the format
specifiers. You have to wrap it in a try-catch block and
assert(0) in the catch
block if you want to put it in a nothrow function. std.datetime
does this in
at least a few places.
- Jonathan M Davis
Why don't we have a format function that is statically checked?
