C faults, etc

[BCS]

Reply to bearophile,

> writefln, writeln and the things of Tango are nice and cute and safe,
> but if I have to save 250 MB of numbers (or 1 GB of them, or even
> more) then performance is important, and those cute functions are
> 2-3-5 times slower than printf. This means printf can save me minutes
> of running time. So I use printf. But if I use printf in C and I
> write:
> 
> int main() {
> float f = 1.2345;
> printf("%d\n", f);
> return 0;
> }
> The compiler says me:
> warning: format '%d' expects type 'int', but argument 2 has type
> 'double'
> While DMD compiles it silently. Better to quickly add such
> warning/error to D compilers too.


It would be interesting to write a template that takes a static format string 
(using writef syntax) and, based on its argument tuple to generates a trivial 
wrapper around printf with a guarantied correct (printf syntax) format string.