How do you debug @safe @nogc code? Can't figure out how to print.

[aliak]

On Saturday, 17 November 2018 at 21:56:23 UTC, Neia Neutuladh 
wrote:
> On Sat, 17 Nov 2018 21:16:13 +0000, aliak wrote:
>> Could do. But it's not scalable. I'd have to comment out all 
>> the unittests that call the template function with a T that 
>> allocates inside the @nogc template (if I understood you 
>> correctly that it)
>
> I meant something like:
>
>     void debugln(T...)(T args) @nogc
>     {
>       import std.stdio;
>       debug(MyProject) writeln(args);
>     }
>
> You use that function instead of writeln in your 
> @nogc-compatible templates:
>
>     void callFunc(alias func)()
>     {
>       debugln("about to call function!");
>       func();
>       debugln("done calling function!");
>     }
>
> Then I can write:
>
>     @nogc:
>     void foo() { printf("hello world\n"); }
>     void main() { callFunc!foo(); }

Aha! I misunderstood what you meant. Yes that's actually simpler 
that what I was doing :D Thanks!