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

[aliak via Digitalmars-d-learn]

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!