Foreach/opApply with @nogc

[ketmar via Digitalmars-d-learn]

On Sun, 24 Aug 2014 13:22:49 +0000
Stefan Frijters via Digitalmars-d-learn
<digitalmars-d-learn at puremagic.com> wrote:

@nogc is a part of signature. gc-function can't call @nogc-one. the
same is with calling @system function from @safe one, for example. or
impure function from pure.

so to say, foreach() creates implicit delegate withoit '@nogc'
attribute, that's why compiler complains.

there is currenly no way to specify attributes for such implicit
delegates. this will work, but you'll not be able to call writeln():

  nogc:
  void main() {
     import std.stdio;
     foreach (element; NumberRange(3, 7)) { // line 21
       //write(element, ' '); // this will fail with 
         // @nogc function 'z00.main.__foreachbody1' cannot call
         // non- at nogc function 'std.stdio.write!(int, char).write'
    }
  }

what we need here is something like:

  foreach (element; NumberRange(3, 7) @nogc) { ... }

but alas...
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