Call-ie return on behalf of caller?

[ketmar via Digitalmars-d-learn]

On Thu, 04 Jun 2015 01:07:10 +0000, Tofu Ninja wrote:

> On Thursday, 4 June 2015 at 01:01:08 UTC, ketmar wrote:
>> On Wed, 03 Jun 2015 22:37:52 +0000, Tofu Ninja wrote:
>>
>>> I don't want to have to put try catch blocks every time I call the
>>> caller.
>>
>> write mixin template for that. ;-)
> 
> Except mixin templates can only be used for declarations...

you can cheat a compiler (warning! don't try that at home!):

  mixin template callit(alias fn) {
    private auto tmp () {
      try fn(); catch (Exception) {}
      return 0;
    }
    private auto tmpv = tmp();
  }

  void test (string s) {
    import std.stdio;
    writeln(s);
  }

  void main () {
    mixin callit!(() => test("wow"));
    mixin callit!(() => test("hey"));
  }


but actually, simple template will do the work too:

  template callit(alias fn, A...) {
    void callit (A args) {
      try fn(args); catch (Exception) {}
    }
  }

  void test (string s) {
    import std.stdio;
    writeln(s);
  }

  void main () {
    callit!test("wow");
    callit!test("hey");
  }
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