• via Digitalmars-d-bugs (71/71) Mar 03 2015 https://issues.dlang.org/show_bug.cgi?id=14243

via Digitalmars-d-bugs <digitalmars-d-bugs puremagic.com> writes:

https://issues.dlang.org/show_bug.cgi?id=14243

          Issue ID: 14243
           Summary: mixin template scope inconsistency?
           Product: D
           Version: D2
          Hardware: x86
                OS: Mac OS X
            Status: NEW
          Severity: blocker
          Priority: P1
         Component: DMD
          Assignee: nobody puremagic.com
          Reporter: timothee.cour2 gmail.com

[reposted from EMAIL:mixin template scope inconsistency? in
digitalmars-d-learn puremagic.com]

Template mixin scope seems to have a weird behavior:
I don't understand 'WEIRD(1)' and 'WEIRD(2)' below.

import std.stdio;
struct A{
  int b;
  this(int b){
    this.b=b;
    writeln("A.begin");
  }
  ~this(){
    writeln("A.end");
  }
}

mixin template Entry(){
  auto a=A(12);
}

void test1(){
  writeln("test.begin");
  mixin Entry;
  writeln(a.b);//WEIRD! destructor has been called but a.b is still alive
  writeln("test.end");
}

void test2(){
  writeln("test.begin");
  auto a=A(0);
  writeln("test.end");
}

void test3(){
  writeln("test.begin");
  mixin("auto a=A(0);");
  writeln("test.end");
}

void main(){
  test1;
  writeln;
  test2;
  writeln;
  test3;
}

output:
----------------
test.begin
A.begin
A.end //WEIRD(1): why is destructor called before test.end?
12 //WEIRD(2): destructor has been called but a.b is still alive
test.end

test.begin
A.begin
test.end
A.end

test.begin
A.begin
test.end
A.end
----------------

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