• aldanor (15/16) Dec 15 2014 Could someone please explain why the following doesn't compile
• anonymous (9/25) Dec 15 2014 Has nothing to do with mixin. This produces the same error
• aldanor (2/34) Dec 16 2014 Indeed... thanks!

"aldanor" <i.s.smirnov gmail.com> writes:

Could someone please explain why the following doesn't compile 
with "const" qualifier while it does work without it?

/* test.d */

module test;

mixin template Foo() {
     mixin(" property int bar() const { return foo; }");
}

int foo = 1;

mixin Foo;

unittest {
     assert(foo == bar);
}

 rdmd -main -unittest test.d

test.d-mixin-4(4): Error: function test.Foo!().bar without 'this' 
cannot be const
test.d(9): Error: mixin test.Foo!() error instantiating

"anonymous" <anonymous example.com> writes:

On Monday, 15 December 2014 at 23:14:30 UTC, aldanor wrote:
 Could someone please explain why the following doesn't compile 
 with "const" qualifier while it does work without it?

 /* test.d */

 module test;

 mixin template Foo() {
     mixin(" property int bar() const { return foo; }");
 }

 int foo = 1;

 mixin Foo;

 unittest {
     assert(foo == bar);
 }

 rdmd -main -unittest test.d

 test.d-mixin-4(4): Error: function test.Foo!().bar without 
 'this' cannot be const
 test.d(9): Error: mixin test.Foo!() error instantiating

Has nothing to do with mixin. This produces the same error
message:

 property int bar() const { return foo; }
int foo = 1;
unittest {assert(foo == bar);}

The thing is, free functions cannot be const. In a const method,
what's const is `this`. A free function doesn't have `this`, so
it cannot be const.

"aldanor" <i.s.smirnov gmail.com> writes:

On Monday, 15 December 2014 at 23:21:05 UTC, anonymous wrote:
 On Monday, 15 December 2014 at 23:14:30 UTC, aldanor wrote:
 Could someone please explain why the following doesn't compile 
 with "const" qualifier while it does work without it?

 /* test.d */

 module test;

 mixin template Foo() {
    mixin(" property int bar() const { return foo; }");
 }

 int foo = 1;

 mixin Foo;

 unittest {
    assert(foo == bar);
 }

 rdmd -main -unittest test.d

 test.d-mixin-4(4): Error: function test.Foo!().bar without 
 'this' cannot be const
 test.d(9): Error: mixin test.Foo!() error instantiating

 Has nothing to do with mixin. This produces the same error
 message:

  property int bar() const { return foo; }
 int foo = 1;
 unittest {assert(foo == bar);}

 The thing is, free functions cannot be const. In a const method,
 what's const is `this`. A free function doesn't have `this`, so
 it cannot be const.

Indeed... thanks!