Re: property += operator

[Dlang User via Digitalmars-d-learn]

On 5/10/2018 2:50 PM, SrMordred wrote:
On Thursday, 10 May 2018 at 19:41:41 UTC, Dlang User wrote:
On 5/10/2018 1:43 PM, SrMordred wrote:
[...]

I am relatively new to D and I was under the impression that that was 
a limitation of @property functions.

But, re-reading the language reference, it gave this example (it 
returns something from the write property, which seems odd), I 
modified to add refs, and then it seems to work, but I am not sure if 
it is correct or not:

import std.stdio;

struct Foo
{
    @property ref int data() { return m_data; } // read property

    @property ref int data(int value) { return m_data = value; } // 
write property

  private:
    int m_data;
}

void main()
{
    Foo f;
    f.data = 5;
    f.data++;
    f.data+= 2;
    writeln(f.data);

}

this didn´t work either.
note that 'f.data+= 2;' don't call the write property

That's odd, it works on my machine (Windows 10 with V2.079.0 DMD 
compiler).

I changed main to this:

void main()
{
        Foo f;
        writeln(f.data);
        f.data = 5;
        writeln(f.data);
        f.data++;
        writeln(f.data);
        f.data+= 2;
        writeln(f.data);        
}


and then I get this output:

0
5
6
8