www.digitalmars.com         C & C++   DMDScript  

digitalmars.D.learn - Do property attributes not allow postincrement operators

reply Jamie <notme gmail.com> writes:
Do  property attributes not allow postincrement operators?

import std.stdio;

struct Foo {
      property bar() { return 10; }
      property bar(int x) { writeln(x); }
}

void main()
{
     Foo foo;
     writeln(foo.bar); // actually calls foo.bar();
     foo.bar = 10; // calls foo.bar(10);

     // following doesn't work
     foo.bar++; // would expect this to call foo.bar(foo.bar() + 
1);
     // have to use:
     foo.bar = foo.bar + 1;
     writeln(foo.bar);
}
Apr 13
parent reply Mike Franklin <slavo5150 yahoo.com> writes:
On Sunday, 14 April 2019 at 01:54:39 UTC, Jamie wrote:
 Do  property attributes not allow postincrement operators?

 import std.stdio;

 struct Foo {
      property bar() { return 10; }
      property bar(int x) { writeln(x); }
 }

 void main()
 {
     Foo foo;
     writeln(foo.bar); // actually calls foo.bar();
     foo.bar = 10; // calls foo.bar(10);

     // following doesn't work
     foo.bar++; // would expect this to call foo.bar(foo.bar() + 
 1);
     // have to use:
     foo.bar = foo.bar + 1;
     writeln(foo.bar);
 }
It's a long standing issue (going on 7 years old) https://issues.dlang.org/show_bug.cgi?id=8006 There's an implementation at https://github.com/dlang/dmd/pull/7079 It requires a DIP, which you can find at https://github.com/dlang/DIPs/pull/97 However, in preparing that DIP other issues were discovered with property, so we need to create a DIP to fix those issues first. I plan on getting to it, but there are other pressing things I'm trying to get out of the way. Mike
Apr 13
parent Jamie <notme gmail.com> writes:
On Sunday, 14 April 2019 at 02:11:52 UTC, Mike Franklin wrote:
 On Sunday, 14 April 2019 at 01:54:39 UTC, Jamie wrote:
 Do  property attributes not allow postincrement operators?
 ...
It's a long standing issue (going on 7 years old) ... I plan on getting to it, but there are other pressing things I'm trying to get out of the way. Mike
Thanks Mike -- appears I didn't do a thorough enough search for this behaviour. Looking forward to it being implemented, cheers.
Apr 13