[Issue 11161] Document the default struct equality comparison and operator overloading

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=11161


Denis Shelomovskij <verylonglogin.reg at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |major


--- Comment #6 from Denis Shelomovskij <verylonglogin.reg at gmail.com> 2013-11-05 11:31:21 MSK ---
(In reply to comment #2)
> 1. Find opEquals method from the type of operands
> 2. If 'alias this' declaration exists, compiler tries to resolve equality
> operation via alias this. -> `t1.value != t2.value` is tested, and succeeds to
> compile.

Just to be clear, currently we have this:
---
struct S
{
    int i, j;
    alias j this;
}

void main()
{
    S s1 = {0}, s2 = {1};
    assert(s1 == s2); // ok, resolved as `s1.j == s2.j`
}
---
And I'm quite sure it must be clearly documented.

Also it should be mentioned one have to add:
---
bool opEquals(in typeof(this) other)
{ return this.tupleof == other.tupleof; }
---
if "old" comparison behavior is needed.

-- 
Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email
------- You are receiving this mail because: -------