[Issue 3433] [tdpl] Comparing structs for equality is not member-by-member

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=3433


David Simcha <dsimcha at yahoo.com> changed:

           What    |Removed                     |Added
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                 CC|                            |dsimcha at yahoo.com


--- Comment #2 from David Simcha <dsimcha at yahoo.com> 2009-10-21 08:47:16 PDT ---
Not sure if bitwise comparison should or shouldn't be the default, this is
subjective.  However, I'd say this could be solved, along with several similar
problems, by a function in a new Phobos module called std.mixin:

// Disclaimer:  Quick and dirty, not tested.
enum equalsByOpEquals = q{
    bool opEquals(typeof(this) rhs) {
        foreach(tupleIndex, elem; this.tupleof) {
            if(rhs.tupleof[tupleIndex] != elem) {
                return false;
            }
        }
        return true;
    }
}

Usage:

struct MyStruct {
    mixin(equalsByOpEquals);

    // Other stuff.
}

We could also define a bunch of other stuff like a generic comparison operator
for when you only need some arbitrary total ordering for binary searches, etc.
and don't particularly care what that ordering is.

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