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Function object.Object.opEquals
Test whether this
is equal to o
.
The default implementation only compares by identity (using the is
operator).
Generally, overrides and overloads for opEquals
should attempt to compare objects by their contents.
A class will most likely want to add an overload that takes your specific type as the argument
and does the content comparison. Then you can override this and forward it to your specific
typed overload with a cast. Remember to check for null
on the typed overload.
Examples
class Child {
int contents;
// the typed overload first. It can use all the attribute you want
bool opEquals(const Child c) const @safe pure nothrow @nogc
{
if (c is null)
return false;
return this .contents == c .contents;
}
// and now the generic override forwards with a cast
override bool opEquals(Object o)
{
return this .opEquals(cast(Child) o);
}
}
Authors
Walter Bright, Sean Kelly
License
Copyright © 1999-2024 by the D Language Foundation | Page generated by ddox.