View source code
Display the source code in object.d from which this page was generated on github.
Report a bug
If you spot a problem with this page, click here to create a Bugzilla issue.
Improve this page
Quickly fork, edit online, and submit a pull request for this page. Requires a signed-in GitHub account. This works well for small changes. If you'd like to make larger changes you may want to consider using local clone.

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.

bool opEquals (
  Object o


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);


Walter Bright, Sean Kelly


Boost License 1.0.