On Friday, 7 October 2016 at 12:04:09 UTC, Mark wrote:
I'm going over the Object class methods and I have a few
concerns about the opEquals method.
First, what should be the default implementation of opEquals?
The specification (see
https://dlang.org/spec/operatoroverloading.html#eqcmp) reads:
"If opEquals is not specified, the compiler provides a default
version that does member-wise comparison"
But this doesn't appear to be the case (at least with dmd). So
I went and checked the module in
https://github.com/dlang/druntime/blob/master/src/object.d. It
implements opEquals by comparing references (obj1 is obj2), not
by member-wise comparison.
Wouldn't member-wise comparison be a more intuitive default?
For structs it provides memberwise comparison for classes it uses
pointer-identity
