On Wednesday, 25 October 2017 at 22:19:23 UTC, Walter Bright
wrote:
for core D devs.
"How Non-Member Functions Improve Encapsulation" by Scott Meyers
http://www.drdobbs.com/cpp/how-non-member-functions-improve-encapsu/184401197
You mean non-member functions are preferred? I encountered this
more from performance point: especially in case of small
structures like Point it would be more beneficial to pass them by
value than by reference, which can be achieved by extension
methods, but then you need to import the respective module to
have those extension methods available. It would work more
palatable if extension methods from the structure's module were
available without requiring import. It may rely on static
declarations inside the struct like C# does it:
struct Size
{
int width,height;
alias add=.add; //?
}
Size add(Size s1, Size s2)
{
return Size(s1.width+s2.width, s1.height+s2.height);
}
or just work without it. Such alias would allow to provide
extension methods from other modules, though this would mean
circular dependency between modules.
