On 21.09.2016 21:01, Timon Gehr wrote:
On 21.09.2016 19:57, HaraldZealot wrote:
So if someone has real rationale not to have operator overloading as
external function I'm curios to arguments.
There is no technical reason that would make the implementation of this
feature difficult, if that is your question.
Basically, the rationale is: external operators cannot be used in
generic code that does not import the module defining the operators. C++
works around this using ADL. Walter (justifiably) does not like ADL,
hence the limitation.
(I don't agree with that line of reasoning: obviously this is not only
an issue for operators, but for any UFCS function; operators are mere
BTW, another argument in favour of free function operators is opOpAssign