When to opCall instead of opIndex and opSlice?

[Jacob Carlborg]

On 2017-10-02 17:57, Nordlöw wrote:
> Is implementing opCall(size_t) for structures such as array containers 
> that already define opIndex and opSlice deprecated?
> 
> I can't find any documentation on the subject on when opCall should be 
> defined to enable foreach (isIterable).

opCall is not related to foreach. It's used to overload the call 
operator, i.e. ().

struct Foo
{
     void opCall() {};
}

Foo foo;
foo();

Are you thinking of opApply [1]?

[1] https://dlang.org/spec/statement.html#foreach_over_struct_and_classes

-- 
/Jacob Carlborg