On Wednesday, 10 August 2016 at 20:35:23 UTC, Dicebot wrote:
The first DIP has just landed into the new queue. It is a (...)
The wording is unclear in the section "Implicit Conversion of
Function Pointers and Delegates".
It says "scope can be added to parameters, but not removed."
The trouble is that the word "added" can be understood in two
opposite ways.
When you assign an address to a pointer variable, you can say
that:
- you are assigning a new runtime value, so you are adding scope
of parameter of the right hand side to the otherwise unscoped
parameter of the left hand side, e.g.
alias T function(T) fp_t;
T bar(scope T);
fp_t fp = &bar; // Ok
- you are converting to a new variable, so you are adding scope
of param of the left hand side to an otherwise unscoped param of
the right hand side, e.g.
alias T function(scope T) fps_t;
T foo(T);
fps_t fp = &foo; // Error
Half-jokingly, I think its good to recognize that there is an
ambiguity before multiple authors implement things with different
assumptions and have a month-long discussion on github. :)
More seriously, this wording may make its way to documentation
after the design is implemented.
If wording is fixed, I suggest also checking if all examples are
correct.
