foreach over pointers OR foreach that mutates the iterator

[guest via Digitalmars-d]

On Thursday, 26 January 2017 at 11:32:09 UTC, ZombineDev wrote:
>
> Not sure if this is a bug in isInputRange or foreach, but they 
> should work consistently.

Copy/paste from primitives.d:

template isInputRange(R)
{
     enum bool isInputRange = is(typeof(
     (inout int = 0)
     {
         R r = R.init;     // can define a range object
         if (r.empty) {}   // can test for empty
         r.popFront;       // can invoke popFront()
         auto h = r.front; // can get the front of the range
     }));
}