On Saturday, 30 September 2017 at 09:27:23 UTC, Shigeki Karita
wrote:
https://dpaste.dzfl.pl/cd605899d050
why this code cannot convert to foreach (over Structs and
Classes with Ranges).
auto h = new BinaryHeap!(int[])(new int[0]);
typeof(h).stringof.writeln;
static assert(isInputRange!(typeof(h)));
h.insert(3);
h.insert(1);
h.insert(2);
// Error: invalid foreach aggregate `h`
// foreach (e; h) e.writeln;
for (; !h.empty; h.popFront()) {
auto e = h.front();
e.writeln;
}
https://dlang.org/spec/statement.html#foreach-with-ranges
The reason why it doesn't work is much more simple than you
think: h is not a BinaryHeap, it's a pointer to.
Try "foreach (e; *h) e.writeln;" and it works.
