On Thursday, 30 November 2017 at 06:36:12 UTC, Ali Çehreli wrote:
import std.range; struct S { int i; bool is_a_copy = false; this(this) { is_a_copy = true; } } void main() { auto r = [S(1)]; auto a = r.front; assert(a.is_a_copy); // yes, a is a copy assert(a.i == 1); // as expected, 1 assert(r.front.i == 1); // front is still 1 auto b = r.moveFront(); assert(!b.is_a_copy); // no, b is not a copy assert(b.i == 1); // state is transferred assert(r.front.i == 0); // front is int.init }
I tested it and it works like you wrote, but the behavior is different for an array of integers...:
auto a = [ 1,2,3 ]; writeln(a.front); // 1 auto b = a.moveFront(); writeln(b); // 1 writeln(a.length); // still 3 writeln(a.front); // still 1 -Johan