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Function `std.range.primitives.moveBack`

Moves the back of r out and returns it. Leaves r.back in a destroyable state that does not allocate any resources (usually equal to its .init value).


						
				ElementType!R moveBack(R)
				(
				

				  R r
				

				);

Example

struct TestRange
{
    int payload = 5;
    @property bool empty() { return false; }
    @property TestRange save() { return this; }
    @property ref int front() return { return payload; }
    @property ref int back() return { return payload; }
    void popFront() { }
    void popBack() { }
}
static assert(isBidirectionalRange!TestRange);
TestRange r;
auto x = moveBack(r);
writeln(x); // 5

Authors

Andrei Alexandrescu, David Simcha, and Jonathan M Davis. Credit for some of the ideas in building this module goes to Leonardo Maffi.

License

Boost License 1.0.