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Function `std.range.primitives.moveFront`

Moves the front of r out and returns it.


						
				ElementType!R moveFront(R)
				(
				

				  R r
				

				);

If r.front is a struct with a destructor or copy constructor defined, it is reset to its .init value after its value is moved. Otherwise, it is left unchanged.

In either case, r.front is left in a destroyable state that does not allocate any resources.

Example

auto a = [ 1, 2, 3 ];
writeln(moveFront(a)); // 1
writeln(a.length); // 3

// define a perfunctory input range
struct InputRange
{
    enum bool empty = false;
    enum int front = 7;
    void popFront() {}
    int moveFront() { return 43; }
}
InputRange r;
// calls r.moveFront
writeln(moveFront(r)); // 43

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.