prune

auto a = Array!int([10,20,30,40,50]);

/* Iterate over an Array. If `remove` is set inside the loop body, the
 current element is removed from the array. This is more efficient than
 multiple calls to the `.remove()` method. */
foreach(i, ref x, ref bool rem; prune(a))
{
	if(x == 30)
		x = 31;
	rem = (i == 1) || (x == 40);
}

assert(equal(a[], [10,31,50]));

/** same, but without indices */
foreach(ref x, ref bool rem; prune(a))
{
	if(x == 10)
		x = 11;
	rem = (x == 50);
}

assert(equal(a[], [11,31]));