Macro [stack_array](@ref stack_array) hides an instance of Variable-length Automatic Array and instead exposes managing object of type [raw_ptr_array](@ref cgm::raw_ptr_array). If compiler does not support VLAA, then dynamic memory allocation is used.
TEST (StackArray, Iterators) {
int sz{10};
stack_array(int, sz, a);
a[0] = 0; a[1] = 1; a[2] = a[1];
std::fill(a.begin(), a.end(), 3);
std::iota(a.begin(), a.end(), -4);
int sum{0};
for (auto elem : a) {
sum += elem;
}
ASSERT_EQ(sum, std::accumulate(a.begin(), a.end(), 0));
} for (auto i : num::range(5)) { // [0,5) = 0, 1, 2, 3, 4; the same as range(0, 5)
for (auto i : num::range(5, 16, 3)) { // 5, 8, 11, 14; with step
for (auto f : num::range(5.1, 8.3, 0.6)) { // with floating-point numbers
for (auto i : num::range(16, 5, -3)) { // 16, 13, 10, 7; reversed