#include <metal_stdlib> using namespace metal; template<typename T, size_t N> struct tint_array { const constant T& operator[](size_t i) const constant { return elements[i]; } device T& operator[](size_t i) device { return elements[i]; } const device T& operator[](size_t i) const device { return elements[i]; } thread T& operator[](size_t i) thread { return elements[i]; } const thread T& operator[](size_t i) const thread { return elements[i]; } threadgroup T& operator[](size_t i) threadgroup { return elements[i]; } const threadgroup T& operator[](size_t i) const threadgroup { return elements[i]; } T elements[N]; }; struct S { tint_array<int, 4> arr; }; void foo() { tint_array<int, 4> const src = tint_array<int, 4>{}; tint_array<int, 4> dst = {}; S dst_struct = {}; tint_array<tint_array<int, 4>, 2> dst_array = {}; dst_struct.arr = src; dst_array[1] = src; dst = src; dst_struct.arr = src; dst_array[0] = src; }