static_assert(size, str) causing an error

[sivansh11]

public struct node_t {
    aabb_t aabb;
    uint32_t is_leaf : 1;
    uint32_t primitive_count : 31;
    uint32_t first_primitive_index_or_first_child_index : FIRST_INDEX_BITS_SIZE;
    uint32_t children_count: 4;    // do not use
};
static_assert(sizeof(node_t) == 32, "sizeof(node_t) is not 32");

the static_assert line casues an error

error 20001: unexpected '(', expected ')'
static_assert(sizeof(node_t) == 32, "sizeof(node_t) is not 32");
                    ^

I believe this is a bug ?

on commit 5d8cf47

[csyonghe]

sizeof isn't a supported operator in Slang.

This is because without specifying a layout, the size of a type is not defined. A struct can have different sizes depending on where it is used/how it is laid out. For example the std140 and std430 layouts would have lead to different answers of sizeof(T).

For this reason, static assert checks like you provided is not possible today.

We can add support for things like sizeof(T, std430) to return a size under a specified layout, but this feature would need to come at a later time.

[sivansh11]

We can add support for things like sizeof(T, std430) to return a size under a specified layout, but this feature would need to come at a later time.
yes please that would be nice, should I open a new issue as a feature request or will this issue do ?

[csyonghe]

Please open a separate issue so it is clear what to do.