Compiler Error C2058

constant expression is not integral

Remarks

The context requires an integer constant expression.

Example

The following example generates C2058:

// C2058.cpp
struct alignas(1.5) S {};   // C2058

int main() {
   int arr[1.5];   // C2058
}

To resolve the issue, use an integer constant expression. For example, int arr[2];