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Compiler Error C2058

  • Grein

constant expression is not integral

The context requires an integer constant expression.

The following sample 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];