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I want to use an array-literal of literals in a _Static_assert, but I get a compiler error saying this is not a constant expression

_Static_assert((int[]){2, 1, 0}[2], "err");

Is there a way to make it work?

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  • 9
    Array subscripting involves pointer arithmetic and dereferencing and cannot be used as such. What are you trying to accomplish by doing that? Commented Sep 10, 2023 at 0:53
  • 1
    The value is array object is not a compilation time constant. So it cannot be used in _Static_assert. The C23 will introduce constexpr and allow it for storage specifier of compound literal what may make your code work. Commented Sep 10, 2023 at 8:42
  • @tstanisl when that becomes available, how would I write it? like this: _Static_assert((constexpr int[]){2, 1, 0}[2], "err"); ? Commented Sep 10, 2023 at 8:57
  • Maybe, currently clang seams to support it but it does not work yet :/ Commented Sep 10, 2023 at 10:39
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