CODEWITHSUNDEEP
c++classc++11static-assert
Vincent
Vincent

Reputation: 60441

Static assert to check static const class data members?

I have several classes with "static const" data members. I would like to know how to check their values at compile time with static_assert. Can I put static_assert directly in the class body ? (Putting my static_assert in every constructor is not very practical.)

Upvotes: 5

Views: 981

Answers (1)

Marc Mutz - mmutz
Marc Mutz - mmutz

Reputation: 25313

Yes, static_assert() can be placed everywhere a declaration can, too. That includes the body of a class:

class C {
public:
    enum E {
      A, B, C,
      NumEes
    };
    constexpr Foo foos[] = { {...}, {...}, {...} };
    static_assert( NumEes == sizeof foos / sizeof *foos, "size mismatch" );

    // ...
};

Upvotes: 4

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