175. Template

Question.7

A developer validates template parameters at compile time:

template<typename T, int Size>
class Buffer {
   static_assert(Size > 0, "Buffer size must be positive");
   static_assert(sizeof(T) <= 4, "Element too large");
   T data[Size];
};

Buffer<double, 10> buf;  // sizeof(double) = 8

Will this compile?

Need Help? Refer to the Quick Guide below

Yes -- static_assert is just a warning
No -- sizeof(double) is 8, which exceeds the 4-byte limit; static_assert fires with the error message
Yes -- static_assert does not apply to template parameters
No -- but only because double cannot be used in arrays

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