70. static_assert

Question.3

A circular buffer requires a power-of-two size for bitmask wrapping. A developer validates this:

constexpr int BUF_SIZE = 64;
static_assert((BUF_SIZE & (BUF_SIZE-1)) == 0, "Buffer must be power of 2");

A colleague changes BUF_SIZE to 100. What happens?

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Compiles -- the buffer adjusts automatically
Compilation error: Buffer must be power of 2 -- the bitmask optimization would silently corrupt buffer indices
Runtime assertion failure
Warning that can be ignored

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