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// This is reserved space for an absl::Mutex to guard flag data. It will be
// initialized in FlagImpl::Init via placement new.
// We can't use "absl::Mutex data_guard_", since this class is not literal.
// We do not want to use "absl::Mutex* data_guard_", since this would require
// heap allocation during initialization, which is both slows program startup
// and can fail. Using reserved space + placement new allows us to avoid both
// problems.
alignas(absl::Mutex) mutable char data_guard_[sizeof(absl::Mutex)];
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