What is a trait class?
Simple meaning
A template that carries type information or constants for algorithms.
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A template that carries type information or constants for algorithms.
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Called when exception handling fails, like throw from destructor during unwind.
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It waits and returns the value or rethrows stored exception.
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optional is value-based and clearer for returned absence.
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Deep recursion or huge stack arrays.
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It reinterprets object representation safely for certain types.
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C library error codes after failing calls.
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A joining thread that requests stop on destruction via stop_token.
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It returns a view into a portion without copying.
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Compile-time branching discarded for false branches.
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Calling fclose or special free functions automatically.
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Indirect calls hinder inlining.
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A reusable sync point where threads wait until all arrive.
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A lazy view of elements matching a predicate.
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Knowing if stack unwinding is in progress so destructors can avoid throwing.
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It captures file, line, and function for logging without macros.
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A compiler cache for identical translations.
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reserve capacity without changing size
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It limits concurrent access with a count.
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It calls callables uniformly including pointers to members.
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