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# Standard library header <cstdbool>

From cppreference.com
< cpp‎ | header

This header was originally in the C standard library as `<stdbool.h>`.

Compatibility header, in C defines true, false and bool which are keywords in C++.

__bool_true_false_are_defined (C++11) | C compatibility macro constant, expands to integer constant 1 (macro constant)

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