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Standard library header <cstdbool>

From cppreference.com
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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++.

Macros

__bool_true_false_are_defined
(C++11)(deprecated in C++17)
C compatibility macro constant, expands to integer literal 1
(macro constant) [edit]

[edit] Notes

This header is deprecated in C++17 and removed in C++20. Corresponding <stdbool.h> is still available in C++20.