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              <cstdbool> (stdbool.h)

              Boolean type
              The purpose in C of this header is to add a bool type and the true and false values as macro definitions.

              In C++, which supports those directly, the header simply contains a macro that can be used to check if the type is supported:

              Macro constants

              Macrodescriptiondefined as
              __bool_true_false_are_definedSpecifies whether bool, true and false are defined1