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Type of FD_ISSET happens to be bool in C++

While SUS mandates FD_ISSET to have return type int (in C, which is all SUS is concerned with), the definition 


#define __FD_ISSET(d, set) \
  ((__FDS_BITS (set)[__FD_ELT (d)] & __FD_MASK (d)) != 0)
in bits/select.h causes it to have type bool instead in C++. Is that by design or by accident?
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