Function IsInSet

source/test/gtest/src/gtest-port.cc:725–727

Returns true if and only if ch appears anywhere in str (excluding the terminating '\0' character).

// Returns true if and only if ch appears anywhere in str (excluding the
// terminating '\0' character).
bool IsInSet(char ch, const char* str) {
  return ch != '\0' && strchr(str, ch) != nullptr;
}

// Returns true if and only if ch belongs to the given classification.
// Unlike similar functions in <ctype.h>, these aren't affected by the