Function IsSpace

tests/gtest/gtest.h:2229–2231

  return islower(static_cast<unsigned char>(ch)) != 0;
}
inline bool IsSpace(char ch) {
  return isspace(static_cast<unsigned char>(ch)) != 0;
}
inline bool IsUpper(char ch) {
  return isupper(static_cast<unsigned char>(ch)) != 0;
}