Method IsOn

Source/cmValue.h:60–63

* Does the value indicate a true or ON value? */

   * Does the value indicate a true or ON value?
   */
  bool IsOn() const noexcept
  {
    return this->Value && cmValue::IsOn(cm::string_view(*this->Value));
  }
  /**
   * Does the value indicate a false or off value ? Note that this is
   * not the same as !IsOn(...) because there are a number of