types/NullCoercibilityCheckMacro.hpp

/**
 *   Copyright 2015 Pivotal Software, Inc.
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 **/

#ifndef QUICKSTEP_TYPES_NULL_COERCIBILITY_CHECK_MACRO_HPP_
#define QUICKSTEP_TYPES_NULL_COERCIBILITY_CHECK_MACRO_HPP_

#include "types/Type.hpp"
#include "types/TypeID.hpp"

/** \addtogroup Types
 *  @{
 */

/**
 * @brief A code-snippet for use in implementations of Type::isCoercibleFrom()
 *        and Type::isSafelyCoercibleFrom() that does common checks for
 *        nullability of types.
 **/
#define QUICKSTEP_NULL_COERCIBILITY_CHECK()               \
  do {                                                    \
    if (original_type.isNullable() && !nullable_) {       \
      return false;                                       \
    } else if (original_type.getTypeID() == kNullType) {  \
      return true;                                        \
    }                                                     \
  } while (false)

/** @} */

#endif  // QUICKSTEP_TYPES_NULL_COERCIBILITY_CHECK_MACRO_HPP_