types/NumericSuperType.hpp

/**
 *   Copyright 2011-2015 Quickstep Technologies LLC.
 *   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_NUMERIC_SUPER_TYPE_HPP_
#define QUICKSTEP_TYPES_NUMERIC_SUPER_TYPE_HPP_

#include <cstddef>

#include "types/NullCoercibilityCheckMacro.hpp"
#include "types/Type.hpp"
#include "types/TypeID.hpp"
#include "types/TypedValue.hpp"
#include "utility/Macros.hpp"

namespace quickstep {

/** \addtogroup Types
 *  @{
 */

/**
 * @brief Templatized superclass for Numeric types. Contains code common to all
 *        Numeric types.
 **/
template <typename CppType>
class NumericSuperType : public Type {
 public:
  typedef CppType cpptype;

  std::size_t estimateAverageByteLength() const override {
    return sizeof(CppType);
  }

  bool isCoercibleFrom(const Type &original_type) const override {
    QUICKSTEP_NULL_COERCIBILITY_CHECK();
    return (original_type.getSuperTypeID() == kNumeric);
  }

  TypedValue makeZeroValue() const override {
    return TypedValue(static_cast<CppType>(0));
  }

 protected:
  NumericSuperType(const TypeID type_id, const bool nullable)
      : Type(Type::kNumeric, type_id, nullable, sizeof(CppType), sizeof(CppType)) {
  }

 private:
  DISALLOW_COPY_AND_ASSIGN(NumericSuperType);
};

/** @} */

}  // namespace quickstep

#endif  // QUICKSTEP_TYPES_NUMERIC_SUPER_TYPE_HPP_