54 lines
2.3 KiB
C++
54 lines
2.3 KiB
C++
/*------------------------------------------------------------------------------*
|
|
* Architecture & Implementation of DBMS *
|
|
*------------------------------------------------------------------------------*
|
|
* Copyright 2022 Databases and Information Systems Group TU Dortmund *
|
|
* Visit us at *
|
|
* http://dbis.cs.tu-dortmund.de/cms/en/home/ *
|
|
* *
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
|
|
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL *
|
|
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR *
|
|
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, *
|
|
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR *
|
|
* OTHER DEALINGS IN THE SOFTWARE. *
|
|
* *
|
|
* Authors: *
|
|
* Maximilian Berens <maximilian.berens@tu-dortmund.de> *
|
|
* Roland Kühn <roland.kuehn@cs.tu-dortmund.de> *
|
|
* Jan Mühlig <jan.muehlig@tu-dortmund.de> *
|
|
*------------------------------------------------------------------------------*
|
|
*/
|
|
|
|
#pragma once
|
|
#include "operator_interface.h"
|
|
#include <memory>
|
|
|
|
namespace beedb::execution
|
|
{
|
|
/**
|
|
* Interface for operators providing a single child.
|
|
*/
|
|
class UnaryOperator : public OperatorInterface
|
|
{
|
|
public:
|
|
explicit UnaryOperator(concurrency::Transaction *transaction) : OperatorInterface(transaction)
|
|
{
|
|
}
|
|
|
|
~UnaryOperator() override = default;
|
|
|
|
void child(std::unique_ptr<OperatorInterface> &&child)
|
|
{
|
|
_child = std::move(child);
|
|
}
|
|
|
|
[[nodiscard]] const std::unique_ptr<OperatorInterface> &child() const
|
|
{
|
|
return _child;
|
|
}
|
|
|
|
private:
|
|
std::unique_ptr<OperatorInterface> _child;
|
|
};
|
|
} // namespace beedb::execution
|