caosdb/result_set.h

namespace caosdb

namespace transaction

Creation and execution of transactions.

Author

Timm Fitschen

Date

2021-08-05

class ResultSet

#include <result_set.h>

Abstract base class for the results of a Transaction.

Subclassed by caosdb::transaction::AbstractMultiResultSet

Public Functions

virtual ~ResultSet() = default

virtual auto size() const noexcept -> int = 0

virtual auto at(const int index) const -> const Entity& = 0

virtual auto mutable_at(int index) const -> Entity* = 0

virtual auto release_at(int index) -> Entity* = 0

Return the Entity at the given index.

This method releases the entity from the underlying collection and thus leaves the ResultSet in a corrupted state.

This method can be called only once for each index.

auto begin() const -> iterator

auto end() const -> iterator

class iterator : public std::iterator<std::output_iterator_tag, Entity>

Public Functions

explicit iterator(const ResultSet *result_set, int index = 0)

auto operator*() const -> const Entity&

auto operator++() -> iterator&

auto operator++(int) -> iterator

auto operator!=(const iterator &rhs) const -> bool

Private Members

int current_index = 0

const ResultSet *result_set

class AbstractMultiResultSet : public caosdb::transaction::ResultSet

Subclassed by caosdb::transaction::MultiResultSet

Public Functions

inline AbstractMultiResultSet(const AbstractMultiResultSet &original)

Copy Constructor.

Copies the underlying collection of entities.

virtual ~AbstractMultiResultSet() = default

inline explicit AbstractMultiResultSet(std::vector<std::unique_ptr<Entity>> result_set)

inline virtual auto size() const noexcept -> int override

inline virtual auto at(const int index) const -> const Entity& override

inline virtual auto mutable_at(int index) const -> Entity* override

inline virtual auto release_at(int index) -> Entity* override

Return the Entity at the given index.

This method releases the entity from the underlying collection and thus leaves the ResultSet in a corrupted state.

This method can be called only once for each index.

inline auto clear() noexcept -> void

Remove all entities from this result set.

Protected Attributes

std::vector<std::unique_ptr<Entity>> items

class MultiResultSet : public caosdb::transaction::AbstractMultiResultSet

#include <result_set.h>

Container with results of a transaction.

Public Functions

~MultiResultSet() = default

explicit MultiResultSet(std::vector<std::unique_ptr<Entity>> result_set)