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163 lines
3.0 KiB
Markdown
163 lines
3.0 KiB
Markdown
---
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title: "Reference Counted Objects"
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---
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Reference counted objects types.
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Defines the following classes.
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```cpp
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etl::ireference_counter
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```
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The interface of all reference counters.
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---
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```cpp
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etl::reference_counter<TCounter>
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```
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A reference counter using TCounter as the counter.
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---
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```cpp
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etl::reference_counter<void>
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```
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A null reference counter. The reference count always reports as 1.
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---
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```cpp
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etl::ireference_counted_object
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```
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The interface of all reference counted object types.
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---
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```cpp
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etl::reference_counted_object<typename TObject, typename TCounter>
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```
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Derived from `etl::ireference_counted_object`
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---
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```cpp
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etl::atomic_counted_object<typename TObject>
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```
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A template alias of `etl::reference_counted_object<typename TObject, etl::atomic_int32_t>`
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## ireference_counter
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```cpp
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etl::ireference_counter
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```
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The interface of all reference counters.
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```cpp
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virtual ~ireference_counter() {};
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virtual void set_reference_count(int32_t value) = 0;
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virtual void increment_reference_count() = 0;
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ETL_NODISCARD virtual int32_t decrement_reference_count() = 0;
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ETL_NODISCARD virtual int32_t get_reference_count() const = 0;
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```
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## reference_counter
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```cpp
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etl::reference_counter<TCounter>
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```
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A reference counter that uses type TCounter to count.
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---
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```cpp
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etl::reference_counter<void>
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```
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A dummy reference counter that always returns a count of 1.
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Used for persistent objects.
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## ireference_counted_object
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```cpp
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etl::ireference_counted_object<typename TObject, typename TCounter>
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```
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The interface of all reference counted object types.
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---
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```cpp
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virtual ~ireference_counted_object()
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```
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---
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```cpp
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ETL_NODISCARD virtual etl::ireference_counter& get_reference_counter() = 0;
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```
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Get a reference to the reference counter.
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---
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```cpp
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ETL_NODISCARD virtual const etl::ireference_counter& get_reference_counter() const = 0;
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```
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Get a const reference to the reference counter.
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## reference_counted_object
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```cpp
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etl::reference_counted_object<typename TObject, typename TCounter>
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```
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The implementation of a reference counted object.
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---
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```cpp
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reference_counted_object(const TObject& object)
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```
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Constructs from an object.
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The object is copied.
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---
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```cpp
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reference_counted_object()
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```
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Constructs from an onject.
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The object is default constructed.
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---
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```cpp
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ETL_NODISCARD TObject& get_object() ETL_OVERRIDE
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```
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Get a reference to the object.
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---
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```cpp
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ETL_NODISCARD const TObject& get_object() const ETL_OVERRIDE
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```
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Get a const reference to the object.
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---
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```cpp
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ETL_NODISCARD etl::ireference_counter& get_reference_counter() ETL_OVERRIDE
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```
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Get a reference to the reference counter.
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---
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```cpp
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ETL_NODISCARD const etl::ireference_counter& get_reference_counter() const ETL_OVERRIDE
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```
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Get a const reference to the reference counter.
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## For C++11, with atomic support.
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```cpp
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template <typename TObject>
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using atomic_counted_object = etl::reference_counted_object<TObject, etl::atomic_int32_t>;
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```
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**Description**
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Defines an alias to a reference counted object that uses an atomic.
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