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 # Class simulation\_framework::core::ITopic

 Last update: 22.04.2026 

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**Definition**: `core/communication/i_topic.h` (line 38)

This is abstraction class of a [Topic](classsimulation__framework_1_1core_1_1Topic.md#classsimulation__framework_1_1core_1_1Topic) and it defines the interfaces based on different type of topic.

**Inherited by**:

- [simulation\_framework::core::Topic< TopicMsgType >](classsimulation__framework_1_1core_1_1Topic.md#classsimulation__framework_1_1core_1_1Topic)

## Members

- [AddPublisher](classsimulation__framework_1_1core_1_1ITopic.md#classsimulation__framework_1_1core_1_1ITopic_1aadab7c49ae9beaa036d3fa9845aed85d)
- [AddSubscriber](classsimulation__framework_1_1core_1_1ITopic.md#classsimulation__framework_1_1core_1_1ITopic_1a612d64a1aca7a60a8efc7f07f4d28311)
- [ClearPubSub](classsimulation__framework_1_1core_1_1ITopic.md#classsimulation__framework_1_1core_1_1ITopic_1a470392793ee8cb2fc406b8b1e1b55d2d)
- [GetId](classsimulation__framework_1_1core_1_1ITopic.md#classsimulation__framework_1_1core_1_1ITopic_1ad4e077cd059e9c6f0ce9ad0df73ca3cd)
- [GetPublishers](classsimulation__framework_1_1core_1_1ITopic.md#classsimulation__framework_1_1core_1_1ITopic_1aa02ef4f55132426e2af9de01bde3bf4b)
- [GetSubscribers](classsimulation__framework_1_1core_1_1ITopic.md#classsimulation__framework_1_1core_1_1ITopic_1a52c9a4a95089eb1dfbc0606974d9a8d0)
- [GetType](classsimulation__framework_1_1core_1_1ITopic.md#classsimulation__framework_1_1core_1_1ITopic_1a461f8684a1e5190affbe69253f74fdb7)
- [PublisherCount](classsimulation__framework_1_1core_1_1ITopic.md#classsimulation__framework_1_1core_1_1ITopic_1a469c0e1f5fd07f9829e93fd8a43bd6f7)
- [SubscriberCount](classsimulation__framework_1_1core_1_1ITopic.md#classsimulation__framework_1_1core_1_1ITopic_1a370ff9b0059ea1c200e6a5384671aac8)
- [~ITopic](classsimulation__framework_1_1core_1_1ITopic.md#classsimulation__framework_1_1core_1_1ITopic_1ac3d4c1cecd1a0c394f8b5a308a0439b5)

## Public functions

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### Function ~ITopic

![](https://img.shields.io/badge/-public-brightgreen "public")

```cpp
virtual simulation_framework::core::ITopic::~ITopic()=default

```

**Return type**:

<a id="classsimulation__framework_1_1core_1_1ITopic_1ad4e077cd059e9c6f0ce9ad0df73ca3cd"></a>

### Function GetId

![](https://img.shields.io/badge/-public-brightgreen "public")![](https://img.shields.io/badge/-const-lightblue "const")

```cpp
virtual TopicId simulation_framework::core::ITopic::GetId() const =0

```

**Returns**:

A unique ID of this topic

**Return type**: TopicId

**Reimplemented by**:

- [GetId](classsimulation__framework_1_1core_1_1Topic.md#classsimulation__framework_1_1core_1_1Topic_1a6cef83adabcaab8aabd20cd3184dca3c)

<a id="classsimulation__framework_1_1core_1_1ITopic_1a461f8684a1e5190affbe69253f74fdb7"></a>

### Function GetType

![](https://img.shields.io/badge/-public-brightgreen "public")![](https://img.shields.io/badge/-const-lightblue "const")

```cpp
virtual TopicType simulation_framework::core::ITopic::GetType() const =0

```

**Returns**:

The type of this topic

**Return type**: TopicType

**Reimplemented by**:

- [GetType](classsimulation__framework_1_1core_1_1Topic.md#classsimulation__framework_1_1core_1_1Topic_1a6f459336816bf96dd43d4a827043485d)

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### Function SubscriberCount

![](https://img.shields.io/badge/-public-brightgreen "public")![](https://img.shields.io/badge/-const-lightblue "const")

```cpp
virtual std::size_t simulation_framework::core::ITopic::SubscriberCount() const =0

```

**Returns**:

The number of subscriber which is listening to this topic

**Return type**: std::size\_t

**Reimplemented by**:

- [SubscriberCount](classsimulation__framework_1_1core_1_1Topic.md#classsimulation__framework_1_1core_1_1Topic_1a71ce3df423a48cbc555cf9fb322726df)

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### Function PublisherCount

![](https://img.shields.io/badge/-public-brightgreen "public")![](https://img.shields.io/badge/-const-lightblue "const")

```cpp
virtual std::size_t simulation_framework::core::ITopic::PublisherCount() const =0

```

**Returns**:

The number of publisher which publishes message into this [Topic](classsimulation__framework_1_1core_1_1Topic.md#classsimulation__framework_1_1core_1_1Topic). The max publisher count of a topic is limited to be one.

**Return type**: std::size\_t

**Reimplemented by**:

- [PublisherCount](classsimulation__framework_1_1core_1_1Topic.md#classsimulation__framework_1_1core_1_1Topic_1a9056b30c90efc165ee8559b41e8a9064)

<a id="classsimulation__framework_1_1core_1_1ITopic_1aadab7c49ae9beaa036d3fa9845aed85d"></a>

### Function AddPublisher

![](https://img.shields.io/badge/-public-brightgreen "public")

```cpp
virtual void simulation_framework::core::ITopic::AddPublisher(std::unique_ptr< IPublisher > pub_ptr)=0

```

Add one publisher of this [Topic](classsimulation__framework_1_1core_1_1Topic.md#classsimulation__framework_1_1core_1_1Topic). The max publisher count of a topic is limited to be one.

**Parameters**:

- **pub\_ptr**: The abstraction of publisher interface

**Parameters**:

- std::unique\_ptr&lt; IPublisher &gt; **pub\_ptr**

**Return type**: [void](classsimulation__framework_1_1core_1_1Topic.md#classsimulation__framework_1_1core_1_1Topic)

**Reimplemented by**:

- [AddPublisher](classsimulation__framework_1_1core_1_1Topic.md#classsimulation__framework_1_1core_1_1Topic_1a9a3bdb1cc0fb2b885fbe528903abcb14)

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### Function AddSubscriber

![](https://img.shields.io/badge/-public-brightgreen "public")

```cpp
virtual void simulation_framework::core::ITopic::AddSubscriber(std::unique_ptr< ISubscriber > sub_ptr)=0

```

Add one subscriber to this [Topic](classsimulation__framework_1_1core_1_1Topic.md#classsimulation__framework_1_1core_1_1Topic)

**Parameters**:

- **sub\_ptr**: The abstraction of subscriber interface

**Parameters**:

- std::unique\_ptr&lt; ISubscriber &gt; **sub\_ptr**

**Return type**: [void](classsimulation__framework_1_1core_1_1Topic.md#classsimulation__framework_1_1core_1_1Topic)

**Reimplemented by**:

- [AddSubscriber](classsimulation__framework_1_1core_1_1Topic.md#classsimulation__framework_1_1core_1_1Topic_1a33882d851ffa66f8db5a83813969e48a)

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### Function ClearPubSub

![](https://img.shields.io/badge/-public-brightgreen "public")

```cpp
virtual void simulation_framework::core::ITopic::ClearPubSub()=0

```

Remove all publisher and subscriber which are asociated with this [Topic](classsimulation__framework_1_1core_1_1Topic.md#classsimulation__framework_1_1core_1_1Topic)

**Return type**: [void](classsimulation__framework_1_1core_1_1Topic.md#classsimulation__framework_1_1core_1_1Topic)

**Reimplemented by**:

- [ClearPubSub](classsimulation__framework_1_1core_1_1Topic.md#classsimulation__framework_1_1core_1_1Topic_1ac366c5dd53e4c5770b1a5f40ae2c8956)

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### Function GetSubscribers

![](https://img.shields.io/badge/-public-brightgreen "public")![](https://img.shields.io/badge/-const-lightblue "const")

```cpp
virtual const Subscribers & simulation_framework::core::ITopic::GetSubscribers() const =0

```

**Returns**:

The list of assigned subscriber which are listening to this [Topic](classsimulation__framework_1_1core_1_1Topic.md#classsimulation__framework_1_1core_1_1Topic)

**Return type**: [const](classsimulation__framework_1_1core_1_1Topic.md#classsimulation__framework_1_1core_1_1Topic) Subscribers &amp;

**Reimplemented by**:

- [GetSubscribers](classsimulation__framework_1_1core_1_1Topic.md#classsimulation__framework_1_1core_1_1Topic_1ab0a3ea471d469cf2b0611b6548752298)

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### Function GetPublishers

![](https://img.shields.io/badge/-public-brightgreen "public")![](https://img.shields.io/badge/-const-lightblue "const")

```cpp
virtual const Publishers & simulation_framework::core::ITopic::GetPublishers() const =0

```

**Returns**:

The list of assigned publisher which are publishing message to this [Topic](classsimulation__framework_1_1core_1_1Topic.md#classsimulation__framework_1_1core_1_1Topic)

**Return type**: [const](classsimulation__framework_1_1core_1_1Topic.md#classsimulation__framework_1_1core_1_1Topic) Publishers &amp;

**Reimplemented by**:

- [GetPublishers](classsimulation__framework_1_1core_1_1Topic.md#classsimulation__framework_1_1core_1_1Topic_1ac31691f84f68ad4a3aeda6074739676f)