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# bnns_graph_context_t

An object that wraps a compiled graph object.

```
struct bnns_graph_context_t
```

## Overview

The [`bnns_graph_context_t`](/documentation/Accelerate/bnns_graph_context_t) object wraps a [`bnns_graph_t`](/documentation/Accelerate/bnns_graph_t) instance and adds mutable data storage. BNNS requires mutability to support dynamic shapes and other execution objects.

You must ensure that the underlying [`bnns_graph_t`](/documentation/Accelerate/bnns_graph_t) instance remains valid throughout the lifetime of the context.

## Topics

### Initializing a context

[`init()`](/documentation/Accelerate/bnns_graph_context_t/init())

Creates an empty graph context structure.

[`init(data:size:)`](/documentation/Accelerate/bnns_graph_context_t/init(data:size:))

Creates a graph context structure from the specified opaque graph context object.

### Specifying a context’s properties

[`data`](/documentation/Accelerate/bnns_graph_context_t/data)

A pointer to the opaque graph context object.

[`size`](/documentation/Accelerate/bnns_graph_context_t/size)

The size, in bytes, of the opaque graph context object.


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