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60 lines
2.3 KiB
Markdown
60 lines
2.3 KiB
Markdown
# External (template)
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The `Napi::External` template class implements the ability to create a `Napi::Value` object with arbitrary C++ data. It is the user's responsibility to manage the memory for the arbitrary C++ data.
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`Napi::External` objects can be created with an optional Finalizer function and optional Hint value. The Finalizer function, if specified, is called when your `Napi::External` object is released by Node's garbage collector. It gives your code the opportunity to free any dynamically created data. If you specify a Hint value, it is passed to your Finalizer function.
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## Methods
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### New
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```cpp
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template <typename T>
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static Napi::External Napi::External::New(napi_env env, T* data);
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```
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- `[in] env`: The `napi_env` environment in which to construct the `Napi::External` object.
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- `[in] data`: The arbitrary C++ data to be held by the `Napi::External` object.
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Returns the created `Napi::External<T>` object.
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### New
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```cpp
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template <typename T>
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static Napi::External Napi::External::New(napi_env env,
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T* data,
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Finalizer finalizeCallback);
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```
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- `[in] env`: The `napi_env` environment in which to construct the `Napi::External` object.
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- `[in] data`: The arbitrary C++ data to be held by the `Napi::External` object.
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- `[in] finalizeCallback`: A function called when the `Napi::External` object is released by the garbage collector accepting a T* and returning void.
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Returns the created `Napi::External<T>` object.
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### New
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```cpp
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template <typename T>
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static Napi::External Napi::External::New(napi_env env,
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T* data,
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Finalizer finalizeCallback,
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Hint* finalizeHint);
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```
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- `[in] env`: The `napi_env` environment in which to construct the `Napi::External` object.
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- `[in] data`: The arbitrary C++ data to be held by the `Napi::External` object.
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- `[in] finalizeCallback`: A function called when the `Napi::External` object is released by the garbage collector accepting T* and Hint* parameters and returning void.
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- `[in] finalizeHint`: A hint value passed to the `finalizeCallback` function.
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Returns the created `Napi::External<T>` object.
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### Data
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```cpp
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T* Napi::External::Data() const;
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```
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Returns a pointer to the arbitrary C++ data held by the `Napi::External` object.
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