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66 lines
1.8 KiB
66 lines
1.8 KiB
4 years ago
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# HandleScope
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The HandleScope class is used to manage the lifetime of object handles
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which are created through the use of node-addon-api. These handles
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keep an object alive in the heap in order to ensure that the objects
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are not collected while native code is using them.
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A handle may be created when any new node-addon-api Value or one
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of its subclasses is created or returned. For more details refer to
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the section titled [Object lifetime management](object_lifetime_management.md).
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## Methods
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### Constructor
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Creates a new handle scope on the stack.
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```cpp
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Napi::HandleScope::HandleScope(Napi::Env env);
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```
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- `[in] env`: The environment in which to construct the `Napi::HandleScope` object.
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Returns a new `Napi::HandleScope`
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### Constructor
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Creates a new handle scope on the stack.
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```cpp
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Napi::HandleScope::HandleScope(Napi::Env env, Napi::HandleScope scope);
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```
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- `[in] env`: `Napi::Env` in which the scope passed in was created.
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- `[in] scope`: pre-existing `Napi::HandleScope`.
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Returns a new `Napi::HandleScope` instance which wraps the napi_handle_scope
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handle passed in. This can be used to mix usage of the C N-API
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and node-addon-api.
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operator HandleScope::napi_handle_scope
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```cpp
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operator Napi::HandleScope::napi_handle_scope() const
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```
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Returns the N-API napi_handle_scope wrapped by the `Napi::EscapableHandleScope` object.
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This can be used to mix usage of the C N-API and node-addon-api by allowing
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the class to be used be converted to a napi_handle_scope.
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### Destructor
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```cpp
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Napi::HandleScope::~HandleScope();
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```
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Deletes the `Napi::HandleScope` instance and allows any objects/handles created
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in the scope to be collected by the garbage collector. There is no
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guarantee as to when the gargbage collector will do this.
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### Env
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```cpp
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Napi::Env Napi::HandleScope::Env() const;
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```
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Returns the `Napi::Env` associated with the `Napi::HandleScope`.
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