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[VSoRC/.git] / node_modules / node-pty / node_modules / nan / doc / scopes.md

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-## Scopes
-
-A _local handle_ is a pointer to an object. All V8 objects are accessed using handles, they are necessary because of the way the V8 garbage collector works.
-
-A handle scope can be thought of as a container for any number of handles. When you've finished with your handles, instead of deleting each one individually you can simply delete their scope.
-
-The creation of `HandleScope` objects is different across the supported versions of V8. Therefore, NAN provides its own implementations that can be used safely across these.
-
- - <a href="#api_nan_handle_scope"><b><code>Nan::HandleScope</code></b></a>
- - <a href="#api_nan_escapable_handle_scope"><b><code>Nan::EscapableHandleScope</code></b></a>
-
-Also see the V8 Embedders Guide section on [Handles and Garbage Collection](https://github.com/v8/v8/wiki/Embedder%27s%20Guide#handles-and-garbage-collection).
-
-<a name="api_nan_handle_scope"></a>
-### Nan::HandleScope
-
-A simple wrapper around [`v8::HandleScope`](https://v8docs.nodesource.com/node-8.11/d3/d95/classv8_1_1_handle_scope.html).
-
-Definition:
-
-```c++
-class Nan::HandleScope {
- public:
-  Nan::HandleScope();
-  static int NumberOfHandles();
-};
-```
-
-Allocate a new `Nan::HandleScope` whenever you are creating new V8 JavaScript objects. Note that an implicit `HandleScope` is created for you on JavaScript-accessible methods so you do not need to insert one yourself.
-
-Example:
-
-```c++
-// new object is created, it needs a new scope:
-void Pointless() {
-  Nan::HandleScope scope;
-  v8::Local<v8::Object> obj = Nan::New<v8::Object>();
-}
-
-// JavaScript-accessible method already has a HandleScope
-NAN_METHOD(Pointless2) {
-  v8::Local<v8::Object> obj = Nan::New<v8::Object>();
-}
-```
-
-<a name="api_nan_escapable_handle_scope"></a>
-### Nan::EscapableHandleScope
-
-Similar to [`Nan::HandleScope`](#api_nan_handle_scope) but should be used in cases where a function needs to return a V8 JavaScript type that has been created within it.
-
-Definition:
-
-```c++
-class Nan::EscapableHandleScope {
- public:
-  Nan::EscapableHandleScope();
-  static int NumberOfHandles();
-  template<typename T> v8::Local<T> Escape(v8::Local<T> value);
-}
-```
-
-Use `Escape(value)` to return the object.
-
-Example:
-
-```c++
-v8::Local<v8::Object> EmptyObj() {
-  Nan::EscapableHandleScope scope;
-  v8::Local<v8::Object> obj = Nan::New<v8::Object>();
-  return scope.Escape(obj);
-}
-```
-