JS::AutoIdArray 编辑
This article covers features introduced in SpiderMonkey 17
Take ownership of a JSIdArray and free it later.
Syntax
AutoIdArray(JSContext *cx, JSIdArray *ida);
| Name | Type | Description |
|---|---|---|
cx | JSContext * | The context in which to add the root. Requires request. In a JS_THREADSAFE build, the caller must be in a request on this JSContext. |
ida | JSIdArray * | A pointer to JSIdArray to take the ownership. |
Methods
| Method | Description |
|---|---|
bool operator!() const | Return true if this has no owned array. |
jsid operator[](size_t i) const | Return a jsid in specified index of the owned array. |
size_t length() const | Return the length of the owned array. |
JSIdArray *steal() | Return the owned array and release the ownership. |
Description
JS::AutoIdArray takes the ownership of JSIdArray, and frees it in destructor by calling JS_DestroyIdArray.
Examples
{
JS::AutoIdArray ids(cx, JS_Enumerate(cx, obj));
if (!ids) // Check the returned value from JS_Enumerate
return false;
for (int32_t i = 0, len = ids.length(); i < len; i++) {
someFunc(cx, ids[i]);
}
/* when leaving this scope, the JSIdArray returned by JS_Enumerate is freed. */
}
See Also
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