google protocol-buffers c++ repeated 链表结构释放内存空间

最新推荐文章于 2024-07-18 00:38:53 发布

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本文介绍了如何管理和操作Protobuf消息格式中Repeated类型的Bar字段。包括获取元素数量、访问特定索引处的元素、获取可修改的指针、添加新元素及释放内存等方法。

Given the message type:

message Bar {}

For this field definitions:

repeated Bar foo = 1;

The compiler will generate the following accessor methods:

int foo_size() const: Returns the number of elements currently in the field.
const Bar& foo(int index) const: Returns the element at the given zero-based index.
Bar* mutable_foo(int index): Returns a mutable pointer to the Bar object that stores the value of the element at the given zero-based index. The pointer is invalidated by a call to Clear() or clear_foo(), or by manipulating the underlying RepeatedPtrField in a way that would remove this element.
Bar* add_foo(): Adds a new element and returns a pointer to it. The returned Bar will have none of its fields set (i.e. it will be identical to a newly-allocated Bar). The pointer is invalidated by a call to Clear() or clear_foo(), or by manipulating the underlying RepeatedPtrField in a way that would remove this element.
void clear_foo(): Removes all elements from the field. After calling this, foo_size() will return zero.
const RepeatedPtrField<Bar>& foo() const: Returns the underlying RepeatedPtrField that stores the field's elements. This container class provides STL-like iterators and other methods.
RepeatedPtrField<Bar>* mutable_foo(): Returns a mutable pointer to the underlying RepeatedPtrField that stores the field's elements. This container class provides STL-like iterators and other methods.