boost :: ptr_vector如何深度复制基础对象? [英] How does boost::ptr_vector deep copy the underlying objects?

问题描述

ptr_vector 是可复制构造的和可复制分配的.当不知道基础对象的具体类型时，如何深层复制基础对象?

ptr_vector is copy constructible and copy assignable. How can it deep copy the underlying objects when it doesn't know their concrete types?

推荐答案

boost :: ptr_vector 容器具有可选的模板参数 CloneAllocator ，用于定义克隆策略.默认分配器是 heap_clone_allocator ，它仅调用复制构造函数来克隆对象.

The boost::ptr_vector container has an optional template parameter, CloneAllocator, that defines the cloning policy. The default allocator is the heap_clone_allocator, which simply invokes the copy constructor to clone an object.

克隆分配器用作在克隆周围添加间接层的一种方式.例如，它允许您提供一个自定义分配器，该分配器可以正确处理不可复制类型的克隆.

The Clone Allocator is used as a way to add a layer of indirection around the cloning. For example, it allows you to provide a custom allocator that correctly handles cloning of a noncopyable type.

您可以在 Boost Pointer Containers中找到更多信息.库文档，说明了可克隆和克隆分配器的概念.

You can find more information in the Boost Pointer Containers Library documentation, which explains the Clonable and Clone Allocator concepts.

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