April 2018
Intermediate to advanced
303 pages
4h 54m
Chinese
Content preview from Effective Modern C++（中文版）
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智能指针
｜
149
数据结构以及更慢一些的目标代码，但在使用编译器生成的特种函数时，其指涉到的
型别却并不要求是完整型别。
就
Pimpl
习惯用法而言，并不需要在
std::unique_ptr
和
std::shared_ptr
的特性之
间作出权衡，因为
Widget
和
Widget::Impl
这样的类之间的关系是专属所有权，所以
在此处
std::unique_ptr
就是完成任务的合适工具。话说回来，还是需要了解，在其
他情景下——存在共享所有权的情景下（从而
std::shared_ptr
成为合适的设计选项），
就大可不必忍受
std::unique_ptr
所带来的必须自行撰写一系列函数定义的煎熬。
要点速记
•
Pimpl
惯用法通过降低类的客户和类实现者之间的依赖性，减少了构建遍数。
•
对于采用
std::unique_ptr
来实现的
pImpl
指针，须在类的头文件中声明
特种成员函数，但在实现文件中实现它们。即使默认函数实现有着正确行为，
也必须这样做。
•
上述建议仅适用于
std::unique_ptr
，但并不适用
std::shared_ptr
。
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