将类的private属性隐藏进一个内部类，然后通过一个指针访问（提前声明）它的接口。在头文件中只 暴露出应该暴露的功能 ...
.NET and Java developers are perplexed about the indiscreet way C++ discloses private class details. Pimpl (pointer-to-implementation) solves this problem by keeping secrets hidden from peepers. I ...
/***** my_queue.h *****/ #include <memory> #include <string> using namespace std; typedef string element_t; class my_queue { struct queue_impl; // forward-declared ...
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