stddeque

问题 As read on cplusplus.com, std::queue is implemented as follows: queues are implemented as containers adaptors, which are classes that use an encapsulated object of a specific container class as its underlying container, providing a specific set of member functions to access its elements. Elements are pushed into the "back" of the specific container and popped from its "front". The underlying container may be one of the standard container class template or some other specifically designed

问题 As read on cplusplus.com, std::queue is implemented as follows: queues are implemented as containers adaptors, which are classes that use an encapsulated object of a specific container class as its underlying container, providing a specific set of member functions to access its elements. Elements are pushed into the "back" of the specific container and popped from its "front". The underlying container may be one of the standard container class template or some other specifically designed

问题 I get an compile error here and I have no idea whats wrong with the code. I am using g++ 4.9.2. #include<iostream> #include<deque> using std::string; using std::deque; class Dummy { public: virtual ~Dummy(){}; Dummy():ID_("00") {}; private: const string ID_; }; int main(){ { deque <Dummy> waiter; waiter.push_back(Dummy()); waiter.erase( waiter.begin() ); } return 0; } Edit: I know that removing the const removes the compilation error, but I have no idea why. Anyway, I need this const. 回答1: