c++ - Copy std::stack into an std::vector -

is following code guaranteed standard work(assuming st not empty)?

#include <vector> #include <stack> int main() {    extern std::stack<int, std::vector<int> > st;    int* end   = &st.top() + 1;    int* begin = end - st.size();    std::vector<int> stack_contents(begin, end); } 

yes.

std::stack container adapter.

you can see .top() (§23.3.5.3.1)

reference top() { return c.back(); } 

where c container, in case std::vector

which means code translated into:

   extern std::vector<int> st;    int* end   = &st.back() + 1;    int* begin = end - st.size();    std::vector<int> stack_contents(begin, end); 

and std::vector guaranteed continuous there should no problem.

however, not mean idea. if need use "hacks" indicator of bad design. want use std::vector beginning.