Copy std::stack into an std::vector

Question

Is the following code guaranteed by the standard to work(assuming st is not empty)?

#include 
#include 
int main()
{
   extern std::st         


        

Answer 1

Yes, it's guaranteed. Vectors are guaranteed to use contiguous storage, so your code will work. It's a bit cludgy though - and if someone changes the underlying container type of the stack, your code will continue to compile without errors, yet the runtime behaviour will be broken.