[C++] check container been moved

Reference:
https://stackoverflow.com/questions/29294316/check-if-stdmove-is-done-on-container
n3264

• moved-from shared_ptrs are guaranteed empty
• containers can be "emptier than empty" concept
• user-defined types can be created as weaker concept
• std::containers should be strict concept; i.e after move .empty() should return 'true'