STL containers element destruction order

问题

Does ISO C++ standard mandate any sort of destruction order of objects inside STL containers?

• Are std::list/std::vector/std::map elements destroyed starting from the beginning or the end of the container?
• Can I rely on std::map storing its elements in std::pairs internally so a key in a pair is destroyed before its value (or vice versa)?

回答1:

1. Unspecified in the standard.
2. Yes, but this means that the key is destroyed after its associated value.

回答2:

1. Unspecified
2. Yes, you can depend on std::map storing it's elements in std::pairs, but I don't see anything which specifies the Key portion of a std::pair being destructed before a Value portion.

来源：https://stackoverflow.com/questions/2083603/stl-containers-element-destruction-order