After std::vector::resize() throws a std::bad_alloc exception, is the original data still valid and accessible in the std::vector object?
Does the answer hold for other allocators, e.g. if boost::interprocess::allocator is used as the allocator, and boost::interprocess::bad_alloc is thrown?
std::vector::resize is exception safe.
If an exception is thrown, this function has no effect (strong exception guarantee).
Link to the exception specification. The specification doesn't mention any particular requirement on the allocator and must hold regardless of the allocator you provide.
is the original data still valid and accessible in the
std::vectorobject?
Yes, std::vector::resize has strong exception guarantee (except for the case mentioned as follows). §26.3.11.3/15 vector capacity [vector.capacity]:
If an exception is thrown other than by the move constructor of a non-CopyInsertable T there are no effects.
The guarantee has nothing to do with what kind of allocator is specified; so it's always true.
