disabled exceptions and noexcept()

Question

std::swap is declared this way:

template <class T> void swap (T& a, T& b)
    noexcept (is_nothrow_move_constructible<T>::value && 
              is_nothrow_move_assignable<T>::value);

If I disable exceptions in my program (like with -fno-exceptions for g++) will std::swap use move operations for my custom types if they are move-enabled no matter if they are noexcept or not?

EDIT: follow-up question:

After realizing that std::swap will always use moves if my type has them, my real question is what happens to traits like is_nothrow_move_assignable<>?

Will std::vector always use moves when reallocating if my types have noexcept(true) move operations?

Answer 1

The noexcept-specification on swap solely tells the user where she can use swap without encountering an exception. The implementation is practically always equivalent to

auto tmp = std::move(a);
a = std::move(b);
b = std::move(tmp);

Which moves the objects around if, and only if, overload resolution selects a move assignment operator and/or constructor.