operator=() [1/3]

template<typename _Tp, typename _Alloc>

deque< _Tp, _Alloc > & deque::operator=

(

const deque< _Tp, _Alloc > &

__x

)

Deque assignment operator.

Parameters

__x	A deque of identical element and allocator types.

All the elements of x are copied.

The newly-created deque uses a copy of the allocator object used by __x (unless the allocator traits dictate a different object).

Definition at line 95 of file deque.tcc.

    {
      if (std::__addressof(__x) != this)
      {
#if __cplusplus >= 201103L
        if (_Alloc_traits::_S_propagate_on_copy_assign())
          {
            if (!_Alloc_traits::_S_always_equal()
              && _M_get_Tp_allocator() != __x._M_get_Tp_allocator())
            {
              // Replacement allocator cannot free existing storage,
              // so deallocate everything and take copy of __x's data.
              _M_replace_map(__x, __x.get_allocator());
              std::__alloc_on_copy(_M_get_Tp_allocator(),
                               __x._M_get_Tp_allocator());
              return *this;
            }
            std::__alloc_on_copy(_M_get_Tp_allocator(),
                           __x._M_get_Tp_allocator());
          }
#endif
        const size_type __len = size();
        if (__len >= __x.size())
          _M_erase_at_end(std::copy(__x.begin(), __x.end(),
                              this->_M_impl._M_start));
        else
          {
            const_iterator __mid = __x.begin() + difference_type(__len);
            std::copy(__x.begin(), __mid, this->_M_impl._M_start);
            _M_range_insert_aux(this->_M_impl._M_finish, __mid, __x.end(),
                          std::random_access_iterator_tag());
          }
      }
      return *this;
    }

References deque(), std::__addressof(), _M_erase_at_end(), _M_get_Tp_allocator(), _M_impl, _M_range_insert_aux(), _M_replace_map(), __gnu_cxx::__alloc_traits< _Tp_alloc_type >::_S_always_equal(), __gnu_cxx::__alloc_traits< _Tp_alloc_type >::_S_propagate_on_copy_assign(), begin(), std::copy(), end(), get_allocator(), and size().

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