| Home | Libraries | People | FAQ | More

## Class new_allocator<void>

boost::container::new_allocator<void> — Specialization of new_allocator for void types.

## Synopsis

    // In header: <boost/container/new_allocator.hpp>

    class new_allocator<void> {
    public:
      // types
      typedef void                   value_type;
      typedef void *                 pointer;
      typedef const void *           const_pointer;
      typedef implementation_defined propagate_on_container_move_assignment;  // A integral constant of type bool with value true.
      typedef implementation_defined is_always_equal;                         // A integral constant of type bool with value true.

      // member classes/structs/unions
      template<typename T2>
      struct rebind {
        // types
        typedef new_allocator< T2 > other;
      };

      // construct/copy/destruct
      new_allocator() noexcept;
      new_allocator(const new_allocator &) noexcept;
      template<typename T2> new_allocator(const new_allocator< T2 > &) noexcept;

      // friend functions
      friend void swap(new_allocator &, new_allocator &) noexcept;
      friend bool operator==(const new_allocator &, const new_allocator &) noexcept;
      friend bool operator!=(const new_allocator &, const new_allocator &) noexcept;
    };

## Description

### `new_allocator` public construct/copy/destruct

1.     new_allocator() noexcept;

   Default constructor Never throws

2.     new_allocator(const new_allocator &) noexcept;

   Constructor from other `new_allocator`. Never throws

3.     template<typename T2> new_allocator(const new_allocator< T2 > &) noexcept;

   Constructor from related `new_allocator`. Never throws

### `new_allocator` friend functions

1.     friend void swap(new_allocator &, new_allocator &) noexcept;

   Swaps two allocators, does nothing because this `new_allocator` is stateless

2.     friend bool operator==(const new_allocator &, const new_allocator &) noexcept;

   An `new_allocator` always compares to true, as memory allocated with one instance can be deallocated by another instance

3.     friend bool operator!=(const new_allocator &, const new_allocator &) noexcept;

   An `new_allocator` always compares to false, as memory allocated with one instance can be deallocated by another instance