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# std.experimental.allocator.building_blocks.null_allocator

Source std/experimental/allocator/building_blocks/null_allocator.d

struct `NullAllocator`;
  `NullAllocator` is an emphatically empty implementation of the allocator interface. Although it has no direct use, it is useful as a "terminator" in composite allocators.
  enum uint `alignment`;
    NullAllocator advertises a relatively large alignment equal to 64 KB. This is because NullAllocator never actually needs to honor this alignment and because composite allocators using NullAllocator shouldn't be unnecessarily constrained.
  shared pure nothrow @nogc @safe void[] `allocate`(size_t);
    Always returns null.
  shared pure nothrow @nogc @safe void[] `alignedAllocate`(size_t, uint);
    Always returns null.
  shared pure nothrow @nogc @safe void[] `allocateAll`();
    Always returns null.
  shared pure nothrow @nogc @safe bool `expand`(ref void[] `b`, size_t `s`);
  shared pure nothrow @nogc @safe bool `reallocate`(ref void[] `b`, size_t);
  shared pure nothrow @nogc @safe bool `alignedReallocate`(ref void[] `b`, size_t, uint);
    These methods return false.

    Precondition b is null. This is because there is no other possible legitimate input.

  shared const pure nothrow @nogc @safe Ternary `owns`(const void[]);
    Returns Ternary.no.
  shared const pure nothrow @nogc @safe Ternary `resolveInternalPointer`(const void*, ref void[]);
    Returns Ternary.no.
  shared pure nothrow @nogc @safe bool `deallocate`(void[] `b`);
    No-op.

    Precondition b is null

  shared pure nothrow @nogc @safe bool `deallocateAll`();
    No-op.
  shared const pure nothrow @nogc @safe Ternary `empty`();
    Returns Ternary.yes.
  static shared NullAllocator `instance`;
    Returns the shared global instance of the NullAllocator.

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