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# std.experimental.allocator.building_blocks.scoped_allocator

struct `ScopedAllocator`(ParentAllocator);
  `ScopedAllocator` delegates all allocation requests to ParentAllocator. When destroyed, the `ScopedAllocator` object automatically calls deallocate for all memory allocated through its lifetime. (The deallocateAll function is also implemented with the same semantics.)
  deallocate is also supported, which is where most implementation effort and overhead of `ScopedAllocator` go. If deallocate is not needed, a simpler design combining AllocatorList with Region is recommended.
  Examples:

      import std.experimental.allocator.mallocator : Mallocator;
      import std.typecons : Ternary;
      ScopedAllocator!Mallocator alloc;
      writeln(alloc.empty); // Ternary.yes
      const b = alloc.allocate(10);
      writeln(b.length); // 10
      writeln(alloc.empty); // Ternary.no

  Allocator `parent`;
    If ParentAllocator is stateful, `parent` is a property giving access to an AffixAllocator!ParentAllocator. Otherwise, `parent` is an alias for AffixAllocator!ParentAllocator.instance.
  enum auto `alignment`;
    Alignment offered
  size_t `goodAllocSize`(size_t `n`);
    Forwards to parent.`goodAllocSize` (which accounts for the management overhead).
  void[] `allocate`(size_t `n`);
    Allocates memory. For management it actually allocates extra memory from the parent.
  bool `expand`(ref void[] `b`, size_t `delta`);
    Forwards to parent.`expand`(`b`, `delta`).
  bool `reallocate`(ref void[] `b`, size_t `s`);
    Reallocates `b` to new size `s`.
  Ternary `owns`(void[] `b`);
    Forwards to parent.`owns`(`b`).
  bool `deallocate`(void[] `b`);
    Deallocates `b`.
  bool `deallocateAll`();
    Deallocates all memory allocated.
  const Ternary `empty`();
    Returns Ternary.yes if this allocator is not responsible for any memory, Ternary.no otherwise. (Never returns Ternary.unknown.)

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