std.experimental.allocator.mallocator - D Programming Language
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Keywords: D programming language

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# std.experimental.allocator.mallocator

struct Mallocator;
  The C heap allocator.
  Examples:

      auto buffer = Mallocator.instance.allocate(1024 * 1024 * 4);
      scope(exit) Mallocator.instance.deallocate(buffer);
      //...

  enum uint alignment;
    The alignment is a static constant equal to platformAlignment, which ensures proper alignment for any D data type.
  shared nothrow @nogc @trusted void[] allocate(size_t bytes);
  shared nothrow @nogc @system bool deallocate(void[] b);
  shared nothrow @nogc @system bool reallocate(ref void[] b, size_t s);
    Standard allocator methods per the semantics defined above. The deallocate and reallocate methods are @system because they may move memory around, leaving dangling pointers in user code. Somewhat paradoxically, malloc is @safe but that's only useful to safe programs that can afford to leak memory allocated.
  static shared Mallocator instance;
    Returns the global instance of this allocator type. The C heap allocator is thread-safe, therefore all of its methods and it itself are shared.
struct AlignedMallocator;
  Aligned allocator using OS-specific primitives, under a uniform API.
  Examples:

      auto buffer = AlignedMallocator.instance.alignedAllocate(1024 * 1024 * 4,
          128);
      scope(exit) AlignedMallocator.instance.deallocate(buffer);
      //...

  enum uint alignment;
    The default alignment is platformAlignment.
  shared nothrow @nogc @trusted void[] allocate(size_t bytes);
    Forwards to alignedAllocate(bytes, platformAlignment).
  shared nothrow @nogc @trusted void[] alignedAllocate(size_t bytes, uint a);
    Uses posix_memalign on Posix and _aligned_malloc on Windows.
  shared nothrow @nogc @system bool deallocate(void[] b);
    Calls free(b.ptr) on Posix and _aligned_free(b.ptr) on Windows.
  shared nothrow @nogc @system bool reallocate(ref void[] b, size_t newSize);
    On Posix, forwards to realloc. On Windows, forwards to alignedReallocate(b, newSize, platformAlignment).
  static shared AlignedMallocator instance;
    Returns the global instance of this allocator type. The C heap allocator is thread-safe, therefore all of its methods and instance itself are shared.

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