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# std.experimental.allocator.mmap_allocator

struct `MmapAllocator`;
  Allocator (currently defined only for Posix and Windows) using mmap and munmap directly (or their Windows equivalents). There is no additional structure: each call to allocate(s) issues a call to mmap(`null`, s, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0), and each call to deallocate(b) issues munmap(b.ptr, b.length). So `MmapAllocator` is usually intended for allocating large chunks to be managed by fine-granular allocators.
  static shared MmapAllocator `instance`;
    The one shared `instance`.
  enum size_t `alignment`;
    Alignment is page-size and hardcoded to 4096 (even though on certain systems it could be larger).
  shared void[] `allocate`(size_t `bytes`);
  shared nothrow @nogc bool `deallocate`(void[] `b`);
    Allocator API.

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