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# dmd.root.region

Region storage allocator implementation.
Authors:
Walter Bright
License:
Boost License 1.0

Source root/region.d

Documentation https://dlang.org/phobos/dmd_root_region.html

Coverage https://codecov.io/gh/dlang/dmd/src/master/src/dmd/root/region.d

struct `Region`;
  Simple region storage allocator.
  nothrow void* `malloc`(size_t `nbytes`);
    Allocate nbytes. Aborts on failure.
    Parameters:

    size_t `nbytes` | number of bytes to allocate, can be 0, must be <= than MaxAllocSize

    Returns:
    allocated data, null for nbytes==0
  nothrow RegionPos `savePos`();
    Return stack position for allocations in this region.
    Returns:
    an opaque struct to be passed to release()
  nothrow void `release`(RegionPos `pos`);
    Release the memory that was allocated after the respective call to savePos().
    Parameters:

    RegionPos `pos` | position returned by savePos()

  nothrow bool `contains`(void* `p`);
    If pointer points into Region.
    Parameters:

    void* `p` | pointer to check

    Returns:
    true if it points into the region
  nothrow size_t `size`();
    Returns:
    size of Region

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