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CFAllocatorPreferredSizeCallBack

A prototype for a function callback that gives the size of memory likely to be allocated, given a certain request.

Declaration

typealias CFAllocatorPreferredSizeCallBack = (CFIndex, CFOptionFlags, UnsafeMutableRawPointer?) -> CFIndex

Parameters

  • size:

    The amount of memory requested.

  • hint:

    A bitfield that is currently not used (always set to 0).

  • info:

    An untyped pointer to program-defined data.

Return Value

The actual size the allocator is likely to allocate given this request.

Discussion

A prototype for a function callback that determines whether there is enough free memory to satisfy a request. In implementing this function, return the actual size the allocator is likely to allocate given a request for a block of memory of size size. The hint argument is a bitfield that you should currently not use.

See Also

Callbacks