class FFI::AutoPointer

def self.from_native(val, ctx)
  self.new(val)
end

def self.native_type
  raise RuntimeError.new("no release method defined for #{self.inspect}") unless self.respond_to?(:release)
  Type::POINTER
end

def autorelease=(autorelease)
  @releaser.autorelease=(autorelease)
end

def autorelease?
  @releaser.autorelease
end

def free
  @releaser.free
end

def initialize(ptr, proc=nil, &block)
  super(ptr)
  raise TypeError, "Invalid pointer" if ptr.nil? || !ptr.kind_of?(Pointer) \
    || ptr.kind_of?(MemoryPointer) || ptr.kind_of?(AutoPointer)
  @releaser = if proc
                raise RuntimeError.new("proc must be callable") unless proc.respond_to?(:call)
                CallableReleaser.new(ptr, proc)
              else
                raise RuntimeError.new("no release method defined") unless self.class.respond_to?(:release)
                DefaultReleaser.new(ptr, self.class)
              end
  ObjectSpace.define_finalizer(self, @releaser)
  self
end