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CGShadingCreateAxial retains CGFunctionRef?

Hi,

The docs for CGShadingCreateAxial don't mention if the CGFunctionRef passed to it is retained by the shading or not.

At the moment (10.4.1) it seems that CGShadingCreateAxial is retaining the CGFunctionRef (or only using it before the create function returns), as I can release it after passing it to CGShadingCreateAxial and everything behaves. Is this behaviour guaranteed, or just an aspect of the current implementation?

My current code is:

CGColorSpaceRef colorspace = CGColorSpaceCreateWithName (kCGColorSpaceGenericRGB);

    CGFunctionRef function = CGFunctionCreate ((void *) components,
                                               1,
                                               input_value_range,
                                               components,
                                               output_value_ranges,
                                               &callbacks);

    CGShadingRef shading = CGShadingCreateAxial (colorspace,
                                                 startPoint, endPoint,
                                                 function,
                                                 true, true);

CGColorSpaceRelease(colorspace); //Docs specify that this is retained by the CGShadingRef
CGFunctionRelease(function); //Don't know if this is safe


Cheers - Tom
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