API Shakeup: user data (was Re: [cairo] Patch improving fallbacks)

[Keith Packard]

Around 17 o'clock on Feb 15, =?UTF-8?B?S3Jpc3RpYW4gSMO4Z3NiZXJn?= wrote:

> >>What about just using a void pointer as key?

By using a specific (unusual) type as the key we prevent people from
accidentally inverting the two arguments.

const cairo_key_t	foo_key;

	cairo_surface_set_data (surface, &foo_key, data, destroy_data);

Using 'const' also avoids letting people pass it to the get_data 
function...

-keith


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