Function xcb::cache_extensions_data

pub fn cache_extensions_data(
    conn: *mut xcb_connection_t,
    mandatory: &[Extension],
    optional: &[Extension],
) -> Vec<ExtensionData>

Returns the extension data for the given extensions. This function may block as the data will be queried from the server if not already cached.

#Panics This function will panic if a mandatory extension is not present on the server.