cast ： 強制轉換類型

原創 jlnhyd 2018-09-03 01:50 
#define G_TYPE_CHECK_CLASS_CAST(g_class, g_type, c_type)

首先檢查g_class是否爲g_type, 如果是將g_class強制轉換爲c_type; 否則出warning.
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