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在
Python C Module – Malloc fails in specific version of Python的第一条评论中,@ user694733提到将char **转换为void **无效.我读过
Invalid conversion from Foo** to void** – why is implicit type conversion allowed to void* but not to void**?和
http://c-faq.com/ptrs/genericpp.html,但有一个标准的引用,但没有真实的例子,在这种情况下,这可能是不正确的,导致错误.考虑例如void **加倍**或反之亦然,是否有可能出错的情况？为什么(从技术上讲,不仅仅因为它是UB)？
解决方法
but there is a reference to standard,but no real example,in which case this might be incorrect,leading to errors
这不准确.您提到的页面http://c-faq.com/ptrs/genericpp.html指向另一个页面http://c-faq.com/null/machexamp.html,其中包含不同类型的指针大小不同的计算机示例：
The Eclipse MV series from Data General has three architecturally supported pointer formats (word,byte,and bit pointers),two of which are used by C compilers: byte pointers for char * and void *,and word pointers for everything else. For historical reasons during the evolution of the 32-bit MV line from the 16-bit Nova line,word pointers and byte pointers had the offset,indirection,and ring protection bits in different places in the word. Passing a mismatched pointer format to a function resulted in protection faults. Eventually,the MV C compiler added many compatibility options to try to deal with code that had pointer type mismatch errors.
（编辑：李大同）
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