使用typedef摆脱GCC中从字符串常量到'char *'的过时转换警告？

Question

I'm working on updating a very large codebase to be able to use gcc4.3 and ran into this issue. The question has been asked several times, however I think my situation is a little unique and Haven't been able to get a good explanation out of it.

The error I get is

error: deprecated conversion from string constant to 'realchar {aka char*}'

realchar refers to a typedef I have:

typedef char*   realchar;

public:
ClassNameIsMe(const realchar name="UsyncBndLNQueue");

changing realChar to be simply char* removes the warning. however shouldn't that be equivalent since it is a typedef pointing to char*?

Answer 1

The problem is that const realchar name is const pointer to char, ie it is equivalent to:

char * name const

instead of pointer to const char, which would be equivalent to:

const char * name

So the warning is valid.

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See details here:

• Q: typedef pointer const weirdness
• Q: Is typedef'ing a pointer type considered bad practice?