__attribute__((format(printf, 1, 2))) 用于 MSVC?
使用 GCC,我可以指定 __attribute__((format(printf, 1, 2)))
,告诉编译器这个函数采用 vararg 参数,这些参数是 printf 格式说明符.
With GCC, I can specify __attribute__((format(printf, 1, 2)))
, telling the compiler that this function takes vararg parameters that are printf format specifiers.
这在我包装的情况下非常有用,例如vsprintf 函数族.我可以有extern void log_error(const char *format, ...) __attribute__((format(printf, 1, 2)));
This is very helpful in the cases where I wrap e.g. the vsprintf function family. I can have
extern void log_error(const char *format, ...) __attribute__((format(printf, 1, 2)));
每当我调用这个函数时,gcc 都会检查参数的类型和数量是否符合给定的格式说明符,就像 printf 一样,如果不是,则发出警告.
And whenever I call this function, gcc will check that the types and number of arguments conform to the given format specifiers as it would for printf, and issue a warning if not.
微软的 C/C++ 编译器有没有类似的东西?
Does the Microsoft C/C++ compiler have anything similar ?
推荐答案
虽然 GCC 在启用 -Wformat 时检查格式说明符,但 VC++ 没有这种检查,即使对于标准函数也是如此,因此没有与此等效的 __attribute__
因为没有等效于 -Wformat.
While GCC checks format specifiers when -Wformat is enabled, VC++ has no such checking, even for standard functions so there is no equivalent to this __attribute__
because there is no equivalent to -Wformat.
我认为微软对 C++ 的重视(通过保持 C++ 的 ISO 合规性来证明,同时只支持 C89)可能是 VC++ 没有格式说明符检查的部分原因;在 C++ 中使用
格式说明符是不必要的.
I think Microsoft's emphasis on C++ (evidenced by maintaining ISO compliance for C++ while only supporting C89) may be in part the reason why VC++ does not have format specifier checking; in C++ using <iostream>
format specifiers are unnecessary.
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