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Shiroha白羽的博客

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C++ 模版可变参数列表传递给 C 的 va_list 可变参数列表
Shiroha · 2022-01-12 · via Shiroha白羽的博客

C 可变参数

printf 为例,常见如下

1
int printf(const char* format, ...);

CPP 可变参数

常见如下

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2
template<class... Args>
int printf(const string &format, const Args &... args);

若此时需要为 C 的 printf 进行包装,使其可以接受 string 类型的 format,则可以用如下方式实现

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2
3
4
template<class... Args>
int printf(const string &format, const Args &... args) {
return printf(format.c_str(), args...);
}

通常会提示警告,因为 c_str() 得到的字符串不能保证是一个可格式化的字符串,而 printf 的函数原型是

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__attribute__((__format__ (__printf__, 1, 0)))
int printf(const char* format, ...);

这使得 printf 会被检查第一个参数是否满足 printf, scanf, strftime, 或者 strfmon 风格

但是通过此方法可以将部分 C 语言中的方法扩展到 CPP 的模版化