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va_start

Va[医]启动

Defined in header ​​
void va_start( va_list ap, parm_n ​​

大va_start宏启用对命名参数后面的变量参数的访问。parm_n...

va_start应该使用实例调用到有效的va_list对象ap在接到任何电话之前va_arg...

如果parm_n类型声明为引用类型，或声明的类型与默认参数提升，该行为是未定义的。

参数

ap-an instance of the va_list type
parm_n-the named parameter preceding the first variable parameter

扩展值

%280%29

注记

va_start需要支持parm_n满载operator&...

例

二次

#include <iostream>
#include <cstdarg>
 
int add_nums(int count, ...) 
{
    int result = 0;
    va_list args;
    va_start(args, count
    for (int i = 0; i < count; ++i) {
        result += va_arg(args, int
    }
    va_end(args
    return result;
}
 
int main() 
{
    std::cout << add_nums(4, 25, 25, 50, 50) << '\n';
}

二次

产出：

二次

150

二次

另见

va_argaccesses the next variadic function argument (function macro)
va_endends traversal of the variadic function arguments (function macro)

c VA文件[医]启动

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