集合类型的变长参数列表 [英] Variable length argument list of set type

问题描述

好吧，我很确定之前已经以某种方式讨论过这个问题，但我显然太笨了，找不到它.

Alright, I'm pretty sure that this has been discussed before in some way or another, but I'm apparently too stupid to find it.

首先:我不是在寻找 va_list 和其他宏.我正在寻找的是类似于主函数​​参数的东西.

First: I'm NOT looking for va_list and the other macros. What I am looking for is something like the main-function parameters.

众所周知，默认原型是:

The default prototype, as all of you know is:

int main(int argc, char *argv[]);

现在，我希望我的程序有类似的东西，但不知道具体如何.

Now, I want something similar for my program, but don't know how exactly.

假设我们有这个函数:

void Function(int argc, unsigned short *args[]) {
    for(int i = 0; i < argc; ++i) printf("%hu ", args[i]);
}

我想要这样的函数调用:

And I want something like this function call:

Function(5, 1, 2, 3, 4, 5);

那行得通吗?因为我不想要 va_list 的'杂乱'，也不想创建:

Would that work? Because I don't want the 'cluttering' of va_list, nor do I want to create:

void AnotherFunction() {
    unsigned short Args[] = { 1, 2, 3, 4, 5 };
    Function(5, Args);
}

只是因为在那种情况下我只需要一个简单的指针.有人可以指出我正确的方向吗?非常感谢.

Simply because in that case I would only need a simple pointer. Could someone please point me in the right direction? Thank you very much.

感谢大家的宝贵意见.我会满足于目前不适用于标准 C/C++，并为我的问题寻找不同的方法.

Thank you everyone for your valuable input. I'll settle for 'Doesn't work with standard C/C++ for now and look for a different approach to my problem.

再次感谢您.

推荐答案

一个 g++ 特定的解决方案:

A g++ specific solution:

const size_t MAX_ARGS = 42;

void Function(int argc, const unsigned short (&args)[MAX_ARGS])
{
}

int main()
{
    Function(5, {1,2,3,4,5});
}

如果你实际上不需要argc参数，你可以写一个模板:

If you don't actually need the argc parameter, you can write a template:

template<size_t N>
void Function(const unsigned short(&args)[N])
{
    // use N
}

这适用于 C++03.数组必须是常量，否则你不能像这样传递临时初始化列表.如果您需要修改函数内部的元素，则需要进行复制.

This works in C++03. The array needs to be const, or else you can't pass a temporary initializer list like that. If you need to modify the elements inside the function, you'll need to make a copy.

这篇关于集合类型的变长参数列表的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！