为什么初始化列表不能是main的参数？如何提出呢？ [英] why initializer list cannot be main's parameter? how to propose it?

问题描述

有效的C ++ 主要签名如下：

The valid C++ main signatures are the following:

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

但不允许声明 main 采用初始化程序列表：

But isn't allowed to declare main taking an initializer list:

int main(std::initializer_list<char *> args)

b $ b

AFAIK初始化器列表可以实现为一对指针或一个指针（这可以是 argv 参数）加上一个长度（可以推导出来从 argc 参数），其存储可以是自动，临时或静态只读存储器取决于情况。

AFAIK the initializer list could be implemented as a pair of pointers or a pointer (this could be the argv parameter) plus a length (this could be deduced from the argc parameter), and its storage could be automatic, temporary, or static read-only memory depending on the situation.

所以我认为一个 std :: initializer_list& > 可以处理和管理命令行参数没有任何问题，那么我想知道为什么这个假设的 main 签名没有添加批准C ++ 11标准中的初始化列表，因为我要求：

So i think that an std::initializer_list<char *> could handle and manage without any problem the command line parameters, then i'm wondering why this hypothetical main signature wasn't added after the approval of the initializer lists on the C++11 standard, and because of that i'm asking:

• 可能的缺点或由于允许初始化列表作为 main only参数而导致的问题？


• 这是向标准委员会提出这项增加（或任何其他变更）的正确方法？

• What could be the disadvantages or problems derived of allowing an initializer list as the main only parameter? (i couldn't think of any).
• Which would be the correct way to propose to the standards committee this addition (or any other change)?

推荐答案

虽然有两种方式可以指定 main（）程序，当前实现的C ++运行时调用 main（）函数的方式相同（他们传递参数不管 main（）是如何声明的）。你的建议需要所有实现的C ++运行时来确定程序正在使用哪种类型的 main（），并调用正确的 main （）。如果你真的想要这个功能，你总是可以提供一个实现 main（int，char * []）将参数转换为初始化列表像对象向量<> ），然后调用您选择的新入口点函数。

Although there are two ways of specifying main() in a program, most (all?) current implementations of the C++ run-time call the main() function the same way (they pass the arguments as (int, char *[]) irrespective to how main() is declared). Your proposal would require the C++ run-time of all implementations to figure out which kind of main() the program is using, and call the right main(). If you really want this functionality for yourself, you can always provide an implementation of main(int, char *[]) that converts the arguments into an initializer list like object (such as vector<>), and then calls a new entry point function of your choice.

在标准C ++网站上提交提案。基本步骤是：（1）将其想法浮在其Usenet组/邮件列表上; （2）起草提案，征求反馈意见，并相应更新提案;和（3）重复该过程直到接受该提案。

The process for submitting a proposal is described at the Standard C++ website. The basic steps are: (1) float the idea on their Usenet group/mailing list; (2) draft a proposal, solicit feedback, and update the proposal accordingly; and (3) repeat the process until the proposal is accepted.

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