C++1z 的范围状态?
C++ 委员会中有一个范围研究小组:
There is a study group on ranges in the C++ committee:
但我没有关注这个研究组的历史，我不确定 C++1z 的预期交付类型(此外我不使用 boost.range，因此我对现有的实践).我们会有:
but I have not followed the history of this study group and I am not sure of what kind of delivery is expected for C++1z (furthermore I do not use boost.range so I do not have a clear view of existing practices). Will we have:
将范围作为一对第一个/最后一个迭代器?
ranges as a pair of first/last iterators?
范围上的联合和其他集合操作(??例如 [v.begin()+5, v.begin()+7[ U [v.begin()+10, v.begin()+15[ U[v.begin()+21,v.begin()+42[)，即:并集、交集、不相交并集、补集?
union and other set operations on ranges(for example [v.begin()+5, v.begin()+7[ U [v.begin()+10, v.begin()+15[ U [v.begin()+21, v.begin()+42[), namely: union, intersection, disjoint union, complement?
迭代器过滤器(为了在满足条件的地方执行 for_each)?
iterator filters (in order to execute a for_each where a condition is satisfied)?
其他事情?
推荐答案
Eric Niebler 开始讨论他的 Iterable 工作(由四部分组成的博客文章:第 1 部分，第 2 部分，第 3 部分，第 4 部分) 在 SG9 邮件列表 2 月 27 日.从那以后有很多来回，特别是考虑到该列表已经死了大约一年.
Eric Niebler initiated discussion of his Iterable work (four-part blog posting: Part 1, Part 2, Part 3, Part 4) on the SG9 mailing list on Feb 27. There's been quite a bit of back and forth since then, especially considering that the list had been dead for about a year.
据我所知，作为局外人，SG 正在争论他们想要做什么".与制定标准/技术规范的措辞"相去甚远的阶段.阶段.然而，这是从休眠"状态向前迈出的一大步.阶段.最近几次委员会会议的会议记录很有启发性:
As near as I can tell as an outsider, the SG is in the "arguing about what they're trying to do" phase which is quite far from the "developing wording for a Standard/Technical Specification" phase. This is, however, a substantial move forward from the "dormant" phase. The meeting minutes from the last few committee meetings are illuminating:
2013-05-03(布里斯托):
Marshall Clow [研究小组主席] 报告小组目前患有视力过度问题.没有论文.SG9 试图限制范围.预计不会进入 C++14
Marshall Clow [the study group chair] reports group is currently suffering from an excess of vision. There are no papers. SG9 is trying to constrain scope. Nothing expected to go into C++14
2013-10-16(芝加哥):
Clow 报告过去几个月没有任何活动.一篇论文来讨论 [我相信 N3752 "基于索引的范围"].将有晚上的会议.
Clow reports no activity in past few months. One paper to discuss [I believe N3752 "Index Based Ranges"]. Will have evening session.
2014-03-03(伊萨夸):
Clow 没有报告任何文件，也没有会议.[Stephan] Lavavej 在 EWG 中报告了人们可能关心的范围的论文 [我相信指的是 N3853 基于范围的 For 循环:下一代"].道斯问工作是否停滞不前.Clow 说他的工作停滞不前，他还没有看到其他人正在做的工作.[Jeffrey] Yasskin 说他不确定论文的去向，这可能会阻碍 SG9 对论文的考虑.
Clow reports no papers and no meeting. [Stephan] Lavavej reports a ranged for paper in EWG that the range people may care about [I believe referring to N3853 "Range-Based For-Loops: The Next Generation"]. Dawes asks if work is stalled. Clow says his work is stalled and he has not seen work others are doing. [Jeffrey] Yasskin says that he is unsure of where the papers are going which may be stalling SG9 consideration of papers.
它并没有像大炮一样发展，AFAIK 也没有设定可交付的目标.
It hasn't exactly been going like gangbusters, and there is no set deliverable goal AFAIK.
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