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可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: #include <vector> struct C { std::vector<int> v; decltype(v.begin()) begin() { return v.begin(); } decltype(v.end()) end() { return v.end(); } }; Clang++ has no problem, but MSVC 2013 gives the following error: error C2228: left of '.begin' must have class/struct/union 回答1: This is a known bug in VS2013, fixed in VS2015. The compiler will accept the code if you use a trailing return type instead. struct C { std::vector<int> v; auto begin() -> decltype(v.begin()) { return v.begin(); } auto end() -> decltype(v.end()) { return v.end(); } }; As

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am developing a single thread app with Delphi, which will do a time-consuming task, like this: // time-consuming loop For I := 0 to 1024 * 65536 do Begin DoTask(); End; When the loop starts, the application will lose responses to the end user. That is not very good. I also do not want to convert it into a multi-thread application because of its complexity, so I add Application.ProcessMessages accordingly, // time-consuming loop For I := 0 to 1024 * 65536 do Begin DoTask(); Application.ProcessMessages; End; However, this time although the

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Hi I was writing a program that imports private keys from a .pem file and create a private key object to use it later.. the problem I have faced is that some pem files header begin with -----BEGIN PRIVATE KEY----- while others begin with -----BEGIN RSA PRIVATE KEY----- through my search I knew that the first ones are PKCS#8 formatted but I couldn't know what format does the other one belongs to. 回答1: See https://polarssl.org/kb/cryptography/asn1-key-structures-in-der-and-pem (search the page for "BEGIN RSA PRIVATE KEY") ( archive link for

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Is there a container adapter that would reverse the direction of iterators so I can iterate over a container in reverse with range-based for-loop? With explicit iterators I would convert this: for (auto i = c.begin(); i != c.end(); ++i) { ... into this: for (auto i = c.rbegin(); i != c.rend(); ++i) { ... I want to convert this: for (auto& i: c) { ... to this: for (auto& i: std::magic_reverse_adapter(c)) { ... Is there such a thing or do I have to write it myself? 回答1: Actually Boost does have such adaptor: boost::adaptors::reverse . #include

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: Given a list of intervals of time, I need to find the set of maximum non-overlapping intervals. For example, if we have the following intervals: [ 0600 , 0830 ], [ 0800 , 0900 ], [ 0900 , 1100 ], [ 0900 , 1130 ], [ 1030 , 1400 ], [ 1230 , 1400 ] Also it is given that time have to be in the range [0000, 2400] . The maximum non-overlapping set of intervals is [0600, 0830], [0900, 1130], [1230, 1400] . I understand that maximum set packing is NP-Complete. I want to confirm if my problem (with intervals containing only start and end

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: In history-books you often have timeline, where events and periods are marked on a line in the correct relative distance to each other. How is it possible to create something similar in LaTeX? 回答1: The tikz package seems to have what you want. \documentclass{article} \usepackage{tikz} \usetikzlibrary{snakes} \begin{document} \begin{tikzpicture}[snake=zigzag, line before snake = 5mm, line after snake = 5mm] % draw horizontal line \draw (0,0) -- (2,0); \draw[snake] (2,0) -- (4,0); \draw (4,0) -- (5,0); \draw[snake] (5,0) -- (7,0); % draw

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I'm creating a calendar where I print out weeks in a tabular format. One requirement is that I be able to start the weeks either on Monday or Sunday, as per some user option. I'm having a hard time using moment's isoWeekday method. // Start of some date range. Can be any day of the week. var startOfPeriod = moment ( "2013-06-23T00:00:00" ), // We begin on the start of the first week. // Mon Tues Wed Thur Fri Sat Sun // 20 21 22 23 24 25 26 begin = moment ( startOfPeriod ). isoWeekday ( 1 ); // will pull from user setting console .

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: When you need to reset a stream to beginning (e.g. MemoryStream ) is it best practice to use stream.Seek(0, SeekOrigin.Begin); or stream.Position = 0; I've seen both work fine, but wondered if one was more correct than the other? 回答1: Use Position when setting an absolute position and Seek when setting a relative position. Both are provided for convenience so you can choose one that fits the style and readability of your code. Accessing Position requires the stream be seekable so they're safely interchangeable. 文章来源: Stream.Seek(0,

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I am trying to write a stream operator for std containers, mainly for the purpose of debugging. I have the following code: #include #include #include #include #include #include #include #include #include template struct is_container { typedef char no ; typedef long yes ; template struct is_of_type ; template static yes & is_cont ( is_of_type < typename T :: iterator ( T ::*)(), & T :: begin , & T :: end >*); template static no & is_cont (...); //any other template struct is_class_is_container { const static bool value = sizeof ( is

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Failing Oozie Launcher, Main class [org.apache.oozie.action.hadoop.SqoopMain], main() threw exception, begin > end in range (begin, end): (1464070940802, 1464070938036) java.lang.IllegalArgumentException: begin > end in range (begin, end): (1464070940802, 1464070938036) at org.apache.hadoop.yarn.api.protocolrecords.impl.pb.GetApplicationsRequestPBImpl.setStartRange(GetApplicationsRequestPBImpl.java:340) at org.apache.oozie.action.hadoop.LauncherMainHadoopUtils.getChildYarnJobs(LauncherMainHadoopUtils.java:68) at org.apache.oozie.action