namespaces

问题 I know Docker has a embedded Dns resolver. when I run a container in myself bridge: $ docker run -it --rm --privileged --network=mybridge xxx bash root@18243bfe6b50:/# cat /etc/resolv.conf nameserver 127.0.0.11 options ndots:0 root@18243bfe6b50:/# netstat -anop Active Internet connections (servers and established) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name Timer tcp 0 0 127.0.0.11:45997 0.0.0.0:* LISTEN - off (0.00/0/0) udp 0 0 127.0.0.11:49614 0.0.0.0:* it shows

问题 I am dealing with an already created Document object. I have to be able to set it's base namespace (attribute name "xmlns") to certain value. My input is DOM and is something like: <root>...some content...</root> What I need is DOM which is something like: <root xmlns="myNamespace">...some content...</root> That's it. Easy, isn't it? Wrong! Not with DOM! I have tried the following: 1) Using doc.getDocumentElement().setAttribute("xmlns","myNamespace") I get a document with empty xmlns (it

问题 I am dealing with an already created Document object. I have to be able to set it's base namespace (attribute name "xmlns") to certain value. My input is DOM and is something like: <root>...some content...</root> What I need is DOM which is something like: <root xmlns="myNamespace">...some content...</root> That's it. Easy, isn't it? Wrong! Not with DOM! I have tried the following: 1) Using doc.getDocumentElement().setAttribute("xmlns","myNamespace") I get a document with empty xmlns (it

问题 I am dealing with an already created Document object. I have to be able to set it's base namespace (attribute name "xmlns") to certain value. My input is DOM and is something like: <root>...some content...</root> What I need is DOM which is something like: <root xmlns="myNamespace">...some content...</root> That's it. Easy, isn't it? Wrong! Not with DOM! I have tried the following: 1) Using doc.getDocumentElement().setAttribute("xmlns","myNamespace") I get a document with empty xmlns (it

问题 I have this error: 'someFunction' is not an exported object from 'namespace:somePackage' Does anyone know how to solve it? 回答1: Some reasons: Function is not part of the package, anymore, try ??someFunction to find out which package it belongs to. Package data is not part of the package Function is available in newer version of the package, reinstall latest version. See also these questions referring to specific instances of this problem: Error: 'use_package' is not an exported object from

问题 I'm adding a mountable engine to my rails app, which provides a forum-like functionality (i.e. adds questions, answers, comments, etc). Everything works fine in development. In staging/production, however, I get an error when trying to create an answer, specifically a CanCan permission error (though I think that may be a red herring). But it feels like ti might be related to namespacing or name collision? At any rate, the issue goes away when I set config.cache_classes = false in my

问题 I have this error: 'someFunction' is not an exported object from 'namespace:somePackage' Does anyone know how to solve it? 回答1: Some reasons: Function is not part of the package, anymore, try ??someFunction to find out which package it belongs to. Package data is not part of the package Function is available in newer version of the package, reinstall latest version. See also these questions referring to specific instances of this problem: Error: 'use_package' is not an exported object from

问题 I have this error: 'someFunction' is not an exported object from 'namespace:somePackage' Does anyone know how to solve it? 回答1: Some reasons: Function is not part of the package, anymore, try ??someFunction to find out which package it belongs to. Package data is not part of the package Function is available in newer version of the package, reinstall latest version. See also these questions referring to specific instances of this problem: Error: 'use_package' is not an exported object from

问题 I have some functions that can be grouped together, but don't belong to some object / entity and therefore can't be treated as methods. So, basically in this situation I would create a new namespace and put the definitions in a header file, the implementation in cpp file. Also (if needed) I would create an anonymous namespace in that cpp file and put all additional functions that don't have to be exposed / included to my namespace's interface there. See the code below (probably not the best

问题 I have some functions that can be grouped together, but don't belong to some object / entity and therefore can't be treated as methods. So, basically in this situation I would create a new namespace and put the definitions in a header file, the implementation in cpp file. Also (if needed) I would create an anonymous namespace in that cpp file and put all additional functions that don't have to be exposed / included to my namespace's interface there. See the code below (probably not the best