standards

问题 I know that modern browsers generally have two render mode: standard mode and quirk mode. The browser detects the heading DocType. The question is how to detect render mode of current page at runtime. Is there any Firebug tool to do that? 回答1: Before IE8: alert('Page was rendered in ' + ((document.compatMode == 'CSS1Compat') ? 'Standards' : 'Quirks') + ' Mode.'); For IE8: var vMode = document.documentMode; var rMode = 'IE5 Quirks Mode'; if(vMode == 8){ rMode = 'IE8 Standards Mode'; } else if

问题 From what I understand, a HTTP connection could either be keep-alive or close . I sent a HTTP request to a server: GET /page1/ HTTP/1.1 Host: server.com Connection: keep-alive And it responded with: HTTP/1.1 200 OK Connection: keep-alive, close Essentially, I believe the server is bugged because a response like keep-alive, close is ambiguous. However, as the receiver , how should we handle such a message? Should we interpret this header value as keep-alive or close ? 回答1: TL; DR: Chrome

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: What are the rules about using an underscore in a C++ identifier? I'm interested in the relevant sections from the standard (if any). 回答1: Yes, when the underscore is followed by another underscore or an uppercase letter (i.e. for preprocessor #defines or macros), or if the identifier is in the global namespace (§17.6.4.3.2): Certain sets of names and function signatures are always reserved to the implementation

问题 I have a PLC running windows embedded standard where I make some installations and modifications specific to my company's software as part of our installation process (which is all manual today). I'm now in the process of automating this procedure. I want to set the Date and time properties->internet time server to pool.ntp.org through a batch file or similar. The command w32tm is not recognized. I've tried using the command net time /setsntp:pool.ntp.org which returns the command completed

问题 struct A { void f() {} }; void f() {} int main() { auto p1 = &f; // ok auto p2 = f; // ok auto p3 = &A::f; // ok // // error : call to non-static member function // without an object argument // auto p4 = A::f; // Why not ok? } Why must I use address-of operator to get a pointer to a member function? 回答1: auto p1 = &f; // ok auto p2 = f; // ok The first is more or less the right thing. But because non-member functions have implicit conversions to pointers, the & isn't necessary. C++ makes

问题 struct A { void f() {} }; void f() {} int main() { auto p1 = &f; // ok auto p2 = f; // ok auto p3 = &A::f; // ok // // error : call to non-static member function // without an object argument // auto p4 = A::f; // Why not ok? } Why must I use address-of operator to get a pointer to a member function? 回答1: auto p1 = &f; // ok auto p2 = f; // ok The first is more or less the right thing. But because non-member functions have implicit conversions to pointers, the & isn't necessary. C++ makes

问题 Is there a standard that defines the syntax and semantics of assembly language ? Similarly as language C has ISO standard and language C# has ECMA standard? Is there only one standard, or are there more of them? I'm asking because I noticed that assembly language code looked different on Windows and Linux environment. I hoped that assembly language is not dependent on OS, that it's only language with some defined standard and via assembler (compiler of assembly language) is translated into

问题 All operations on "standard" signed integer types in C (short, int, long, etc) exhibit undefined behaviour if they yield a result outside of the [TYPE_MIN, TYPE_MAX] interval (where TYPE_MIN, TYPE_MAX are the minimum and the maximum integer value respectively. that can be stored by the specific integer type. According to the C99 standard, however, all intN_t types are required to have a two's complement representation: 7.8.11.1 Exact-width integer types 1. The typedef name intN_t designates a

问题 I came across an interesting comment in php.net about serialize data in order to save it into the DB. It says the following: Please! please! please! DO NOT serialize data and place it into your database. Serialize can be used that way, but that's missing the point of a relational database and the datatypes inherent in your database engine. Doing this makes data in your database non-portable, difficult to read, and can complicate queries. If you want your application to be portable to other

问题 Does the numbering of clauses, sections, subsections, paragraphs, etc., differ between the C++11 standard ISO/IEC 14882:2011 and the later, gratis-downloadable draft N3337? To be clear: my question is not whether it is advisable to use N3337 in place of the official standard, for that question has already been well answered on Stackoverflow; but only whether the numbering differs. For reference, here is the most nearly relevant non-Stackoverflow answer I find (if you follow the link, refer