local

问题 As local variables are also called automatic variables, and are supposed to be allocated memory at run time, when function is accessed. int main(){ int a; // declaration return 0; } int main(){ int a[]; // compilation error, array_size missing return 0; } int main(){ int a[2]; // declaration, but can't work without array_size, // so at compile time it is checked! return 0; } My question is whether it's just a rule to give array_size in declaration in C, or memory is allocated at compile time

问题 As local variables are also called automatic variables, and are supposed to be allocated memory at run time, when function is accessed. int main(){ int a; // declaration return 0; } int main(){ int a[]; // compilation error, array_size missing return 0; } int main(){ int a[2]; // declaration, but can't work without array_size, // so at compile time it is checked! return 0; } My question is whether it's just a rule to give array_size in declaration in C, or memory is allocated at compile time

问题 I have a problem since two days; I want read a local JSON from my public folder on my React application created with react-app. This is my project structure: public data mato.json (my .JSON file) src components App.js Why I put my file in public folder? If I build my project with file in src folder, my file will be include in the generated main.js by the command yarn build . I want modify my json file without always rebuild my app. So I can't use code like: import Data from './mato.json' …or:

问题 I have a problem since two days; I want read a local JSON from my public folder on my React application created with react-app. This is my project structure: public data mato.json (my .JSON file) src components App.js Why I put my file in public folder? If I build my project with file in src folder, my file will be include in the generated main.js by the command yarn build . I want modify my json file without always rebuild my app. So I can't use code like: import Data from './mato.json' …or:

问题 Making an unknown friend template<typename T> class List { protected: class a { int x; int y; private: friend class b; // <------------ Why this is not an error? }; template <typename U > class b { //If that is not a error this should be an error int z; U y; }; public: List() { a* ptr = (a *)new unsigned char[sizeof(a)]; } }; int main() { List<int> mylist; } Please go through this link, I have my questions as comments in the code. I am trying to make another class a friend of my class. But

问题 So I basically do this. OObjectDatabaseTx result = OObjectDatabasePool.global().acquire( "local:orientdb", "admin", "admin"); //dostuff result.close; The problem is that when I redeploy my webapp (without restarting the Java EE container) I get the folling error: com.orientechnologies.orient.core.exception.OStorageException: Cannot open local storage 'orientdb' with mode=rw which I interpret to mean "Tomcat still has a filelock from the last app". So my question is how do I cleanly exit in

问题 For some reason some devices fail to convert a string to a date. This is my date converting code: func dateFromString(string: String) -> Date? { let f = DateFormatter.init() f.dateFormat = "yyyy-MM-dd HH:mm:ss" return f.date(from: string) } Now, through my analytics platform I capture when this return nil. I have no clue why so. I assume it has something to do with local and maybe timezone or 12/24h settings but I can't figure out what is the problem. More Details... I have tracked the

问题 For some reason some devices fail to convert a string to a date. This is my date converting code: func dateFromString(string: String) -> Date? { let f = DateFormatter.init() f.dateFormat = "yyyy-MM-dd HH:mm:ss" return f.date(from: string) } Now, through my analytics platform I capture when this return nil. I have no clue why so. I assume it has something to do with local and maybe timezone or 12/24h settings but I can't figure out what is the problem. More Details... I have tracked the

问题 My client wants a website that includes importing CSV data WITHOUT it being hosted on a server. The idea is so that their sales people can demonstrate their products without having web access or hosting set up on their PCs. They will also be able to update the data by exporting a new CSV file from the original Excel document, without any knowledge of HTML or Javascript. I've found quite a few solutions online - like Papa Parse (http://papaparse.com/) but all of them require the user to select

问题 Is there anyway that I can save or access a local variable outside of it's function? Consider the code below: $( "#droppable2" ).droppable({ activeClass: "ui-state-hover", hoverClass: "ui-state-active", accept: "#draggable3", drop: function( event, ui ) { jdc = $(this).attr("id"); //I need to use this value later $( this ) .addClass( "ui-state-highlight" ); var x = ui.helper.clone(); x.appendTo('body'); var jdi = $("img").attr("id");// I need to use this value later $(this).droppable(