global-scope

Declaration found during unqualified name lookup

由 折月煮酒 提交于 2020-02-05 07:06:07
问题 Consider the following simple example: #include <iostream> int a=5;//1 extern int a;//2 int main(){ cout << a; } The standard said that (sec. 3.4/1): Name lookup shall find an unambiguous declaration for the name and (sec. 3.4.1/1): name lookup ends as soon as a declaration is found for the name. Question: What declaration (1 or 2) will be found in my case and why? 回答1: That clause says that name lookup stops when it hits int a=5; There is only one name here, a in the global namespace. It's

File Scope and Global Scope: C & C++

由 跟風遠走 提交于 2019-12-18 02:41:09
问题 I am a student and I am confused about global and file scope variables in C and C++. Is there is any difference in both perspectives? If yes, please explain in detail. 回答1: A variable with file scope can be accessed by any function or block within a single file. To declare a file scoped variable, simply declare a variable outside of a block (same as a global variable) but use the static keyword. static int nValue; // file scoped variable float fValue; // global variable int main() { double

CodeIgniter login across all pages

由 99封情书 提交于 2019-12-11 06:06:52
问题 I'm am very new to CI the MVC model. I have a simple page which is made of up 3 views. Header, Content and Footer. The content will be unique across the site but header and footer will be the same, no matter what page. In my header I have a login form. So there will be a login form across the whole site. since it appears on every page which has diff models: how will or where will I write the script for logging in a user as I don't fancy writing a login script on every model the header is used

node.js - configure node to load functions into the global scope?

由 自作多情 提交于 2019-12-07 12:49:49
问题 in realier days I saw somewhere that we can configure node-js to execute a loaded module in the global scope, I can't find how to do that now. Why I'm asking? I have some legacy files that define language utilities that I want to use on both the server and on the client, however many of these utilities are defined as global scope functions. For example, I have functions like closure(fClosure) , module(fModule) , and many more that simply organize your code in readable definitive way, and

How to declare at beginning of program

由 ￣綄美尐妖づ 提交于 2019-12-04 05:43:23
问题 In the listing below, an attempt to declare the rectangle "r" before the main() function is called results in an error. error: 'r' does not name a type r.x = 150;<br> Why must "r" be declared after main()? #include <SDL2/SDL.h> int main (int argc, char** argv) { // Creat a rect at pos ( 50, 50 ) that's 50 pixels wide and 50 pixels high. SDL_Rect r; r.x = 150; r.y = 150; r.w = 200; r.h = 100; SDL_Window* window = NULL; window = SDL_CreateWindow ("SDL2 rectangle", SDL_WINDOWPOS_UNDEFINED, SDL

How to declare at beginning of program

由 自作多情 提交于 2019-12-02 10:22:43
In the listing below, an attempt to declare the rectangle "r" before the main() function is called results in an error. error: 'r' does not name a type r.x = 150;<br> Why must "r" be declared after main()? #include <SDL2/SDL.h> int main (int argc, char** argv) { // Creat a rect at pos ( 50, 50 ) that's 50 pixels wide and 50 pixels high. SDL_Rect r; r.x = 150; r.y = 150; r.w = 200; r.h = 100; SDL_Window* window = NULL; window = SDL_CreateWindow ("SDL2 rectangle", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 640, 480, SDL_WINDOW_SHOWN ); // Setup renderer SDL_Renderer* renderer = NULL;

File Scope and Global Scope: C & C++

由 风流意气都作罢 提交于 2019-11-28 23:34:19
I am a student and I am confused about global and file scope variables in C and C++. Is there is any difference in both perspectives? If yes, please explain in detail. A variable with file scope can be accessed by any function or block within a single file. To declare a file scoped variable, simply declare a variable outside of a block (same as a global variable) but use the static keyword. static int nValue; // file scoped variable float fValue; // global variable int main() { double dValue; // local variable } File scoped variables act exactly like global variables, except their use is

ViewState Vs Session … maintaining object through page lifecycle

由 醉酒当歌 提交于 2019-11-28 05:15:43
Can someone please explain the difference between ViewState and Session? More specifically, I'd like to know the best way to keep an object available (continuously setting members through postbacks) throughout the lifecycle of my page. I currently use Sessions to do this, but I'm not sure if it's the best way. For example: SearchObject searchObject; protected void Page_Load(object sender, EventArgs e) { if(!IsPostBack) { searchObject = new SearchObject(); Session["searchObject"] = searchObject; } else { searchObject = (SearchObject)Session["searchObject"]; } } that allows me to use my

ViewState Vs Session … maintaining object through page lifecycle

由 ☆樱花仙子☆ 提交于 2019-11-27 00:51:39
问题 Can someone please explain the difference between ViewState and Session? More specifically, I'd like to know the best way to keep an object available (continuously setting members through postbacks) throughout the lifecycle of my page. I currently use Sessions to do this, but I'm not sure if it's the best way. For example: SearchObject searchObject; protected void Page_Load(object sender, EventArgs e) { if(!IsPostBack) { searchObject = new SearchObject(); Session["searchObject"] =
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