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How to make a constant or variable accessible in entire program


How to make a constant or variable accessible in entire program

By : user2950591
Date : November 17 2020, 11:55 AM
To fix the issue you can do You really do not want to use that particular approach and include that code in all translation units. If you did each one would include two variables named desktopWidth and desktopHeight causing duplicate symbol errors during link time. It will also make it difficult to manage updating them if the size of the desktop changes after the application starts. If you really want to provide global variables holding the size of the desktop you should place them in a single .cpp file and place extern declarations in a single header file that is included when needed.
Header file (GlobalDesktopInfo.h)
code :
#ifndef GLOBALDESKTOPINFO_H
#define GLOBALDESKTOPINFO_H

extern int desktopHeight;
extern int desktopWidth;

#endif GLOBALDESKTOPINFO_H
#include "GlobalDesktopInfo.h"
int desktopHeight = 0;
int desktopWidth = 0;
#include "GlobalDesktopInfo.h"
// other includes

int main()
{
    QApplication app;

    QDesktopWidget desktop;
    desktopHeight = desktop.geometry().height();
    desktopWidth = desktop.geometry().width();

    // other code and initialization
}


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I need to make a variable accessible to the whole program in Java

I need to make a variable accessible to the whole program in Java


By : Technical Recruiter
Date : March 29 2020, 07:55 AM
will help you Try Singleton design pattern.
http://en.wikipedia.org/wiki/Singleton_pattern
Proper way to make variable accessible within entire .m file?

Proper way to make variable accessible within entire .m file?


By : Roy Dekker
Date : March 29 2020, 07:55 AM
hop of those help? You can add a class extension, and store the global data in ivar, like this:
code :
@interface MyClass() {
    GlobalData *globDat;
}
@end

@implementation MyClass

-(id) init {
    self = [super init];
    if (self) {
        globDat=[GlobalData getInstance];
    }
    return self;
}

@end
Can I make class accessible by the entire project?

Can I make class accessible by the entire project?


By : fady.ishak
Date : March 29 2020, 07:55 AM
wish helps you You didn't say is it a method but if it is then you could make static method (no need to create new class then) and then use it like Message.method(message, error code);. Or even add import static what gives you ability to do something like this: method(message, error code);.
How to make variables of one file accessible along the entire application?

How to make variables of one file accessible along the entire application?


By : user3097906
Date : March 29 2020, 07:55 AM
like below fixes the issue I have a Node REST API using Express and JavaScript. I created a Database class that is able to connect, disconnect and execute the queries. My app.js (the entry file) creates an instance database of this and launches the express server. On requests I have the following flow: ,
Use service architecture or dependency injection.
code :
root (directory)
|
|-->app.js
|-->controllers (directory)
|-->services (directory)
      |
      |-> DatabaseService.js
      |-> XYZService.js
      |-> index.js
var Database =  require('./DatabaseService')
var XYZ = require('./XYZService')

module.exports = {
    database: new Database(),
    xyz: new XYZ()
}
// SomeController.js
var database = require('../services').database

...
// DO WHATEVER YOU WANT WITH 'database' variable
...
api.get('/user/:id', function (req, res) { // <-- wrapping 
   var database = new Database()
   return yourRouteController(req, res, database) // <-- Inject your database instance here
})
What is the best way to create a constant, that can be accessible from entire application in VueJs ?

What is the best way to create a constant, that can be accessible from entire application in VueJs ?


By : DoubleD
Date : March 29 2020, 07:55 AM
help you fix your problem You can always define a variable outside of the Vue app scope and use it throughout the application.
However, if you are using any bundler like Webpack/Browserify/etc. you can do the same but you'd have to import it into every component using it. An example for that can be found below.
code :
//const.js
export default {
   c1: 'Constant 1',
   c2: 'Constant 2'
}

// component.vue
import const from './const';

export default {
  methods: {
    method() {
      return const.c1;
    }
  }
}
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