Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

Control Flow

2 (2.2%)

Arrays, Strings, Pointers, and References

8 (9%)

Functions

4 (4.5%)

Basic object-oriented programming

30 (33.7%)

A bit more advanced OOP (Composition, Operator overloading, Inheritance, Virtual Functions)

18 (20.2%)

Templates

8 (9%)

Other (Explain)

4 (4.5%)

Working with files?  (Streams)

15 (16.9%)

Total Members Voted: 89

[ILikePie]

I'm working in C++, and some of my cpp files are getting unwieldy.
Is there an way to split up a cpp into multiple parts?
My soul class is getting so long that I have finding functions in it even with a search function. (due to so many search results)

I figured using #include and multiple files would work, but there were issues with scope or something.

Any insight would be appreciated.

#include would be your best bet. Try breaking your classes up into smaller ones, it's all about organization.
You can cut the file up into bits, and then, in a Makefile, `cat a.cpp b.cpp c.cpp > tmp && g++ tmp && rm tmp`, but that's ugly.

[Outcast Orange]

What?

I don't know what that means.

[Supermikhail]

Anyway, on to importing. How do I import custom classes? I've got this so far, but it doesn't work.

Well, for what it's worth, I've just imported my first custom class in NetBeans. This involved, building the class, for it to have a jar, then adding the jar to the libraries of my project (although it might be only relevant to the NetBeans interface, and I've got no idea how you'd do it otherwise), and finally importing the class with the package name.

[lordnincompoop]

I'm working in C++, and some of my cpp files are getting unwieldy.
Is there an way to split up a cpp into multiple parts?
My soul class is getting so long that I have finding functions in it even with a search function. (due to so many search results)

I figured using #include and multiple files would work, but there were issues with scope or something.

Any insight would be appreciated.

What I've seen people do is forward declare all the functions that'll be needed in other .cpps and make that into a header to attach to the files, keeping all the juicy stuff in the actual .cpps.

[Virex]

Anyway, on to importing. How do I import custom classes? I've got this so far, but it doesn't work.

Well, for what it's worth, I've just imported my first custom class in NetBeans. This involved, building the class, for it to have a jar, then adding the jar to the libraries of my project (although it might be only relevant to the NetBeans interface, and I've got no idea how you'd do it otherwise), and finally importing the class with the package name.

That's a bit of a roundabout way. If you've got the source code of the class, you can just make an additional class in the preferred package, copy the source code into said class and include said class (and package, via the using command, though if you're using netbeans it'll offer to solve that for you). Essentially the same method that you'd use when making your own classes, but this time you're stealing someone else's work
Doing it this way also makes it easier to extend or change the functionality of any custom classes, because you don't have to go back and build a new jar every time you change something.

[Supermikhail]

Anyway, on to importing. How do I import custom classes? I've got this so far, but it doesn't work.

Well, for what it's worth, I've just imported my first custom class in NetBeans. This involved, building the class, for it to have a jar, then adding the jar to the libraries of my project (although it might be only relevant to the NetBeans interface, and I've got no idea how you'd do it otherwise), and finally importing the class with the package name.

That's a bit of a roundabout way. If you've got the source code of the class, you can just make an additional class in the preferred package, copy the source code into said class and include said class (and package, via the using command, though if you're using netbeans it'll offer to solve that for you). Essentially the same method that you'd use when making your own classes, but this time you're stealing someone else's work
Doing it this way also makes it easier to extend or change the functionality of any custom classes, because you don't have to go back and build a new jar every time you change something.

Well, I don't know... I think it just feels cool that I can do this (roundabout way). And, well, you don't copy java.* classes into your code... err if you can.
Also, as I pretty much need to use the same class in the same implementation in two different applications... I don't think it would work your way.

[ILikePie]

Eww, Beans. Try using Emacs, it's great fun, and way cooler than all those shiny IDEs. Can your editor do this?

That's a bit of a roundabout way. If you've got the source code of the class, you can just make an additional class in the preferred package, copy the source code into said class and include said class (and package, via the using command, though if you're using netbeans it'll offer to solve that for you). Essentially the same method that you'd use when making your own classes, but this time you're stealing someone else's work
Doing it this way also makes it easier to extend or change the functionality of any custom classes, because you don't have to go back and build a new jar every time you change something.

Uh? I don't understand. Should I copy the source code into my .java file and use a using command? Currently I have them compiled at the same time, which... compiles. It gives me an error at run time though.

Code: [Select]

import libDib.*;
import java.io.File;

class Generator {
    public static void main(String[]args) {
    File file = new File("./image.dib");
    Canvas canvas =  new Canvas(64, 64, Draw.white);
    Bitmap DIB = new Bitmap (canvas);
    DIB.write(file);
          System.out.println("Ahem!");
    }
}

--------

ron@Tux ~/code/java $ java -jar Generator.jar
Exception in thread "main" java.lang.NoClassDefFoundError: Canvas
    at Generator.main(Generator.java:7)
Caused by: java.lang.ClassNotFoundException: Canvas
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
    ... 1 more



[Virex]

I think you'll need someone who knows Emacs better...

[Supermikhail]

Eww, Beans. Try using Emacs, it's great fun, and way cooler than all those shiny IDEs. Can your editor do this?

Can't watch that right now... but, I guess, I've got a thing for shiny IDEs. Probably because I was introduced to programming through a shiny IDE Delphi. Plus I just love how NetBeans handles component placing, like multiple grids to snap to - margin at the edge of the frame, several margins between components, edge alignment - just relaxing to look at. Although, I guess it could be counted as a form of procrastination.

[Virex]

You mean the GUI builder, right?

[Supermikhail]

Oh, yeah. I think a while back Ron specifically said that he liked Emacs for the transparency of the GUI manipulation, or maybe it was someone else.

[Siquo]

I figured using #include and multiple files would work, but there were issues with scope or something.

Any insight would be appreciated.

Nope, not as far as I know. I've got a Engine.cpp, Engine_init.cpp, Engine_event.cpp, Engine_loop.cpp and only one Engine.h for all of them. Just don't press F11 in Code::Blocks and it'll be fine.

[eerr]

Eww, Beans. Try using Emacs, it's great fun, and way cooler than all those shiny IDEs. Can your editor do this?

That's a bit of a roundabout way. If you've got the source code of the class, you can just make an additional class in the preferred package, copy the source code into said class and include said class (and package, via the using command, though if you're using netbeans it'll offer to solve that for you). Essentially the same method that you'd use when making your own classes, but this time you're stealing someone else's work
Doing it this way also makes it easier to extend or change the functionality of any custom classes, because you don't have to go back and build a new jar every time you change something.

Uh? I don't understand. Should I copy the source code into my .java file and use a using command? Currently I have them compiled at the same time, which... compiles. It gives me an error at run time though.

Code: [Select]

import libDib.*;
import java.io.File;

class Generator {
    public static void main(String[]args) {
    File file = new File("./image.dib");
    Canvas canvas =  new Canvas(64, 64, Draw.white);
    Bitmap DIB = new Bitmap (canvas);
    DIB.write(file);
          System.out.println("Ahem!");
    }
}

--------

ron@Tux ~/code/java $ java -jar Generator.jar
Exception in thread "main" java.lang.NoClassDefFoundError: Canvas
    at Generator.main(Generator.java:7)
Caused by: java.lang.ClassNotFoundException: Canvas
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
    ... 1 more



You need to import canvas into this class.

With java packages, they keep everything they need to run internal.

Otherwise just importing JFrames would bring in the canvas class, and a shitton of classes with subclasses. Which may not be what the developer wants.

[Outcast Orange]

I figured using #include and multiple files would work, but there were issues with scope or something.

Any insight would be appreciated.

Nope, not as far as I know. I've got a Engine.cpp, Engine_init.cpp, Engine_event.cpp, Engine_loop.cpp and only one Engine.h for all of them. Just don't press F11 in Code::Blocks and it'll be fine.

How do you have it set up?

Please tell me your secret, that would really help my productivity.

[qwertyuiopas]

What exactly are you having a problem with? If it's just getting multiple source files to work in general, it depends on your compiler and IDE (if you use one), if it is something worse, like splitting some large unsplitable thing like a massive class, though...