C/C++ :: Undefined Class Member Even Though It Is Defined?
Jan 2, 2015
I made this code (it does nothing I am just learning about classes, I was learning about friend functions) and I don't understand what is wrong, here is the code:
#include <iostream>
#include <cstdlib>
#include <cstring>
using namespace std;
class MyClass {
public:
friend int add(int a, int B)/>;
[Code] ....
I know i didn't need to include cstdlib and cstring for this code but as I said, it's not supposed to be something it's just for practice and I was working on char arrays. My question is about the part where i try to define the function:
int MyClass::add(int a, int B)/>
{}
My compiler(Microsoft Visual C++ 2010 Express) says that class MyClass has no member "add" even though it does...
My problem is that the storeElems member function is causing an error saying it is undefined, however there are no errors any where else in the program being reported. I have made several programs involving classes now, all with this three file format and this is the first time that a member function in the main file is being reported as undefined, so I'm not sure what to do.
I am modifying a set of static variables inside of the class's member function. The static variables are private. An example of what I'm doing is as below,
utilities.h ----------- class utilities { private: static int num_nodes;
public: void parse_details(char* );
[Code] ....
I get a compilation error in the function void utilities::parse_details(char* filename)
which says: undefined reference to `utilities::num_nodes'
vijay13@ubuntu:~/Downloads$ g++ -o test test.cpp -I /home/vijay13/Downloads/OGDF-snapshot/include/
I am getting following error:
vijay13@ubuntu:~/Downloads$ g++ -o test test.cpp -I /home/vijay13/Downloads/OGDF-snapshot/include/ /tmp/ccPE8nCu.o: In function `main': test.cpp:(.text+0x26): undefined reference to `ogdf::Graph::Graph()' ...................... so on
I have an odd compiling error. My base class is all delcared and read to go. But I could not figure out how to get my sub classes inherit from it. So I had to make everything public. Even inheriting using the protected inheritance thingy, still could not get them to inherit from that base class.
So I compiled the program, and no other class came back with an error. only my base class. Here is the base class:
#include <iostream> #include <string> using namespace std; class Bankaccount {
[Code] .....
The error I'm getting is saying:
error C2143: syntax error : missing ';' before 'using' Where is there anything needing a semicolon before using?
'Bankaccount' : 'class' type redefinition see declaration of 'Bankaccount'
Is it saying this because I don't have any private class members?
'Bankaccount' : base class undefined
But it is defined.
What is the issue with this class? And how can I get it to compile and run?
I am trying to write a game in C++ with SDL, and I have a class that allows me to handle events. The class is actually really simple: It takes the SDL_Event, then 2 variables from 2 different enum to determine for which Event and which Key should be checked, and then a variable that will be modified if the event happens. Here is the class
As of yet the variable only changes if the Left key has been released, it will be extended if the error has been solved.
Then, in my main.cpp file I define the Event and the EventParser as
SDL_Event event; EventParser<float> ep;
And in a loop, the parseEvent function is called like this: ep.parseEvent(event, ep.KeyUp, ep.LEFT, &xVariable);
However I get a linker error (not the first one I got when programming this game) error LNK2019: unresolved external symbol "public: void __thiscall EventParser<float>::parseEvent(union SDL_Event,enum EventParser<float>::EventType,enum EventParser<float>::KbdKey,float *)" (?parseEvent@?$EventParser@M@@QAEXTSDL_Event@@W4EventType@1@W4KbdKey@1@PAM@Z) referenced in function _SDL_mainC:UsersPrideRageDocumentsVisual Studio 2012ProjectsSDL_TestSDL_Testmain.objSDL_Template
I am working on a program that uses a class I created called Student. I want to be able to add different students to a Binary Search Tree, and use the student's gpa (grade point average) to compare students with each other and place them in the correct location in the Tree.
I am writing a program which is using SDL library. I have two different classes which one of them is Timer Class and the other is EventHandling Class.
I need to use some member functions and variables of Timer in some Eventhandling Class member functions, Although I want to define an object of Timer in int main {} and relate it to its member function that has been used in Eventhandling member function in order that it becomes easier to handle it, I mean that I want to have for example two objects of timer and two objects of Eventhandling class for two different users.
I do not know how to relate an object of a class from int main{} to its member function which is being used in another class member function.
So I have an ImageManager class, Board class, and Box class. In Board.h I can declare ImageManager imgr; and in Board's constructor I can use imgr and its functions and such. However, in Box.h when I try and declare ImageManager imgr; I get the error "cannot access member declared in class ImageManager". Both declarations are under private, and exactly the same, but one doesn't work. Also, is there a way to only have one instance of ImageManager?
I am a beginner with C++, taking a class right now. The lab this week is to create a user defined class and have it accesses in a separate .h header file from the main.
I think I'm finding my way through it, but I'm getting a complie error that makes no sense to me:
I am having compiling issues and am looking for an explanation as to what is causing the error and how to fix it. The declaration of 'g4vuplInstanceID' seems to be global in scope in my option, however I may be wrong.
Compiler Error: error: 'class myPhysListGeneral' has no member named 'g4vupInstanceID'
I mount a function (parameter - numeric vector; returns a string). However, this same function is used in several classes. To avoid that I keep duplicating the same code within these classes there is a way to do that as the code below?
std::string func( const vector<int> vec ) { //processamento return result; } class A {
If you are doing some big program, usually, how do you organize the files? Put the class and its member in head file, but where to declare non member functions and where to define them? I don't want to put them all in one cpp file. If not, how to make them visible to the main cpp file?
we have to make a Invoice class which has a function called computeInvoiceAmount() which multiplies the price and the quantitiy which are private member of the class.
