I made my header file. If cpp file with definitions is in project compiler knows it has to be linked, but if it's not compiler doesn't know. If I include standard library or boost I don't have to manually link cpps. How to do so including my header automatically links cpp? Maybe problem is with something else?I use VS 2013.
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I recently noticed that I don't need to include the required header files inside header files that I have written myself. As as example, GLuint is defined using typedef unsigned int GLuint; inside glew.h. If I create a sample.hpp header file and mention GLuint without including glew.h, the compiler automatically works out that there is a typedef in glew.h. However, if I mention GLuint in a source file the compiler starts to complain. I have seen this happen in VS 2010 and 2013.
Edit: I should have mentioned that I am not including any other header files so I'm not indirectly including glew.h
In case you need to look at the code:
#ifndef CP_SHADER_LOADER_H
#define CP_SHADER_LOADER_H
namespace cp {
[Code].....
I am having the issue of trying to call functions of a class through the header file.
Test.h
#ifndef TEST_H
#define TEST_H
class Test {
public:
void Hello();
[code]....
This code returns the error "undefined reference to 'Test::Hello()'"
All I am trying to do is call the Hello(); function in a seperate file.
I have a libcx3d.a which contains my VrmlParser class and other classes which are used by VrmlParser. I have a main.cpp which does this :
VrmlParser vp = new VrmlParser();
double **VOB = vp.getVOB();
When I compile using g++ main.cpp -o main -L. -lcx3d, I get the following errors :
'VrmlParser' was not declared in this scope.
expected ';' before vp.
'vp' was not declared in this scope.
There is a header file called "VrmlParser.h" in the static library. Should I include this header file in main.cpp ? If so, will include "VrmlParser.h" work ? I have the .a and .cpp in the same directory. I can't find the header file for the static library.
I have written my program and it works when I keep everything in the header files, and then have my main. I am now splitting them up into implementation files, but Eclipse keeps giving me errors. It gives me error at every opening brace of the constructor and functions. It says on all of them "Redefinition of (name of constructor or method), Previously declared here." What am I doing wrong, because it works in the header file?
#include "KeyValuePair.h"
template<typename Key,typename Value>
KeyValuePair<Key,Value>::KeyValuePair()
[Code] .....
I am working on an assignment in which i have to perform th following task
myClass itsObject1,itsObject2;
itsObject2=5000+itsObject1;
I have defined overloaded operator as follows in the header file but in the cpp file of the class it gives error.
friend vli &vli::operator + (int &a,vli &obj);
How to define it in cpp file of my class?
What is the right syntax for implementing the .cpp of a template class?
Consider this LinkedList.h file:
Code: #include<iostream>
#include"Iterator.h"
template <class T>
class LinkedList {
[Code] ....
How should the implementation for the LinkedList constructor, for example, should look like in the LinkedList.cpp file?
I tried this:
Code: #include "LinkedList.h"
template <class T>
LinkedList<T>::LinkedList<T>() {
// constructor
}
LinkedList<T>::~LinkedList<T>() {
// destructor
}
But the compiler wouldn't accept it.
lets say we have a valid class with full implementation, X. can this class be declared as forward in Y header file:
Code: class X;
class Y{
X* m_X;
}
but still be used as regular in the cpp file?
Code:
#include "Y.h"
#incldue "X.h"
T Y::function(){
m_X->doSomething();
}
visual studio prevents me from doing it , I wonder if the standard also says so.
I wanted to share the value of a variable from Sender Program to Receive after program and want to calculate difference between send and receive. After studying Header file concept I program following three.
Now I am struck. How to to compile? I link all these file. I used following method:
Code:
gcc Sender.c -o Sender Sender.h
gcc Receiver.c -o Receiver Student.h
Then I run Sender and after that Receiver.I per my knowledge, Receiver should give difference but it gives error :
Code:
Receiver.c: In function "main":
Receiver.c:10:42: error: "Send" undeclared (first use in this function)
printf(" Total Receive is %d
",Receive-Send);
Code:
Sender.c
#include <stdio.h>
int Send ;
void main(){
[Code] ....
I have been working a project in C++. I have TTTMain.cpp file that has all the function calls, TTTFuntions.cpp that has all the functions, I have TTT.h file that has all the prototypes and variables and additionally I have Winner.h that has enum class Winner declaration in it. Here is my block of codes:
Winner.h file:
#ifndef winner
#define winner
enum class Winner {
[Code]....
My question is when I compile this gives me error on
Winner gameSquares[] = { Empty, Empty,Empty, Empty, Empty, Empty, Empty, Empty, Empty };
with saying "invalid use of non-static data data member" and It says "Empty was not declared in this scope."
I know calling enum is very very trick.
I am beginner in c++ language. i'm use visual studio 2010 ultimate. the problem is i can't add c++ file(.cpp) and header file(.h).
Here the screenshot : [URL] ....
My socket.cpp program got error. it showed "socket.h: no such file or directory". I had put my header file (socket.h) in the same place with my source file.
View 1 Replies View RelatedI am using the OpenCV library (2.3.1-7) and Qt-Creator (2.4.1) and I have this simplified piece of code that reads in an image as cv::Mat and then applies the OpenCV function pyrDown to the cv::Mat.
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/gpu/gpu.hpp"
using namespace std;
using namespace cv;
int main()
[code]....
This piece of code runs just fine and puts out the two different images as exected.
What I need to do now is to retrieve the source code of the "pyrDown"-function and then modify it according to the needs of the project that I am working on.
If I comment out the following line
//#include "opencv2/gpu/gpu.hpp"
then this results in the following error message:
'pyrDown' was not declared in this scope.
Apparently, pyrDown only works if #include "opencv2/gpu/gpu.hpp" is included in my code. Therefore the header of pyrDown should be included in this file, correct?
I am using Qt-Creator and the tooltip text for "pyrDown" is as follows:
"void pyrDown(InputArray src, OutputArray dst, const Size &dstsize=Size())"
Therefore, when i checked the file "/usr/include/opencv2/gpu/gpu.hpp" (which is the complete path to the file), looking for the headers of "pyrDown" I expected to find a matching header.
But instead, I only found this:
//! smoothes the source image and downsamples it
CV_EXPORTS void pyrDown(const GpuMat& src, GpuMat& dst, Stream& stream = Stream::Null());
struct CV_EXPORTS PyrDownBuf;
CV_EXPORTS void pyrDown(const GpuMat& src, GpuMat& dst, PyrDownBuf& buf, Stream& stream = Stream::Null());
[code]....
Those are all the lines of code where the character string "pyrDown" is included.To me, being rather a newbie, it is kind of strange that there is no header that matches the call of the function as it was included in my simplified code example at the very top of this post.
What I would like to understand is the following:
1) Is the file gpu.hpp really the one that stores the header that is used for the call in my code example? If so, I would like to understand why this is the case, since the data types of the parameters seem not to match (eg "GpuMat&" vs. "InputArray"). In gpu.hpp there are other files included, using the "#include"-command, but a text search in those files did not find any strings like "pyrDown" in any of them.
2) If gpu.hpp is not the header file that I am looking for, which one is the correct one and where can I find it?
3) The most important part for me is: Where can I retrieve the corresponding .cpp file for pyrDown, since this is crucial to the progress in my project. I have googled a lot and I found lots of .cpp files that were named "pyrDown.cpp" (example: [URL]), but none of them seems to be the one that I am looking for since either the data types in the header are not in accordance with what I expect or there are #include commands for files that I do not have available on my machine. And I assume that any .cpp-file that tries to use files that are not on my computer can not be the one that is used for the call in the code example at the top of this post.
1. Write a program the calculates the volume of a sphere.
Use a define to set Pi to 3.14 and a macro for the formula for the sphere.
V = 4/3PiR3.
In main ask for the radius (R).
Pass it to a function where you calculate the volume and return it to main and print the volume in main.
Use float values. (Save this program as you'll need it later.)
Code:
#include<stdio.h>
void fun (float);
main()
[Code].....
Can we put using namespace std; in a header file? Someone told me not to do it, but I don't know why...
View 2 Replies View RelatedI need read a file with header and I wanna print the file in output. How can I do that? I tried but not work..
#include<iostream>
#include<fstream>
using namespace std;
int main()
{
[Code]....
All i want to do is modify a header of a file(.exe file). I just want to do if for fun and see what I can do with it.
View 3 Replies View RelatedI have a class Myclass (for the sake of the example). I have a header file 'space.h', which is following:
#include "Myclass.h"
struct Files {Myclass* new_object, int number};
But turns out in the Myclass.h, I need the struct Files, like so:void function(vector<Files> arrangement);
So I would have to include "space.h" in the Myclass.h, but this way there's going to be a double definition of struct Files, since Myclass.h includes space.h and space.h includes Myclass.h.
Any good/solid example on how to create a header file?
View 2 Replies View RelatedI have written code for a timer. with everything and i want to include this so i dont need to write or copy the reqd code each time. how do i do this?
View 9 Replies View RelatedI wrote a simple date class and could not get it to work until I put all the code in main(). Then it worked like a charm. I have not been able to create a separate .cpp file and get it to work with my existing main().
I tried to follow [URL] which is a closed article, with no success. I tried every combination I could think of and was unable to compile without error. (Linux Mint 17,code::blocks 13.12, G++ 4.8.2). I did finally get it to work by putting *all* my code in the .h file and #including the .h file (and nothing else) in the .cpp file. This is not how it's supposed to work.
This is unbelievable! I just tried this on another computer, same OS same version of Code::Blocks and G++.
I am trying to compile two programs using the same header file and definitions. makefile part to make this work.
================================
My headerfile looks like this:
#ifdef ONE
void hello(int s);
#else
[Code]....
How can I include the flag -DONE in my makefile so that
it includes void hello(int s); for "one" and
int pin;
int verification(char* name);
for "two"
Here is my code
#include<msp430.h>
#include<stdio.h>
#include "contiki.h"
#include "isr_compat.h"
#include "string.h"
char dest[20]; //Global Variable
void uart0_send_data() {
[Code] ....
This code is used to transmit and receive the data. My only concern as of now is to create a header file for uart0_init() function.
I am trying to include a function from a header file named headerfunt.h . The code of my header file is
Code:
#ifndef HEADERFUNCT_H_INCLUDED
#define HEADERFUNCT_H_INCLUDED
#include <iostream>
[Code]....
But, while compiling it says abs was not declared... I have included the file.
I have written a small program for a class to convert decimal to binary and the program itself works, however, I am storing the binary bits in a stack that is in a header file (which I have used successfully before). It appears to push the bits to the stack just fine, however, when I use the printStack function I get a segmentation fault.
Here is the stack.h header file:
Code:
#include <stdlib.h>
#include <stdio.h>
struct stackNode {
int data;
struct stackNode *nextPtr;
[Code].....
And here is the main program that does the conversion:
Code:
#include <stdio.h>
#include "stack.h"
int binary (int x);
int main() {
int choice = 0;
printf("
[Code].....
One other thing of note, whenever I try to modify the printStack function, that function then seems to not work at all.
I'm trying to split up my game (about 1300 lines) into header files, but I'm coming up with a problem whenever I try and put a function in a header file, when that function was modifying some variables that were defined before int main in the .cpp. For example:
int variable1 (0);
int variable2 (0);
void increasevariables() {
variable 1 = variable1 + 1;
variable2 = variable2 + 1;
[code].....
If it only modified one variable then I could just pass that variable and the return it:(return variable1 + 1;)But I don't know how to make a function in a header file modify several pre-existing variables. In the actual program, the variables are dependant on each other and the modifying is a lot more complicated, so I'd rather not split it into several functions and run one at a time if there's another way.
