C :: Accessing Static Functions In Header Via Macro

May 11, 2013

Just wandering, will something like this work? header

Code:

#define func(arg) func_(arg) ...
static void func_(arg); code Code: #include "header"
int main()
{
func(arg);
}

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C++ :: Accessing Non-static Members Inside Static Member Functions

Sep 11, 2013

What are the workarounds for accessing the non-static member variables of some class(Say A) inside static member functions of another class(Say B)? I am coding in c++. Class A is derived with public properties of class B. Any pointers?

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C++ :: Linking To Static Library That Contains A Macro

Jul 16, 2014

I have built a static library that contains a macro. From a separate exe, I am calling this macro, but it doesn't work.

The compilation of the static library and that of the exe went okay.

Static lib contains just the macro definition.

Exe contains call to this macro.

Is there anything else that I need to do for this to work?

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C++ :: Do Static Functions Have Access To Non Static Data Members Of A Class

Apr 17, 2013

From my book:

"A static function might have this prototype:

static void Afunction(int n);

A static function can be called in relation to a particular object by a statement such as the following:

aBox.Afunction(10);

The function has no access to the non-static members of aBox. The same function could also be called without reference to an object. In this case, the statement would be:

CBox::Afunction(10);

where CBox is the class name. Using the class name and the scope resolution operator tells the compiler to which class Afunction() belongs."

Why exactly cant Afunction access non-static members?

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C++ :: Accessing Private Members From Header File

Dec 27, 2013

i have seen many c++ programs, where the private members from a header file are accessed in the source file. why is happening? As to my knowledge a private member cannot be accessed until it is friend function or member.

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C++ :: Accessing Data Declared Private Within Header File?

Feb 10, 2015

I have a header file that declares some fields as private, I then have a class that I need to compare two of the objects' information for equality but neither of them are the calling objects. I cannot alter the header file. How would I go about comparing private data fields? I will enter a brief bit of code for clarity.

Code: // Header File
// stuff.h

class stuff
{
private:
int* arr[20];
int size;
};
bool equal (const stuff& a, const stuff& b);

[code].....

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C++ :: Accessing A Vector That Was Created In A Separate Header File?

Oct 26, 2014

i have this vector:

#ifndef new_thing_Inventory_h
#define new_thing_Inventory_h
#include <vector>
#include <string>
using namespace std;
class Inventory {

[code]....

so i know i need to use .push_back or .pop_back, but the program im using dosn't even recognize that inventory is a created vector.

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C++ :: Undefined Reference Error When Accessing Static Variable Inside Member Function

Feb 10, 2013

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'

compiler: g++

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C++ :: Declare Static Variables In Header File

Oct 15, 2013

I read in another forum that it is bad practice to declare static variables in a header file? Is that true and if so why.

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C++ :: Accessing Class Functions In A Vector?

Jul 24, 2013

How I can use class functions in a vector. I have 2 classes:

Gamemode class
bullets class

Inside the Gamemode class I declared: vector<bullets> Bullet and bullets * b.

If the user presses the shoot button a new bullets class will be added to the Bullet vector:

b = new bullets;
Bullet.push_back(b)

Bow I'd like to check all objects in the Bullet vector for the collision() function inside the bullets class.

I already set up a for loop which counts from 0 to the end of the vector:

for( int i=0;i<Bullet.size;i++)
{
}

My idea was to do something like:

if(Bullet[i].collision()) then erase Bullet[i]

But that doesn't work...

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C/C++ :: Accessing Functions And Objects Within Class From Main

Apr 28, 2015

We are coding a Blackjack/21 game. I have a Deck.cpp class, Deck.h, Play.cpp (holds Main), and Card.h (holds card struct). I also have a Hand class/header, but I'm not using it yet. This is what is required per instructor.I am having issues accessing the functions that are in my Deck class. I have tried a few other means to access the class's function, but I've already gotten rid of those. These three are my latest attempts with the specific errors in the comment on the line the error was happening.
ve.

Here is my Deck.h

#pragma once
#include <iostream>
#include <fstream>
#include <string>
#include <cstdlib>
#include <ctime>
#include <iomanip>
#include "Card.h"
#include "Hand.h"
using namespace std;
class Deck

[Code]...

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C++ :: Accessing Private And Protected Member Functions Of Class?

Mar 30, 2013

how to access the private and protected member functions of the class.....

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C++ :: Undefined Reference To (method Name) When Accessing Method In Static Library

Jan 17, 2013

I've been trying for more than one month to access a method found in a library called libcocosnas_static.a. I'm using Cocos2d-X version 2.0.4. The library has been used many times by my company to make games using cocos2d-1.0.1-x-0.12.0 without any problem.

This is what I've done:
1- I added the include paths of the library to both eclipse and Android.mk
2- Included the .h file using #include "NASPlatformUtil.h"
3- Added the libcocosnas_static.a file to the proj.androidobjlocalarmeabi folder
4- Added "LOCAL_WHOLE_STATIC_LIBRARIES += cocosnas_static" to the Android.mk file
5- Called the function using: NASPlatformUtil:: openUrl("http://xxx.xxx.com/");

I can right click on the function, click Open Declaration and get it without any problem, but the compiler keeps on giving me that dreaded error...

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C++ :: Creating Header Files With Functions

Oct 30, 2014

I currently have a running program "game.cpp" that runs a game of tic tack toe. I want to split the working functions into header files so that game.cpp isn't so cluttered. I have created two header files "displayBoard.h" and "gamePlay.h" but they wont compile because the functions are looking for variables that haven't been declared. First, here's the working code.

#include "displayBoard.h"
#include <iostream>
#include <limits> //This is required to catch invalid user input
class ticTacToe //A class to contain all our functions {

[Code] .....

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C++ :: Undefined Reference To Header Functions For Hardware Programming

Jul 7, 2014

I am looking to program a digital to analog converter to output voltage on 12 of the available analog channels. I am an novice-intermediate programmer but cannot seem to solve a problem with undefined references.

I downloaded Measurement Computing's "DAQ" and "Instacal" programs to allow for the USB-3105 board to be recognized. Included with instillation is the Universal Library example programs for the USB-3105 DAC.

I am running windows 7 and using Code::Blocks with a GNU GCC compiler to try and run this sample program on the board. The program is also written in C/C++

When I load the VOut01.C file from the examples it reads:

/*VOut01.C****************************************************************

File: VOut01.C

Library Call Demonstrated: cbVOut()

Purpose: Writes to a D/A Output Channel.

Demonstration: Sends a digital output to D/A 0 until a key is pressed.

Other Library Calls: cbErrHandling()
cbFromEngUnits()

Special Requirements: Board 0 must have a D/A output port.

/* Include files */
#include <windows.h>
#include <stdio.h>
#include <conio.h>
#include "..cbw.h"

[Code] ....

Afterwards all three functions are declared as:

int EXTCCONV cbDeclareRevision(float *RevNum);
int EXTCCONV cbErrHandling (int ErrReporting, int ErrHandling);
int EXTCCONV cbVOut (int BoardNum, int Chan, int Gain, float DataValue, int Options);

The program Instacal in combination with the header file is supposed to recognize the "BoardNum" and allows for the "int Chan", "int Gain", "float DataValue", and all other subsequent dependent variables to exist.

However, I am still retaining these undefined reference errors even when I used Instacal to define the variables of the board (BoardNum, int Chan, ...ect) and added the full location of the header file.

My questions are:

-Why is this section of the header file dimmed after the endif statements?
-Is this reference problem a problem with the header files directory?
-Do the declarations of the function in the header file prevent them from being access due to their names and or symbolism?
-Why are the reference errors @4, @8, or @20, and what does this mean?

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C++ :: Define A Macro Within A Macro?

Feb 26, 2012

Is it possible to define a macro with in a macro? Any trick will do. I am trying to do quick conversion of cuda program to open mp by defining some macros at the top:

Code:
#define __syncthreads() #pragma omp barrier

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C/C++ :: Print Single Linked List Backward With Functions / Classes - Error Message Regarding Header Files

Oct 11, 2014

I'm trying to print a single linked list backward with functions/classes. I have created the main file and 3 header files. But I'm getting an error on one of the header files, linkedListIterator after adding #include "linkedListType.h". It says that "linkedLlistType.h" is calling itself. And when I try to run it, I get an error of "too many header files." I have tried changing the headers many times, but nothing seems to work.

.cpp file:

/*(Printing a single linked list backward) Include the functions reversePrint and recursiveReversePrint, as discussed in this chapter, in the class linkedListType. Also, write a program function to print a (single) linked list backward. (Use either the class unorderedLinkedList or the class orderedLinkedList to test your function.)*/

#include "linkedListType.h"
#include "orderedLinkedList.h"
#include "linkedListIterator.h"
#include <iostream>
using namespace std;
struct nodeType

[Code] ....

header files:
[URL] .... (error in this header file)
[URL] ....

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C# :: Static Method Inside Non-static Class

Aug 22, 2014

Have following code:

class Program
{
static void Main(string[] args)
{

[Code]....

My question according to what i just wrote:

1. Is that mean that Do() is only available for use by Dog itself because Dog is 'oryginal' Dog, and if i create new dogs - instances of oryginal Dog (dog1, dog2 ...) they cant access because Do is only available fo 'oryginal' one? Is that correct thinking?

2. If i would want to have something common (e.g value) for all dogs is that good way to create static field/method for Dog instead of non-static once then all instances of Dog would access Dog static member to get/change it? Just stupid example: static method GetAmountOfLegs() which return 4 Then all instances can take/call that value from Dog. Is that correct thinking?

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C :: Defining And Using A Macro

Jan 4, 2015

I am trying to create a small set of filepath functions that I intend to compile across linux and windows (I prefer not to use a big library). I want to have a global constant PATH_SEPARATOR that depends on the OS environment. This is what I set at the top of header file.

Code:

#include <stdio.h>
const char PATH_SEPARATOR =
#ifdef _WIN32
'';
#else
'/';
#endif I was hoping to test this while compiling this in a linux environment using gcc, thusly:

Code:

int main (int argc, char const* argv[])
}

[code]....

where apparently, I seem not to be able to "set" a part of the code to have "_WIN32" defined. I don't know if I explained this clearly.

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C++ :: Macro To Template?

Mar 22, 2013

I have this macro, that expands to some methods of my class:

Code:
#define POPULAR_COMBO_FILTRO_COM_BASE(classeTabela)
void VisualizadorLogsFrame::PopularComboFiltroCom ## classeTabela (bool limparTexto) {
long from, to;
m_cbxDetalhe->GetSelection(&from, &to);

[Code]...

but I get a compile error on this line:

Code:
for (list< CLASSE_TABELA *>::iterator linha = lista->begin(); linha != lista->end(); linha++) {

what am I doing wrong ? the error is:

VisualizadorLogsMain.h:174: error: expected ';' before 'linha'
VisualizadorLogsMain.h:174: error: 'linha' was not declared in this scope

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C :: Variadic Macro Function

Sep 12, 2013

I'm doing right now is creating a function that callocs (I prefer this to malloc) and returns a string, and it will work similar to printf, I'm calling the function alloCpy(),I have several values that I need in a malloced string, so I call Code: myAllocedString = alloCpy("Value 1 is %s, value 2 is %s, and value 3 is %d", str1, str2, num); To do this I'm using the Variadic Macro, the reason I'm not just using a Variadic Function such as this: Code: char* alloCpy(char *format, ...) {} is because I need to append NULL to the end for the sake of looping through arguments, and I'm understanding it thusfar, but I have a few issues, first of all, I tried defining the Macro in a header file, but when I try to call it I get the error "Undefined reference to alloCpy". Also, to loop through arguments to get string lengths I'm using va_arg(args, char*) which requires all the arguments to be of type char*. Here is my code:
myheader.h:

Code:

#define alloCpy(format, ...) _alloCpy(format, ##__VA_ARGS__, NULL);
char* _alloCpy(char *format, ...); mycfile.c: Code: char* _alloCpy(char *format, ...) {
va_list args;
va_start(args, format);
int args_len = 0;
}

[code]....

So, how can I do this to, first of all, make my macro function accessible from other files importing myheader.h, and second, how can I make it accept any type of argument like printf, so that my example above would work?

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C :: Testing If A Macro Is Defined To A Value?

Jan 16, 2015

Say I have something lke

Code:
#define FOO BAR
#if FOO == BAR
doX();
#else
doY();
#endif

This causes doX(); to be executed. But the intent is to have doY(); be run. I'm guessing this is because BAR is undefined and therefore blank, so blank equals blank. Is there some way to compare the symbol FOO was set to instead of its value, BAR?

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C++ :: Replacing Macro With Constant

Apr 4, 2013

I heard that const shall be preferred over #define . So I start to change my program accordingly.

But then below error message occurs during compilation:

#include "common.h"
#include "definition.h"
#include "particle.h"
int main() {
Particle *p = new Particle();

[Code] .....

I guess the error occurs because, when the line 9 of particle.h (File 4) is compiled, value of const int dimension is not seen by the compiler.

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C/C++ :: Migration Of Serialization Macro

Jun 12, 2014

I have to migrate C++ source which is compiled with MinGW-gcc to be compiled with VS2013, and have one issue with one macro used for serialization.

Here is macro:

#define IMPLEMENT_SERIALIZE(statements)
unsigned int GetSerializeSize(int nType, int nVersion) const
{
CSerActionGetSerializeSize ser_action;
const bool fGetSize = true;

[Code] ....

Here is place in code were it is call (in class declaration):

IMPLEMENT_SERIALIZE(({
if (!fRead) {
uint64 nVal = CompressAmount(txout.nValue);
READWRITE(VARINT(nVal));

[Code] .....

When compile received errors:

main.h(555): error C2059: syntax error : '{'
main.h(555): error C2143: syntax error : missing ';' before '{'
line 555 is end of macro call ( "})").

How should look using of this macro in order to avoid that errors?

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C++ :: Pitfalls Of Macro Substitution?

Dec 29, 2013

"If you examine the expansion of max, you will notice some pitfalls. The expressions are evaluated twice; this is bad if they involve side effects like increment operators or input and output. For instance, the below example will increment the larger twice."

#define max(A, B) ((A) > (B) ? (A) : (B))

max(i++, j++)/* WRONG */

I don't see what the problem is with the code above. i is incremented and j is incremented and then it performs a ternary operation to see which is greater. Am I missing something?

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C++ :: Two Projects - Defining Value Of Macro

Jun 27, 2012

Say I have two projects A and B. A depends on B. If project A defines a macro to be 100 and project B defines the same macro to be 200. In project A, if I use this macro, what value would this macro be? Let's just forget macro is evil for the time being. Let's also forget that it is not good to define the same macro twice for the time being.

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