C / C++ / MFC

• Qualify it with the std namespace specifier,
  e.g.
  C++

  #include <iostream>
  int main()
  {
    std::cout << "hi" << std::endl;
  }

• Take advantge of the using namespace std; statement,
  e.g.
  C++

  #include <iostream>
  using namespace std;
  int main()
  {
    cout << "hi" << endl;
  }

Vaclav_Sal wrote:

#include <iostream>
using namespace std;

Quote:

Shouldn't these two statements be in the project's stdafx.h file?

// some .h file
#if defined(SOME_TAG)
// statements to be included if SOME_TAG is defined
#endif

// main .cpp file
#define SOME_TAG // or not as the case may be
#include some .h file

// other code including blocks like ...
#if defined(SOME_TAG)
// statements to be included if SOME_TAG is defined
#endif

namespace std {

class TEST_CLASS_1 {
public:
TEST_CLASS_1();
virtual ~TEST_CLASS_1();

int TestFunction(void);
};

Extending the namespace std - cppreference.com[^]:

It is undefined behavior to add declarations or definitions to namespace std or to any namespace nested within std, with a few exceptions noted below

Vaclav_Sal wrote:

That is the way Eclipse builds the class when asked for "namespace".

#ifndef MY_DEBUG
#define MY_DEBUG
#endif

#define MY_DEBUG

#include <iostream>

#include <math.h> // rint round up math
#include <stdio.h>
#include <stdlib.h>

#include <fcntl.h>
//#include <sys/shm.h>
#include <sys/stat.h>
//#include <sys/mman.h>
//#include <unistd.h>
#include <math.h> // rint round up math
//#include "/usr/local/include/wiringPiSPI.h"

#include <math.h> // rint round up math libraray lm

using namespace std;

#include "stdafx.h"

//#include "flash_DTR.h" // flash DTR via USB port
/* CCC temp out
#include "AD9851.h" // AD9851 via SPI / I2C
#include "LCD_SPI.h" // LCD via SPI
*/

//#include "MY_wiringPi.h" // GPIO for RPi

//#include "LCD.h" // TEST CLASS
//#include "TESTCLASS.h" //
//#include "LCDSPI.h" // NO SPACE

#include "TESTCLASS1.h"

int main() {
cout << "NEW *** COPY 2 TEST output HF_VNA_CROSS_CPP CPP Managed project" << endl; // prints CPP Managed project

//temp bypass CCC
// class test block start
{
#ifdef MY_DEBUG
cout << " process code block START"<< endl;
cout << "*** TRACE file " << __FILE__<< endl;
cout <<" function " <<__FUNCTION__<<endl;
cout << " line " << __LINE__<< endl;
#endif
//LCD__SPI lcd; // double space INSTATIATE CLASS
//lcd.TestFunction();
TEST_CLASS_1 test_class;
test_class.TestFunction();

}
// class test block end
// */
return 43;

#ifdef MY_DEBUG
cout << "*** TRACE file " << __FILE__<<" line " <<__LINE__<< " function "<< __FUNCTION__ << endl;
//return 42;
#endif


//flash();
// process code block START
{
#ifdef MY_DEBUG
cout << " process code block START"<< endl;
cout << "*** TRACE file " << __FILE__<< endl;
cout <<" function " <<__FUNCTION__<<endl;
cout << " line " << __LINE__<< endl;
#endif
// process code block END
#ifdef MY_DEBUG
cout << " process code block END"<< endl;
cout << "*** TRACE file " << __FILE__<< endl;
cout <<" function " <<__FUNCTION__<<endl;
cout << " line " << __LINE__<< endl;
#endif
}

/* temp bypass CCC
// class test block start
{
LCD lcd; // INSTATIATE CLASS

//lcd.TestFunction(10);
}
// class test block end
*/
}

#ifndef TESTCLASS1_H_
#define TESTCLASS1_H_

#include "stdafx.h"

class TEST_CLASS_1 
{
    public:
        TEST_CLASS_1(){}
        virtual ~TEST_CLASS_1(){}

        int TestFunction(void){return 1;}
};

#endif 

Vaclav_Sal wrote:

I am sorry you went thru all this , but the issue is not in compiling.
The code just need those "redefinitions" to work, it compiles fine.

1. Running the preprocessor
   
2. Compiling the intermediate file created by the preprocessing to assembly code
   
3. Creating object files from the assembly code files
   

# Run the preprocessor and stop 
# The result is printed to stdout and redirected to a file
gcc -E example.c > example.i

# Compile passing the intermediate file and stop
# Creates assembly code file example.s
gcc -S example.i

# Compile passing the assembly code file and stop (do not link)
# Creates object file example.o
gcc -c example.s

gcc -save-temps -c example.c