Class and C++

Hi everyone,

I'm brand new developer with NiosII and C++, and I'm experiencing some problems with NiosII IDE, expecially in building application in C++.

I created a classe called "thread". I wrote 2 files, an simple header file thread.h and a cpp file, thread.cpp.

During building, I receive this error message:

Compiling thread.cpp...

../thread.cpp:10: error: new types may not be defined in a return type

../thread.cpp:10: error: return type specification for constructor invalid

../thread.cpp: In member function `void thread::begin()':

../thread.cpp:16: error: `TIMER_BASE' undeclared (first use this function)

../thread.cpp:16: error: (Each undeclared identifier is reported only once for each function it appears in.)

../thread.cpp:16: error: expected primary-expression before ')' token

../thread.cpp: In member function `void thread::end()':

../thread.cpp:26: error: `TIMER_BASE' undeclared (first use this function)

make: *** [obj/thread.o] Error 1

code listed below: thread.h

# ifndef _THREAD_H_# define _THREAD_H_

# define TIMEOUT# define TIME# include "altera_avalon_timer_regs.h"

class thread

{

public:

int state;

int ticks;

thread();

~thread();

void begin();

void end();

int getState();

}

# endif //_THREAD_H_

code listed below: thread.cpp

# include <system.h>

# include "thread.h"# include "altera_avalon_timer_regs.h"

void thread::thread() {}

void thread::~thread() {}

void thread::begin(void)

{

// inizializzazione timer e partenza

IOWR_ALTERA_AVALON_TIMER_PERIODL(TIMER_BASE, TIME);

IOWR_ALTERA_AVALON_TIMER_PERIODH(TIMER_BASE, 0x00);

IOWR_ALTERA_AVALON_TIMER_CONTROL(TIMER_BASE, 0x07);

state = 1;

ticks = 0;

}

void thread::end(void)

{

// terminazione timer

IOWR_ALTERA_AVALON_TIMER_CONTROL(TIMER_BASE, 0x0b);

state = 0;

}

int thread::getState(void)

{

return state;

}

So, I don&#39;t understand where are the problems:

1. What does it mean "new types may not be defined in a return type"?

2. Why TIMER_BASE is unknown, although is defined in <system.h> header file?

Someone can help me? Thanks.

G.