Programming

#include <iostream.h>

class test
{
private:
int i;
public:
inline test(int m)
{
i = m;
}
inline int get_i()
{
return i;
}
};

int main()
{
test * a = new test(2);
cout << a->get_i();

return 0;
}

I compiled it in linux or solaris, there are always errors like:

In file included from /usr/local/include/c++/3.2/backward/iostream.h:31,
from test.cpp:1:
/usr/local/include/c++/3.2/backward/backward_warning.h:32:2: warning: #warning This file includes at least one deprecated or antiquated header. Please consider using one of the 32 headers found in section 17.4.1.2 of the C++ standard. Examples include substituting the <X> header for the <X.h> header for C++ includes, or <sstream> instead of the deprecated header <strstream.h>. To disable this warning use -Wno-deprecated.
Undefined first referenced
symbol in file
operator new(unsigned) /var/tmp//cc3t8EU3.o
std::basic_ostream<char, std::char_traits<char> >:perator<<(int)/var/tmp//cc3t8EU3.o
operator delete(void*) /var/tmp//cc3t8EU3.o
std::cout /var/tmp//cc3t8EU3.o
std::ios_base::Init::~Init [in-charge]()/var/tmp//cc3t8EU3.o
std::ios_base::Init::Init[in-charge]()/var/tmp//cc3t8EU3.o
__gxx_personality_v0 /var/tmp//cc3t8EU3.o
ld: fatal: Symbol referencing errors. No output written to a.out
collect2: ld returned 1 exit status




I seems that new operator can not be found. But even if changed the
#include <iostream.h>
with
#include <new>
#include <iostream>
using namespace std;

it does not work either.

Is there anybody who can give me some information to solve the problem ?

Thanks

here is the error information using the linux gcc compilor.


In file included from /usr/include/c++/3.3.3/backward/iostream.h:31,
from test.cpp:4:
/usr/include/c++/3.3.3/backward/backward_warning.h:32:2: warning: #warning This
file includes at least one deprecated or antiquated header. Please consider usin
g one of the 32 headers found in section 17.4.1.2 of the C++ standard. Examples
include substituting the <X> header for the <X.h> header for C++ includes, or <s
stream> instead of the deprecated header <strstream.h>. To disable this warning
use -Wno-deprecated.
/cygdrive/c/DOCUME~1/Owner/LOCALS~1/Temp/ccLpbKDg.o(.text+0x27):test.cpp: undefi
ned reference to `operator new(unsigned)'
/cygdrive/c/DOCUME~1/Owner/LOCALS~1/Temp/ccLpbKDg.o(.text+0x52):test.cpp: undefi
ned reference to `std::cout'
/cygdrive/c/DOCUME~1/Owner/LOCALS~1/Temp/ccLpbKDg.o(.text+0x57):test.cpp: undefi
ned reference to `std::basic_ostream<char, std::char_traits<char> >:perator<<(
int)'
/cygdrive/c/DOCUME~1/Owner/LOCALS~1/Temp/ccLpbKDg.o(.text+0x83):test.cpp: undefi
ned reference to `std::ios_base::Init::Init[in-charge]()'
/cygdrive/c/DOCUME~1/Owner/LOCALS~1/Temp/ccLpbKDg.o(.text+0x9e):test.cpp: undefi
ned reference to `std::ios_base::Init::~Init [in-charge]()'
collect2: ld returned 1 exit status

This is working fine with me :

--------------------------------------
*****************************
#include <iostream>
using namespace std;

class test
{
private:
int i;
public:
inline test(int m)
{
i = m;
}
inline int get_i()
{
return i;
}
};

int main()
{
test * a = new test(2);
cout << a->get_i();
return 0;
}

*****************************
--------------------------------------

I compiled the code using g++ compiler on solaris.

Also there is no need to specify methods as inline, if you are defining the method inside class declaration. By default it becomes inline.

use g++ instead of gcc.