about creating a library

[Rex_chaos]

Hi all,
I am trying to compile a simple source to a library(.a). My code has
been seperated into two parts, header file and implementation.

// header file NSPWin.hpp

#ifndef __TESTLIB_H_
#define __TESTLIB_H_

#include <iostream>
#include <string>

namespace NSP
{
class NSPWin
{
private:
std::string name;
unsigned int lineNo;

public:
NSPWin(std::string sname, unsigned LN);
std::string getName(void);

friend std:stream& operator<<(std:stream &stream, NSPWin e);
}; // end class NSPWin


//Here is the implementation NSPWin.cpp

#include "NSPWin.hpp"

class NSPWin
{
private:
std::string name;
unsigned int lineNo;

public:
NSPWin(std::string sname, unsigned LN):name(sname), lineNo(LN)
{};

std::string getName(void)
{
return name;
}

friend std:stream& operator<<(std:stream &stream, NSPWin e)
{
stream << "The name is " << e.getName() << std::endl;
return stream;
}
}; // end class NSPWin

For testing, I have also written another code test.cpp

#include <iostream>
#include <stdlib.h>

#include "NSPWin.hpp"


int main(int argc, char *argv[])
{ NSP::NSPWin test("testing...", 23);
return 0;
}

I am using g++ under MsWindow and succeed in compiling the source code
to a library (NSPLib.a)

However, when I compile test.cpp and link the libary, it reports error


[Linker error] undefined reference to
`NSP::NSPWin::NSPWin(std::string, unsigned)'

Please help me!!!

 

[Jack Klein]

Hi all,
I am trying to compile a simple source to a library(.a). My code has
been seperated into two parts, header file and implementation.

// header file NSPWin.hpp

#ifndef __TESTLIB_H_
#define __TESTLIB_H_

Your program is ill-formed from the line above. Identifiers beginning
with an underscore and an uppercase letter, or containing two
consecutive underscores anywhere within them, are reserved for the
implementation in all contexts. Why do you think you need to begin
this macro name with two underscores?

#include <iostream>
#include <string>

namespace NSP
{
class NSPWin
{
private:
std::string name;
unsigned int lineNo;

public:
NSPWin(std::string sname, unsigned LN);
std::string getName(void);

friend std:stream& operator<<(std:stream &stream, NSPWin e);
}; // end class NSPWin


//Here is the implementation NSPWin.cpp

#include "NSPWin.hpp"

class NSPWin
{
private:
std::string name;
unsigned int lineNo;

public:
NSPWin(std::string sname, unsigned LN):name(sname), lineNo(LN)
{};

std::string getName(void)
{
return name;
}

friend std:stream& operator<<(std:stream &stream, NSPWin e)
{
stream << "The name is " << e.getName() << std::endl;
return stream;
}
}; // end class NSPWin

For testing, I have also written another code test.cpp

#include <iostream>
#include <stdlib.h>

#include "NSPWin.hpp"


int main(int argc, char *argv[])
{ NSP::NSPWin test("testing...", 23);
return 0;
}

I am using g++ under MsWindow and succeed in compiling the source code
to a library (NSPLib.a)

However, when I compile test.cpp and link the libary, it reports error


[Linker error] undefined reference to
`NSP::NSPWin::NSPWin(std::string, unsigned)'

Please help me!!!

You will need to ask this question in a gcc or Windows programming
group. Building and linking libraries are completely implementation
specific, and not defined by the language at all, so it is off-topic
here.

--
Jack Klein
Home: http://JK-Technology.Com
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