Georg Teichtmeister wrote:
Hello!
We are developing a math - library for realtime applications and want to
use some given mathlibraries as base(ipp, MTL, .. ). Our library is a
wrapper for those and you should be able to select the underlying
library by template parameter. Therefore we split up our library in two
namespaces:
The first one defines namespace-global functions which call the
baselibrary functions. These are templatefunctio ns which some
spezialitions for double and float.
The second one defines classes, where the functions of the first
namespace will be called.
Now comes the problem: If I include our mathlibrary into two
compilationunit s the linker gives a error which says:
A.lo:in function Namespace1::ns_ globalfunction:
A.lo:multiple definition of ns_globalfuncti on
B.lo:first defined here
And this comes for every namespaceglobal template function of the first
namespace for every spezialition.
regards,
Georg
now I have a coding example which produces the error I have:
FILE: output.h
#include <iostream>
#ifndef TEST_H
#define TEST_H
namespace Test
{
template<typena me T>
void test(T output)
{
std::cout << output << std::endl;
}
template<> void test<int>(int output)
{
std::cout << "Int: " << output << std::endl;
}
}
#endif
FILE: class1.h
#include "output.h"
class class1
{
public:
class1();
};
FILE: class1.cpp
#include "class1.h"
class1::class1( )
{
Test::test<int> (13);
}
FILE: class2.h
#include "class1.h"
class class2 : public class1
{
public:
class2();
};
FILE: class2.cpp
#include "class2.h"
class2::class2( )
{
Test::test<unsi gned int>(34);
}
FILE: testTemplate.cp p
#include "class2.h"
int main(int argc, char** argv)
{
class1 c1;
class2 c2;
}
This is the error output from the linker:
class2.o: In function `void Test::test<int> (int)':
class2.o(.text+ 0x0): multiple definition of `void Test::test<int> (int)'
class1.o(.text+ 0x0): first defined here
testTemplate.o: In function `void Test::test<int> (int)':
testTemplate.o( .text+0x0): multiple definition of `void
Test::test<int> (int)'
class1.o(.text+ 0x0): first defined here
collect2: ld returned 1 exit status
Compiler: gcc-2.95.3
regards,
Georg
