Unresolved external symbol on used defined namespace

Hi all!

I have a bit of a problem and Google isn't helping me

I'm trying to implement a namespace, let's call it test.

When i code my program like in the example below, it compiles, links and works fine.

Main.cpp

Code:

namespace test
{
	void foo(void)
	{
		return;
	}
}

int _tmain(int argc, _TCHAR* argv[])
{
	test::foo();
	return 0;
}

When i try to move the namespace to separate .h/.cpp files, like the ones below, the linking fails.

Test.h

Code:

namespace test
{
	void foo(void);
}

Test.cpp

Code:

void test::foo(void)
{
	return;
}

Main.cpp

Code:

int _tmain(int argc, _TCHAR* argv[])
{
	test::foo();
	return 0;
}

Compiler output
1>Compiling...
1>stdafx.cpp
1>Compiling...
1>Test.cpp
1>Main.cpp
1>Linking...
1>Main.obj : error LNK2001: unresolved external symbol "void __cdecl test::foo(void)" (?foo@test@@YAXXZ)
1>***\Visual Studio 2008\Projects\Test\Debug\Main.exe : fatal error LNK1120: 1 unresolved externals

What am i doing wrong? Any help is greatly appreciated!

Thanks!

Originally Posted by Quasar

Test.cpp

Code:

void test::foo(void)
{
	return;
}

Should be:

Code:

namespace test
{

    void foo(void)
    {
	return;
    }

}

I don't think that that is the problem: I recall that such qualification when defining the function is fine, and a quick test confirmed my memory.

More likely Test.cpp simply was not compiled and/or linked.

Forget it, i'm an idiot...

I just realized i was defining an inline function within the .cpp file and not the .h file. Moving the function to the correct place solved it.

Oops...

If it is an inline function in a header file it should most probably be:

Code:

namespace test
{
    inline void foo(void)
    {
        return;
    }
}

Or you may get "multiple definitions" errors later on when more than one file includes it.