Unresolved external symbol referenced in class template constructor (in VS 2008)

Question

The following MWE fails to compile in VS 2008

Bar.h

struct Bar
{
    Bar();
};

Bar.cpp

#include "Bar.h"

Bar::Bar()
{
}

Foo.h

#include "Bar.h"

template<typename T>
class Foo
{
public:
    Foo()
    {
    }

private:
    Bar m_bar;
};

main.cpp

#include "Foo.h"

int main()
{
    Foo<int> f;
    return 0;
}

Error message:

error LNK2019: unresolved external symbol "public: __thiscall Bar::Bar(void)" (??0Bar@@QAE@XZ) referenced in function "public: __thiscall Foo<int>::Foo<int>(void)" (??0?$Foo@H@@QAE@XZ)

However the same code successfully compiles in GCC 3.4.4 -- old compiler I know, but its currently the latest version that I've got on my machine. Is this code standard compliant or is this a VS 2008 bug?

Stupid question, but are you sure you added `Bar.cpp` to the project? — Anton Savin, Oct 06 '14 at 12:35

score 0 · Accepted Answer · answered Oct 06 '14 at 12:37

0

As long as Bar.cpp is also compiled and linked, the code is completely correct and this is a VC++-Bug. Check whether you've set up the project properly.

answered Oct 06 '14 at 12:37

Columbo

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Unresolved external symbol referenced in class template constructor (in VS 2008)

1 Answers1