Constant template parameter class manages to link externally

I have a class foo with an enum template parameter and for some reason it links to two versions of the ctor in the cpp file.

enum Enum
{
    bar,
    baz
};

template <Enum version = bar>
class foo
{
public:
    foo();
};

// CPP File
#include "foo.hpp"

foo<bar>::foo() { cout << "bar"; }
foo<baz>::foo() { cout << "开发者_如何学编程baz"; }

I'm using msvc 2008, is this the standard behavior?

Are only type template parameters cannot be linked to cpp files?

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You are specializing both forms of the contstructor. Why are you surprised it links both forms in?