Linking static library including template

[Roland Raschke]

Hi,
I'm a novice in using templates and want to write a static library
with some communication classes. One of these classes uses two
instances of a ringbuffer template as class members:

template <class T> class CRingBuffer
{
public:
...
bool PutData( const T& value );
...
};

typedef CRingBuffer<unsigned char> tByteFIFO;
class CCommDriver
{
...
tByteFIFO m_RxRing;
...
};

I can compile and link this library without errors, but if want to use
the class CCommDriver in an application the linker returns errors for
any used member function of CRingBuffer, i.e.:
error LNK2001: Unresolved external "public: bool __thiscall
CRingBuffer<unsigned char>:utData(unsigned char const &)"
What's the problem? I think the compiler should create the necessary
template code for unsigned byte because it is used inside the
CCommDriver class...

Thanks for your help!

Regards,
Roland

 

[Kevin Goodsell]

Hi,
I'm a novice in using templates and want to write a static library
with some communication classes.

"Static library" is not something that is defined as part of C++. If
you're having a problem with that, the appropriate place to ask is a
group that discusses your implementation. comp.lang.c++ only discusses
the C++ language itself.

I can compile and link this library without errors, but if want to use
the class CCommDriver in an application the linker returns errors for
any used member function of CRingBuffer, i.e.:
error LNK2001: Unresolved external "public: bool __thiscall
CRingBuffer<unsigned char>:utData(unsigned char const &)"

[34.14] How can I avoid linker errors with my template classes?
http://www.parashift.com/c++-faq-lite/containers-and-templates.html#faq-34.14

While you're at it:

[5.8] How do I post a question about code that doesn't work correctly?
http://www.parashift.com/c++-faq-lite/how-to-post.html#faq-5.8

-Kevin