Where are you defining your template, in the header or the source? You may
need to explicitly instantiate.
On 24 Jul 2015 13:31, "Edward Diener" <eldlistmaili...@tropicsoft.com>
wrote:
> Before attempting to reduce my code to a small enough example to post
> here in its entirety I will give a description of the problem to see if
> anyone has encountered it in general. The problem is purely a linker
> problem.
>
> I have an exported class in a shared library, called it XX in header
> file XX.hpp. From an executable's source file, called it YY.cpp I
> include the class's header file where the class will show as imported
> and in the code in the source file I throw an exception with an instance
> of the class, as in:
>
> throw XX(some_constructor_parameters);
>
> This compiles and links without error.
>
> If instead I use a template to throw an exception, such as:
>
> template<class E> void throw_exception(E const & e) { throw e; }
>
> and then invoke it from my executable as:
>
> throw_exception(XX(some_constructor_parameters));
>
> I receive a linker error of the form:
>
> YY.o: In function `SomeDecoratedName':
> XX.hpp:27: undefined reference to `vtable for XX'
> XX.hpp:27: undefined reference to `vtable for XX'
>
> I realize that this is not a complete example but before reducing my
> code to the least possible example which will reproduce this problem I
> thought I would ask if anyone has encountered anything like it, or has
> any idea why using a template causes a linker error whereas not using
> the template links would link without any problems.
>
>
>
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