Re: dllexport template function: char* parameter problem
* Fabian:
last week I got the suggestion to write template functions for my error
handling. With the implementation I've got a little problem: As the functions
are in a separate dll, I have to instantiate them explicitely in the cpp
file. This works fine for parameters of type int or double. The main purpose
of my error printing function is to print a message though. But for a
explicit instantiation with a char* parameter, the linker strikes:
// header file:
template <typename T1> void TEMPLDLL_API PrintError(const T1& arg1);
// cpp file:
template <typename T1> void PrintError(const T1& arg1)
{
cerr << arg1 << endl;
}
// function call:
PrintError("There was an error.");
This causes a LNK2019:
error LNK2019: unresolved external symbol "__declspec(dllimport) void
__cdecl PrintError<char const [20]>(char const (&)[20])" ...
If I now cast the string to a char* the error is
gone: ErrorHandling::PrintError((char*)"There was an error."); // works
This is really ugly though esp. for an overload with several parameters.
More than ever if I do it the clean c++ way with static_cast<char*>("There
was an error");.
Any suggstions?
Why don't you just provide an ordinary overload for 'char const*'?
Cheers, & hth.,
- Alf
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