dllexport does not export explicit function template instantiation definition

Question

I can instantiate and MFC-export a function, but am unable to instantiate a templated function. I need the template to be defined generically so I can instantiate it elsewhere in the translation unit.

The sample code shows using MFC __declspec(dllexport) to export these functions:

// ExportTmpldFunc.h
void __declspec( dllexport ) MyFunc(); // MFC exported function declaration

template< class T >
void __declspec( dllexport ) MyTmpldFunc(); // primary MFC exported function template declaration

// ExportTmpldFunc.cpp
#include "ExportTmpldFunc.h"

void MyFunc() // function definition implicitly instantiated
{}

template< class T >
void MyTmpldFunc() // function template defined, but not instantiated
{}

// attempt1 to instantiate
template<> void MyTmpldFunc< int >() // explicit function template specialization defined, but not instantiated for MSVC
{}

// attempt2 to instantiate
template void MyTmpldFunc< int >(); // explicit function template instantiation definition, but still not instantiated for MSVC

Exporting MyFunc works:

But my attempts to export MyTmpldFunc do not:

TL;DR of the dupe: You need to add the `__declspec( dllexport )` to the instantiation as well — NathanOliver, Dec 13 '22 at 16:48

dllexport does not export explicit function template instantiation definition

0 Answers0