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littlekid

Explicit Template Specialization - Linker Error

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Hi suppose I have the code as follow


//apple.header
class Apple
{
public:
template <typename ty> void Cut(ty&& var);
};

//apple.cpp
template<typename ty> void Apple::Cut(ty&& var)
{
DoSomethingGreat(std::forward<ty>(var));
}

template void Apple::Cut<MyData&&>(MyData&& var); //specialization 1
template void Apple::Cut<const MyData&>(const MyData& var); //specialization 2

//main.cpp
int main()
{
MyData data;

Apple test_apple;

test_apple.Cut(data); //linker error
}


why does this generate a linker error? It says it can't link to "void Apple::Cut(MyData& var)". If I provide the said specialization it works.

However I don't understand why doesn't it call specialization 2 instead? since MyData& can be bound and converted to const MyData&

regards

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Overload resolution is compile time. Finding a template instantiation is link time. What happens during link time has no effect on what happens at compile time.

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