Create a class, foo, with a member function taking a templates parameter:

class Foo {
void Func(std::pair<int32_t, int32_t> size);
};

Right-click on Func and choose Refactor->Add Definition. This will create the implementation in the cpp file but will ignore the template arguments:

void Foo::Func(std::pair size)
{
}

This should be:

void Foo::Func(std::pair<int32_t, int32_t> size)
{
}