You could use a typedef:
typedef SBase<int, double, short, unsigned int, float, unsigned char,
long, unsigned long> B_SBase;
struct B : public A, public B_SBase {
using B_SBase::func;
};
Frage
Some of my base classes get tons of parameters. Now I want to specify which static function to use:
template <typename... Types>
struct SBase {
static void func() {
}
};
struct A : public SBase<int> {
};
struct B : public A, public SBase<int, double, short,
unsigned int, float, unsigned char, long, unsigned long> {
// using SBase::func; // Not possible.
// Horrible, but works.
using SBase<int, double, short,
unsigned int, float, unsigned char, long, unsigned long>::func;
};
Aso you can see, I need to write the template parameters twice which leads to code duplication.
Is there any way to get rid of it?
Lösung
You could use a typedef:
typedef SBase<int, double, short, unsigned int, float, unsigned char,
long, unsigned long> B_SBase;
struct B : public A, public B_SBase {
using B_SBase::func;
};
Andere Tipps
If B is already a template (which is mostly the case in my code), then you could use sth like this:
template <typename MyBase = SBase<int, double, short,
unsigned int, float, unsigned char,
long, unsigned long> >
struct B : public A, public MyBase {
using MyBase::func;
};
If it's not, however, there is no possibility I'm aware of not to repeat the base class or polluting the namespace with a typedef SBase<...> Bs_Base
. But if you're clever, you just have to write it twice:
struct B : public A, public SBase<int, double, short,
unsigned int, float, unsigned char, long, unsigned long> {
typedef SBase<int, double, short, unsigned int, float,
unsigned char, long, unsigned long> MyBase;
};
static_assert(std::is_base_of<B::MyBase, B>::value, "");
Make B
a class template. There, no repetetetitions:
template<typename... Types>
struct B : public A, public SBase<Types...> {
using SBase<Types...>::func;
};
typedef B<int, double, short, unsigned int, float, unsigned char, long, unsigned long> BB;
void foo ()
{
BB::func();
}