C++11 init templated member variable - templates

Question

I want to have templated member variable, inited with constructor, like this:
struct S{
//typedef S ThisT;
template<class IdsT, class DataT>
struct CallbackPack{
/*constexpr */CallbackPack(IdsT &selfIds):
selfIds(selfIds){}
const IdsT &selfIds;
};
const CallbackPack<S, S> callbackPack123 = CallbackPack<S, S>((*this));
};
But when I try to compile this I get error.
g++-4.8 -std=c++11 -O2 -Wall -pedantic -pthread main.cpp && ./a.out
main.cpp:16:65: error: expected ';' at end of member declaration
const CallbackPack<S, S> callbackPack123 = CallbackPack<S, S>((*this));
^
main.cpp:16:66: error: expected unqualified-id before '>' token
const CallbackPack<S, S> callbackPack123 = CallbackPack<S, S>((*this));
^
main.cpp:16:65: warning: non-static const member 'const S::CallbackPack<S, S> S::S' in class without a constructor [-Wuninitialized]
const CallbackPack<S, S> callbackPack123 = CallbackPack<S, S>((*this));
^
main.cpp:16:62: error: wrong number of template arguments (1, should be 2)
const CallbackPack<S, S> callbackPack123 = CallbackPack<S, S>((*this));
^
main.cpp:9:12: error: provided for 'template<class IdsT, class DataT> struct S::CallbackPack'
struct CallbackPack{
^
http://coliru.stacked-crooked.com/a/ea9ed4482306ce17

Answer 1

As Mooing Duck said, this is compiler bug https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52595.
To avoid it, you should add parentheses:
const CallbackPack<S, S> callbackPack123 = (CallbackPack<S, S>(*this));

Answer 2

EDIT:
If I'm understanding what you want right, try out this code:
#include <iostream>
#include <tuple>
#include <functional>
struct S{
S() : callbackPack123(*this) {}
template<class IdsT, class DataT>
struct CallbackPack{
// Initializing reference with nullptr is NOT A GOOD THING.
// I'm just doing it to prove that no default constructors are called.
CallbackPack() : selfIds_(nullptr) {
std::cout << "EMPTY CONSTRUCTOR CALLED\n";
}
CallbackPack(IdsT &selfIds) : selfIds_(selfIds) {
std::cout << "IdsT CONSTRUCTOR CALLED\n";
}
const IdsT &selfIds_;
};
const CallbackPack<S, S> callbackPack123;
};
int main()
{
S s;
return 0;
}
It prints
IdsT CONSTRUCTOR CALLED
and nothing else, indicating that the member has been created with the IdsT constructor. I hope this answers your question.