C++ template construction for class member lists - c++

Question

So I have made a little bit of C++ templates before: some quite basic examples of the curiously recurring template pattern for classes of mathematical numbers. This time I tried using the same pattern to create a list or "network" for objects of a class which they could add themselves to and look around for other objects. I thought I could use a static std::list to do this. So my attempt goes like this:
template<class C> class HasNetwork{
public:
HasNetwork(){}
static list<C*> m;
};
template<class C> list<C*> HasNetwork<C>::m = list<C*>();
class IHaveNetwork: public HasNetwork<IHaveNetwork>{
public:
IHaveNetwork(){ m.push_back(this); }
};
int main(){
IHaveNetwork lHF, lHF2;
//for(list<IHaveNetwork*>::iterator it = lHF.m->begin(); ; it++);
return 0;
}
It seems to compile, but I get nasty link errors ( even with the for loop iterator commented out ). Maybe I need to do some cast or maybe "this" is not defined until after the constructor finishes?
Here is the link error:
/tmp/templatest-912860.o: In function `__clang_call_terminate':
templatest.cpp:
(.text.__clang_call_terminate[__clang_call_terminate]+0x9): undefined reference to `__cxa_begin_catch'
templatest.cpp:(.text.__clang_call_terminate[__clang_call_terminate]+0x12): undefined reference to `std::terminate()'
/tmp/templatest-912860.o: In function `__gnu_cxx::new_allocator<std::_List_node<IHaveNetwork*>
>::deallocate(std::_List_node<IHaveNetwork*>*, unsigned long)':
templatest.cpp:
(.text._ZN9__gnu_cxx13new_allocatorISt10_List_nodeIP12IHaveNetworkEE10deallocateEPS4_m[_ZN9__gnu_cxx13new_allocatorISt10_List_nodeIP12IHaveNetworkEE10deallocateEPS4_m]+0x1c): undefined reference to `operator delete(void*)'
/tmp/templatest-912860.o: In function `std::list<IHaveNetwork*, std::allocator<IHaveNetwork*>
>::_M_insert(std::_List_iterator<IHaveNetwork*>, IHaveNetwork* const&)':
templatest.cpp:
(.text._ZNSt4listIP12IHaveNetworkSaIS1_EE9_M_insertESt14_List_iteratorIS1_ERKS1_[_ZNSt4listIP12IHaveNetworkSaIS1_EE9_M_insertESt14_List_iteratorIS1_ERKS1_]+0x31): undefined reference to
`std::__detail::_List_node_base::_M_hook(std::__detail::_List_node_base*)'
/tmp/templatest-912860.o: In function `std::list >::_M_create_node(IHaveNetwork* const&)':
templatest.cpp:
(.text._ZNSt4listIP12IHaveNetworkSaIS1_EE14_M_create_nodeERKS1_[_ZNSt4listIP12IHaveNetworkSaIS1_EE14_M_create_nodeERKS1_]+0xa0): undefined reference to `__cxa_begin_catch'
templatest.cpp:(.text._ZNSt4listIP12IHaveNetworkSaIS1_EE14_M_create_nodeERKS1_[_ZNSt4listIP12IHaveNetworkSaIS1_EE14_M_create_nodeERKS1_]+0xbb): undefined reference to `__cxa_rethrow'
templatest.cpp:
(.text._ZNSt4listIP12IHaveNetworkSaIS1_EE14_M_create_nodeERKS1_[_ZNSt4listIP12IHaveNetworkSaIS1_EE14_M_create_nodeERKS1_]+0xce): undefined reference to `__cxa_end_catch'
/tmp/templatest-912860.o: In function `__gnu_cxx::new_allocator<std::_List_node<IHaveNetwork*> >::allocate(unsigned long, void const*)':
templatest.cpp:(.text._ZN9__gnu_cxx13new_allocatorISt10_List_nodeIP12IHaveNetworkEE8allocateEmPKv[_ZN9__gnu_cxx13new_allocatorISt10_List_nodeIP12IHaveNetworkEE8allocateEmPKv]+0x33): undefined reference to `std::__throw_bad_alloc()'
templatest.cpp:(.text._ZN9__gnu_cxx13new_allocatorISt10_List_nodeIP12IHaveNetworkEE8allocateEmPKv[_ZN9__gnu_cxx13new_allocatorISt10_List_nodeIP12IHaveNetworkEE8allocateEmPKv]+0x40): undefined reference to `operator new(unsigned long)'
/tmp/templatest-912860.o:(.eh_frame+0x13): undefined reference to `__gxx_personality_v0'

Answer 1

I cannot reproduce.
Here is a slightly modified version of you code that compiles links and runs without even a warning (I only had to fix some indirection level errors):
#include <iostream>
#include <list>
#include <string>
template<class C> class HasNetwork{
public:
HasNetwork(){}
static std::list<C*> m;
};
template<class C> std::list<C*> HasNetwork<C>::m = std::list<C*>();
class IHaveNetwork: public HasNetwork<IHaveNetwork>{
std::string name;
public:
IHaveNetwork(const std::string &name): name(name) { m.push_back(this); }
std::string getName() const {
return name;
}
};
int main(){
IHaveNetwork lHF("foo"), lHF2("bar");
for(std::list<IHaveNetwork*>::iterator it = lHF.m.begin(); it != lHF.m.end(); it++) {
std::cout << (*it)->getName() << std::endl;
}
return 0;
}