Re: [Boost-users] Problem understanding 'boost::intrusive::list_member_hook<>'

[Ion Gaztañaga via Boost-users]

But when I try that here, VS2019 throws up this compiler error:-
     error C2039: 'default_list_hook': is not a member of 'animal'

Can anyone explain what I'm doing wrong??

John

It's difficult to see what's wrong without a full compilable example but 
the following snippet works perfectly for me in Visual 2019:


#include <boost/intrusive/list.hpp>
#include <string>
#include <iostream>

using namespace std;

class animal
{
   public:
      animal (string n, int l) : name{move(n)}, legs{l} {}

      string name;
      int legs;
      boost::intrusive::list_member_hook<> _animal_hook;
};

typedef boost::intrusive::member_hook<animal,
   boost::intrusive::list_member_hook<>, &animal::_animal_hook>
      AnimalHookOption;

typedef boost::intrusive::list<animal, AnimalHookOption> Animals;

void print_list (const Animals& elem)
{
   for (const Animals::value_type& a : elem)
      cout << "A " << a.name << " has " << a.legs << " legs" << '\n';
}

int main()
{
   animal a1{"dog", 4};
   animal a2{"spider", 6};
   animal a3{"budgie", 2};
   Animals animals;

   animals.push_back(a1);
   animals.push_back(a2);
   animals.push_back(a3);
   print_list (animals);

   return 0;
}
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