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

[John Emmas via Boost-users]

Thanks Joaquin - one quick question... do I need to define 'struct 
animal_tag' and 'struct dog_tag' somewhere?

At present, your code compiles and links okay but I still see a runtime 
crash at the same line ('dogs.push_back (a2);')

This time though, it gives me a runtime error message saying:- Assertion 
failed: !safemode_or_autounlink || node_algorithms::inited(to_insert), 
file F:\+GTK-SOURCES\gnu-windows\include\boost\intrusive\list.hpp, line 271

Thanks, John


On 09/09/2021 12:16, Joaquin M López Muñoz via Boost-users wrote:

if you mean for the elements to be allowed in both lists at the same 
time, use tags:

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

    typedef 
boost::intrusive::list_base_hook<boost::intrusive::tag<struct 
animal_tag>> animals_hook;
    typedef 
boost::intrusive::list_base_hook<boost::intrusive::tag<struct 
dog_tag>> dogs_hook;

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

        std::string name;
        int legs;
    };

    typedef 
boost::intrusive::list<animal,boost::intrusive::base_hook<animals_hook>> 
Animals;
    typedef 
boost::intrusive::list<animal,boost::intrusive::base_hook<dogs_hook>> 
Dogs;

    int main()
    {
        animal a1{"labrador", 4};
        animal a2{"bulldog", 4};

        Animals animals;
        animals.push_back (a2);  // <--- 'bulldog' works okay

        Dogs dogs;
        dogs.push_back (a1);     // <--- 'labrador' works okay
        dogs.push_back (a2);     // <--- 'bulldog' works okay

        return 0;
    }

Joaquín M López Muñoz


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