El 09/09/2021 a las 15:21, John Emmas escribió:
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;
}
[portion above moved from end of post]
Please don't top post. Thank you!
https://www.boost.org/community/policy.html
Thanks Joaquin - one quick question... do I need to define 'struct
animal_tag' and 'struct dog_tag' somewhere?
No, this is not needed.
At present, your code compiles and links okay but I still see a
runtime crash at the same line ('dogs.push_back (a2);')
It seems to work for me:
http://coliru.stacked-crooked.com/a/d605f0b3bccfe9fa
Please note that dogs in line 29 is defined as:
Dogs dogs;
whereas in your original code this was:
Animals dogs;
Maybe this is the problem?
Joaquín M López Muñoz
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