id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
2862	slist::swap is broken when cache_last< true > is used	Andrey Semashev	Ion Gaztañaga	"Swapping two slists with the cache_last option yields an invalid slist. The following code snippet demonstrates the problem:

{{{
#include <iostream>
#include <boost/checked_delete.hpp>
#include <boost/intrusive/options.hpp>
#include <boost/intrusive/slist.hpp>
#include <boost/intrusive/slist_hook.hpp>

namespace bi = boost::intrusive;

typedef bi::slist_base_hook<
    bi::link_mode< bi::safe_link >
> BaseHook_t;

struct MyData :
    public BaseHook_t
{
    int m_Data;

    explicit MyData(int d) : m_Data(d) {}
};


int main(int, char*[])
{
    typedef bi::slist<
        MyData,
        bi::base_hook< BaseHook_t >,
        bi::constant_time_size< true >,
        bi::cache_last< true >
    > List_t;

    List_t l1;

    MyData* p = 0;
    p = new MyData(1); l1.push_back(*p);
    p = new MyData(2); l1.push_back(*p);
    p = new MyData(3); l1.push_back(*p);
    p = new MyData(4); l1.push_back(*p);

    std::cout << ""l1.front() = "" << &l1.front() << std::endl;

    List_t l2;

    l2.swap(l1);

    std::cout << ""l2.front() = "" << &l2.front() << std::endl; // should be the same as l1.front() above

    l2.clear_and_dispose(boost::checked_deleter< MyData >()); // this line crashes

    return 0;
}
}}}
"	Bugs	closed	Boost 1.39.0	intrusive	Boost 1.38.0	Showstopper	fixed	slist swap