23.list.special.stdcxx-334.cpp

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#include <list>
#include <string>
#include <cassert>
 
class Alloc : public std::allocator <char>
{
};
 
bool operator== (Alloc, Alloc)
{
    return false;
}
 
bool operator!= (Alloc, Alloc)
{
    return true;
}
 
 
int main ()
{
    const char src [] = "source string";
    const char dst [] = "destination string";
 
    typedef std::list <char, Alloc> List;
    
    Alloc a1;
    Alloc a2;
 
    assert (!(a1 == a2));
 
    List src_lst (src, src + sizeof (src) - 1, a1);
    List dst_lst (dst, dst + sizeof (dst) - 1, a2);
 
    src_lst.swap (dst_lst);
 
    assert (std::string (src_lst.begin (), src_lst.end ()) == dst);
    assert (std::string (dst_lst.begin (), dst_lst.end ()) == src);
 
    return 0;
}