Flatten a list: Difference between revisions
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C.f. [[Tree traversal]]
=={{header|C++}}==
<lang cpp>
#include <list>
#include <boost/any.hpp>
typedef std::list<boost::any> anylist;
void flatten(std::list<boost::any>& list)
{
typedef anylist::iterator iterator;
iterator current = list.begin();
while (current != list.end())
{
if (current->type() == typeid(anylist))
{
iterator next = current;
++next;
list.splice(next, boost::any_cast<anylist&>(*current));
next = current;
++next;
list.erase(current);
current = next;
}
else
++current;
}
}
</lang>
=={{header|Common Lisp}}==
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