...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::heap::heap_merge
// In header: <boost/heap/heap_merge.hpp> template<typename Heap1, typename Heap2> void heap_merge(Heap1 & lhs, Heap2 & rhs);