boost_1_45_0/libs/disjoint_sets/disjoint_set_test.cpp

//  (C) Copyright Jeremy Siek 2002.
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)

#include <boost/pending/disjoint_sets.hpp>
#include <boost/test/minimal.hpp>
#include <boost/cstdlib.hpp>

template <typename DisjointSet>
struct test_disjoint_set {
  static void do_test()
  {
    // The following tests are pretty lame, just a basic sanity check.
    // Industrial strength tests still need to be written.
    
#if !defined(__MWERKS__) || __MWERKS__ > 0x3003
    std::size_t elts[]
#else
    std::size_t elts[4]
#endif 
        = { 0, 1, 2, 3 };
    
    const int N = sizeof(elts)/sizeof(*elts);
    
    DisjointSet ds(N);

    ds.make_set(elts[0]);
    ds.make_set(elts[1]);
    ds.make_set(elts[2]);
    ds.make_set(elts[3]);

    BOOST_CHECK(ds.find_set(0) != ds.find_set(1));
    BOOST_CHECK(ds.find_set(0) != ds.find_set(2));
    BOOST_CHECK(ds.find_set(0) != ds.find_set(3));
    BOOST_CHECK(ds.find_set(1) != ds.find_set(2));
    BOOST_CHECK(ds.find_set(1) != ds.find_set(3));
    BOOST_CHECK(ds.find_set(2) != ds.find_set(3));


    ds.union_set(0, 1);
    ds.union_set(2, 3);
    BOOST_CHECK(ds.find_set(0) != ds.find_set(3));
    int a = ds.find_set(0);
    BOOST_CHECK(a == ds.find_set(1));
    int b = ds.find_set(2);
    BOOST_CHECK(b == ds.find_set(3));

    ds.link(a, b);
    BOOST_CHECK(ds.find_set(a) == ds.find_set(b));
    BOOST_CHECK(1 == ds.count_sets(elts, elts + N));

    ds.normalize_sets(elts, elts + N);
    ds.compress_sets(elts, elts + N);
    BOOST_CHECK(1 == ds.count_sets(elts, elts + N));
  }
};

int
test_main(int, char*[])
{
  using namespace boost;
  {
    typedef 
      disjoint_sets_with_storage<identity_property_map, identity_property_map,
      find_with_path_halving> ds_type;
    test_disjoint_set<ds_type>::do_test();
  }
  {
    typedef 
      disjoint_sets_with_storage<identity_property_map, identity_property_map,
      find_with_full_path_compression> ds_type;
    test_disjoint_set<ds_type>::do_test();
  }
  return boost::exit_success;
}