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Unified Diff: gcc/libstdc++-v3/testsuite/ext/pb_ds/example/priority_queue_dijkstra.cc

Issue 3050029: [gcc] GCC 4.5.0=>4.5.1 (Closed) Base URL: ssh://git@gitrw.chromium.org:9222/nacl-toolchain.git
Patch Set: Created 10 years, 5 months ago
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Index: gcc/libstdc++-v3/testsuite/ext/pb_ds/example/priority_queue_dijkstra.cc
diff --git a/gcc/libstdc++-v3/testsuite/ext/pb_ds/example/priority_queue_dijkstra.cc b/gcc/libstdc++-v3/testsuite/ext/pb_ds/example/priority_queue_dijkstra.cc
deleted file mode 100644
index 74fdc0e62d88f9e9e1bdb071f2447fd059d90fd9..0000000000000000000000000000000000000000
--- a/gcc/libstdc++-v3/testsuite/ext/pb_ds/example/priority_queue_dijkstra.cc
+++ /dev/null
@@ -1,157 +0,0 @@
-// -*- C++ -*-
-
-// Copyright (C) 2005, 2006, 2009 Free Software Foundation, Inc.
-//
-// This file is part of the GNU ISO C++ Library. This library is free
-// software; you can redistribute it and/or modify it under the terms
-// of the GNU General Public License as published by the Free Software
-// Foundation; either version 3, or (at your option) any later
-// version.
-
-// This library is distributed in the hope that it will be useful, but
-// WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-// General Public License for more details.
-
-// You should have received a copy of the GNU General Public License
-// along with this library; see the file COPYING3. If not see
-// <http://www.gnu.org/licenses/>.
-
-
-// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
-
-// Permission to use, copy, modify, sell, and distribute this software
-// is hereby granted without fee, provided that the above copyright
-// notice appears in all copies, and that both that copyright notice
-// and this permission notice appear in supporting documentation. None
-// of the above authors, nor IBM Haifa Research Laboratories, make any
-// representation about the suitability of this software for any
-// purpose. It is provided "as is" without express or implied
-// warranty.
-
-/**
- * @file priority_queue_dijkstra_example.cpp
- * A basic example showing how to cross reference a vector and a
- * priority-queue for modify.
- */
-
-/**
- * This example shows how to cross-reference priority queues
- * and a vector. I.e., using a vector to
- * map keys to entries in a priority queue, and using the priority
- * queue to map entries to the vector. The combination
- * can be used for fast modification of keys.
- *
- * As an example, a very simple form of Diskstra's algorithm is used. The graph
- * is represented by an adjacency matrix. Nodes and vertices are size_ts, and
- * it is assumed that the minimal path between any two nodes is less than 1000.
- */
-
-
-
-#include <vector>
-#include <iostream>
-#include <ext/pb_ds/priority_queue.hpp>
-
-using namespace std;
-using namespace __gnu_pbds;
-
-// The value type of the priority queue.
-// The first entry is the node's id, and the second is the distance.
-typedef std::pair<size_t, size_t> pq_value;
-
-// Comparison functor used to compare priority-queue value types.
-struct pq_value_cmp : public binary_function<pq_value, pq_value, bool>
-{
- inline bool
- operator()(const pq_value& r_lhs, const pq_value& r_rhs) const
- {
- // Note that a value is considered smaller than a different value
- // if its distance is* larger*. This is because by STL
- // conventions, "larger" entries are nearer the top of the
- // priority queue.
- return r_rhs.second < r_lhs.second;
- }
-};
-
-int main()
-{
- enum
- {
- // Number of vertices is hard-coded in this example.
- num_vertices = 5,
- // "Infinity".
- graph_inf = 1000
- };
-
- // The edge-distance matrix.
- // For example, the distance from node 0 to node 1 is 5, and the
- // distance from node 1 to node 0 is 2.
- const size_t a_a_edge_legnth[num_vertices][num_vertices] =
- {
- {0, 5, 3, 7, 6},
- {2, 0, 2, 8, 9},
- {2, 1, 0, 8, 0},
- {1, 8, 3, 0, 2},
- {2, 3, 4, 2, 0}
- };
-
- // The priority queue type.
- typedef __gnu_pbds::priority_queue< pq_value, pq_value_cmp> pq_t;
-
- // The priority queue object.
- pq_t p;
-
- // This vector contains for each node, a find-iterator into the
- // priority queue.
- vector<pq_t::point_iterator> a_it;
-
- // First we initialize the data structures.
-
- // For each node, we push into the priority queue a value
- // identifying it with a distance of infinity.
- for (size_t i = 0; i < num_vertices; ++i)
- a_it.push_back(p.push(pq_value(i, graph_inf)));
-
- // Now we take the initial node, in this case 0, and modify its
- // distance to 0.
- p.modify(a_it[0], pq_value(0, 0));
-
- // The priority queue contains all vertices whose final distance has
- // not been determined, so to finish the algorithm, we must loop
- // until it is empty.
- while (!p.empty())
- {
- // First we find the node whose distance is smallest.
- const pq_value& r_v = p.top();
- const size_t node_id = r_v.first;
- const size_t dist = r_v.second;
-
- // This is the node's final distance, so we can print it out.
- cout << "The distance from 0 to " << node_id
- << " is " << dist << endl;
-
- // Now we go over the node's neighbors and "relax" the
- // distances, if applicable.
- for (size_t neighbor_i = 0; neighbor_i < num_vertices; ++neighbor_i)
- {
- // Potentially, the distance to the neighbor is the distance
- // to the currently-considered node + the distance from this
- // node to the neighbor.
- const size_t pot_dist = dist + a_a_edge_legnth[node_id][neighbor_i];
-
- if (a_it[neighbor_i] == a_it[0])
- continue;
-
- // "Relax" the distance (if appropriate) through modify.
- if (pot_dist < a_it[neighbor_i]->second)
- p.modify(a_it[neighbor_i], pq_value(neighbor_i, pot_dist));
- }
-
- // Done with the node, so we pop it.
- a_it[node_id] = a_it[0];
- p.pop();
- }
-
- return 0;
-}

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