| //======================================================================= |
| // Copyright 2001 Jeremy G. Siek, Andrew Lumsdaine, Lie-Quan Lee, |
| // |
| // 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/config.hpp> |
| #include <fstream> |
| #include <iostream> |
| #include <string> |
| #include <boost/graph/adjacency_list.hpp> |
| #include <boost/graph/graph_utility.hpp> |
| |
| using namespace boost; |
| |
| namespace std |
| { |
| template < typename T > |
| std::istream & operator >> (std::istream & in, std::pair < T, T > &p) |
| { |
| in >> p.first >> p.second; |
| return in; |
| } |
| } |
| |
| typedef adjacency_list < listS, // Store out-edges of each vertex in a std::list |
| vecS, // Store vertex set in a std::vector |
| directedS // The file dependency graph is directed |
| > file_dep_graph; |
| |
| typedef graph_traits < file_dep_graph >::vertex_descriptor vertex_t; |
| typedef graph_traits < file_dep_graph >::edge_descriptor edge_t; |
| |
| bool |
| has_cycle_dfs(const file_dep_graph & g, vertex_t u, |
| default_color_type * color) |
| { |
| color[u] = gray_color; |
| graph_traits < file_dep_graph >::adjacency_iterator vi, vi_end; |
| for (boost::tie(vi, vi_end) = adjacent_vertices(u, g); vi != vi_end; ++vi) |
| if (color[*vi] == white_color) { |
| if (has_cycle_dfs(g, *vi, color)) |
| return true; // cycle detected, return immediately |
| } else if (color[*vi] == gray_color) // *vi is an ancestor! |
| return true; |
| color[u] = black_color; |
| return false; |
| } |
| |
| bool |
| has_cycle(const file_dep_graph & g) |
| { |
| std::vector < default_color_type > color(num_vertices(g), white_color); |
| graph_traits < file_dep_graph >::vertex_iterator vi, vi_end; |
| for (boost::tie(vi, vi_end) = vertices(g); vi != vi_end; ++vi) |
| if (color[*vi] == white_color) |
| if (has_cycle_dfs(g, *vi, &color[0])) |
| return true; |
| return false; |
| } |
| |
| |
| int |
| main() |
| { |
| std::ifstream file_in("makefile-dependencies.dat"); |
| typedef graph_traits < file_dep_graph >::vertices_size_type size_type; |
| size_type n_vertices; |
| file_in >> n_vertices; // read in number of vertices |
| std::istream_iterator < std::pair < size_type, |
| size_type > > input_begin(file_in), input_end; |
| #if defined(BOOST_MSVC) && BOOST_MSVC <= 1300 |
| // VC++ has trouble with the edge iterator constructor |
| file_dep_graph g(n_vertices); |
| while (input_begin != input_end) { |
| size_type i, j; |
| boost::tie(i, j) = *input_begin++; |
| add_edge(i, j, g); |
| } |
| #else |
| file_dep_graph g(input_begin, input_end, n_vertices); |
| #endif |
| |
| std::vector < std::string > name(num_vertices(g)); |
| std::ifstream name_in("makefile-target-names.dat"); |
| graph_traits < file_dep_graph >::vertex_iterator vi, vi_end; |
| for (boost::tie(vi, vi_end) = vertices(g); vi != vi_end; ++vi) |
| name_in >> name[*vi]; |
| |
| assert(has_cycle(g) == false); |
| return 0; |
| } |