last-mod-time.cpp
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//=======================================================================
// 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)
//=======================================================================
/*
IMPORTANT:
~~~~~~~~~~
This example appears to be broken and crashes at runtime, see
https://github.com/boostorg/graph/issues/148
*/
#ifdef _MSC_VER
#define _CRT_SECURE_NO_WARNINGS
#endif
#include <boost/config.hpp>
#include <iostream>
#include <fstream>
#include <string>
#include <ctime>
#ifdef BOOST_HAS_UNISTD_H
#include <unistd.h>
#endif
#include <sys/stat.h>
#include <boost/graph/adjacency_list.hpp>
using namespace boost;
template < typename Graph, typename VertexNamePropertyMap >
void read_graph_file(std::istream& graph_in, std::istream& name_in, Graph& g,
VertexNamePropertyMap name_map)
{
typedef typename graph_traits< Graph >::vertices_size_type size_type;
size_type n_vertices;
typename graph_traits< Graph >::vertex_descriptor u;
typename property_traits< VertexNamePropertyMap >::value_type name;
graph_in >> n_vertices; // read in number of vertices
for (size_type i = 0; i < n_vertices; ++i)
{ // Add n vertices to the graph
u = add_vertex(g);
name_in >> name;
put(name_map, u, name); // ** Attach name property to vertex u **
}
size_type src, targ;
while (graph_in >> src) // Read in edges
if (graph_in >> targ)
add_edge(src, targ, g); // add an edge to the graph
else
break;
}
int main(int argc, const char** argv)
{
typedef adjacency_list< listS, // Store out-edges of each vertex in a
// std::list
vecS, // Store vertex set in a std::vector
directedS, // The graph is directed
property< vertex_name_t, std::string > // Add a vertex property
>
graph_type;
graph_type g; // use default constructor to create empty graph
std::ifstream file_in(argc >= 2 ? argv[1] : "makefile-dependencies.dat"),
name_in(argc >= 2 ? argv[1] : "makefile-target-names.dat");
if (!file_in)
{
std::cerr << "** Error: could not open file makefile-target-names.dat"
<< std::endl;
exit(-1);
}
// Obtain internal property map from the graph
property_map< graph_type, vertex_name_t >::type name_map
= get(vertex_name, g);
read_graph_file(file_in, name_in, g, name_map);
// Create storage for last modified times
std::vector< time_t > last_mod_vec(num_vertices(g));
// Create nickname for the property map type
typedef iterator_property_map< std::vector< time_t >::iterator,
property_map< graph_type, vertex_index_t >::type, time_t, time_t& >
iter_map_t;
// Create last modified time property map
iter_map_t mod_time_map(last_mod_vec.begin(), get(vertex_index, g));
property_map< graph_type, vertex_name_t >::type name = get(vertex_name, g);
struct stat stat_buf;
graph_traits< graph_type >::vertex_descriptor u;
typedef graph_traits< graph_type >::vertex_iterator vertex_iter_t;
std::pair< vertex_iter_t, vertex_iter_t > p;
for (p = vertices(g); p.first != p.second; ++p.first)
{
u = *p.first;
if (stat(name[u].c_str(), &stat_buf) != 0)
std::cerr << "error in stat() for file " << name[u] << std::endl;
put(mod_time_map, u, stat_buf.st_mtime);
}
for (p = vertices(g); p.first != p.second; ++p.first)
{
std::cout << name[*p.first] << " was last modified at "
<< ctime(&mod_time_map[*p.first]);
}
assert(num_vertices(g) == 15);
assert(num_edges(g) == 19);
return 0;
}