Merge pull request #405 from murraycu/develop-murrayc-examples-modern-cpp-attempt2

Examples: Fix minor warnings

example/fibonacci_heap.cpp

@@ -34,7 +34,7 @@ int main()
         uniform_int<> distrib(0, N - 1);
         boost::variate_generator< random_ns::mt19937&, uniform_int<> > rand_gen(
             gen, distrib);
-        for (int t = 0; t < 10; ++t)
+        for (std::size_t t = 0; t < 10; ++t)
         {
             std::vector< float > v, w(N);
 

example/graph-thingie.cpp

@@ -14,6 +14,7 @@
 #include <boost/foreach.hpp>
 #include <string>
 #include <sstream>
+#include <cstdlib>
 
 using namespace boost;
 using namespace std;
@@ -104,5 +105,5 @@ int main()
              << get("label", dp, v) << ")\n";
     }
 
-    return 0;
+    return status ? EXIT_SUCCESS : EXIT_FAILURE;
 }

example/prim-telephone.cpp

@@ -53,12 +53,12 @@ int main()
 #endif
 
     int total_weight = 0;
-    for (int v = 0; v < num_vertices(g); ++v)
+    for (std::size_t v = 0; v < num_vertices(g); ++v)
         if (parent[v] != v)
             total_weight += get(weight, edge(parent[v], v, g).first);
     std::cout << "total weight: " << total_weight << std::endl;
 
-    for (int u = 0; u < num_vertices(g); ++u)
+    for (std::size_t u = 0; u < num_vertices(g); ++u)
         if (parent[u] != u)
             edge_attr_map[edge(parent[u], u, g_dot).first]["color"] = "black";
     std::ofstream out("figs/telephone-mst-prim.dot");