asio examples added

examples/asio/echo_client.cpp

@@ -15,49 +15,41 @@
 #include <cstdlib>
 #include <cstring>
 #include <iostream>
+
 #include <boost/asio.hpp>
 
 using boost::asio::ip::tcp;
 
-enum { max_length = 1024 };
+enum {
+    max_length = 1024
+};
 
-int main(int argc, char* argv[])
-{
-  try
-  {
-    if (argc != 3)
-    {
-      std::cerr << "Usage: echo_client <host> <port>\n";
-      return 1;
+int main( int argc, char* argv[]) {
+    try {
+        if ( 3 != argc) {
+            std::cerr << "Usage: echo_client <host> <port>\n";
+            return EXIT_FAILURE;
+        }
+        boost::asio::io_service io_service;
+        tcp::resolver resolver( io_service);
+        tcp::resolver::query query( tcp::v4(), argv[1], argv[2]);
+        tcp::resolver::iterator iterator = resolver.resolve( query);
+        tcp::socket s( io_service);
+        boost::asio::connect( s, iterator);
+        std::cout << "Enter message: ";
+        char request[max_length];
+        std::cin.getline( request, max_length);
+        size_t request_length = std::strlen( request);
+        boost::asio::write( s, boost::asio::buffer( request, request_length) );
+        char reply[max_length];
+        size_t reply_length = boost::asio::read( s, boost::asio::buffer( reply, request_length) );
+        std::cout << "Reply is: ";
+        std::cout.write( reply, reply_length);
+        std::cout << "\n";
+        return EXIT_SUCCESS;
+    } catch ( std::exception const& e) {
+        std::cerr << "Exception: " << e.what() << "\n";
     }
 
-    boost::asio::io_service io_service;
-
-    tcp::resolver resolver(io_service);
-    tcp::resolver::query query(tcp::v4(), argv[1], argv[2]);
-    tcp::resolver::iterator iterator = resolver.resolve(query);
-
-    tcp::socket s(io_service);
-    boost::asio::connect(s, iterator);
-
-    using namespace std; // For strlen.
-    std::cout << "Enter message: ";
-    char request[max_length];
-    std::cin.getline(request, max_length);
-    size_t request_length = strlen(request);
-    boost::asio::write(s, boost::asio::buffer(request, request_length));
-
-    char reply[max_length];
-    size_t reply_length = boost::asio::read(s,
-        boost::asio::buffer(reply, request_length));
-    std::cout << "Reply is: ";
-    std::cout.write(reply, reply_length);
-    std::cout << "\n";
-  }
-  catch (std::exception& e)
-  {
-    std::cerr << "Exception: " << e.what() << "\n";
-  }
-
-  return 0;
+    return EXIT_FAILURE;
 }