Imported from /home/lorry/working-area/delta_boost-tarball/boost_1_58_0.tar.bz2.HEADboost_1_58_0master

1 files changed, 144 insertions, 0 deletions

diff --git a/libs/phoenix/example/bind_goose.cpp b/libs/phoenix/example/bind_goose.cpp
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+/*=============================================================================
+For Boost Bind:
+    Copyright (c) 2001-2004 Peter Dimov and Multi Media Ltd.
+    Copyright (c) 2001 David Abrahams
+    Copyright (c) 2005 Peter Dimov
+For Boost Phoenix:
+    Copyright (c) 2001-2010 Joel de Guzman
+    Copyright (c) 2010 Thomas Heller
+For the example:
+    Copyright (c) 2011 Paul Heil
+    Copyright (c) 2015 John Fletcher
+
+    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)
+==============================================================================*/
+// bind_goose.cpp
+// This example is based on code by Paul Heil to be found here:
+// http://www.codeproject.com/Tips/248492/How-does-boost-phoenix-improve-boost-bind
+//
+// Show different ways of using boost bind and phoenix to handle deletion.
+//
+
+
+#include <iostream>
+#include <boost/function.hpp>
+#include <boost/bind.hpp>
+#include <boost/phoenix/core.hpp>
+#include <boost/phoenix/bind.hpp>
+#include <boost/phoenix/operator/comparison.hpp>
+#include <boost/phoenix/stl/algorithm/transformation.hpp>
+#include <functional>
+#include <string>
+#include <vector>
+
+////////////////////////////////////////////
+// Set up the list here
+////////////////////////////////////////////
+std::vector< std::string > make_list() {
+  std::vector< std::string > list;
+  list.push_back( "duck" );
+  list.push_back( "duck" );
+  list.push_back( "goose" );
+  return list;
+}
+//////////////////////////////////////////////
+// First example using standard library only
+//////////////////////////////////////////////
+bool IsGoose( const std::string& s )
+{
+  return s == "goose";
+}
+
+void delete_value1(std::vector< std::string > &list )
+{
+  list.erase( std::remove_if( list.begin(), list.end(), IsGoose ), list.end() );
+}
+
+void out_string(const std::string  &s)
+{
+  std::cout << s << std::endl;
+}
+
+void show_list1( const std::vector< std::string > &list )
+{
+  std::for_each(list.begin(), list.end(), out_string);
+}
+
+//////////////////////////////////////////////
+// Second example using boost bind
+//////////////////////////////////////////////
+
+bool isValue(const std::string &s1, const std::string &s2)
+{
+  return s1==s2;
+}
+
+void delete_value2(std::vector< std::string > &list, const std::string & value)
+{
+  list.erase(
+    std::remove_if(
+        list.begin(),
+        list.end(),
+        boost::bind(
+            isValue, // &isValue works as well.
+            _1, // Boost.Bind placeholder
+            boost::cref( value ) ) ),
+    list.end() );
+}
+
+///////////////////////////////////////////////////////
+// Third example using boost phoenix for the comparison
+///////////////////////////////////////////////////////
+
+namespace phx = boost::phoenix;
+using phx::placeholders::arg1;
+using phx::placeholders::arg2;
+
+void delete_value3(std::vector< std::string > &list, const std::string & value)
+{
+  list.erase( std::remove_if(
+        list.begin(),
+        list.end(),
+        // This needs header boost/phoenix/operator/comparison.
+        // arg1 is a Boost.Phoenix placeholder.
+        arg1 == phx::cref( value ) ),
+        list.end() );
+}
+
+//////////////////////////////////////////////////////////////
+// Third example using boost phoenix for the algorithm as well
+//////////////////////////////////////////////////////////////
+
+void delete_value4(std::vector< std::string > &list, const std::string & value)
+{
+  // This need header boost/phoenix/stl/algorithm/transformation
+  list.erase( phx::remove_if( arg1, arg2 )
+            ( list, arg1 == phx::cref( value ) ),
+            list.end() );
+}
+
+int main() {
+  std::cout << "--------------------------------" << std::endl;
+  std::cout << "Delete the goose examples." << std::endl;
+  std::cout << "--------------------------------" << std::endl;
+  std::string value = "goose";
+
+  std::vector< std::string > list1 = make_list();
+  delete_value1(list1);
+  show_list1(list1);
+  std::cout << "--------------------------------" << std::endl;
+  std::vector< std::string > list2 = make_list();
+  delete_value2(list2,value);
+  show_list1(list2);
+  std::cout << "--------------------------------" << std::endl;
+  std::vector< std::string > list3 = make_list();
+  delete_value3(list3,value);
+  show_list1(list3);
+  std::cout << "--------------------------------" << std::endl;
+  std::vector< std::string > list4 = make_list();
+  delete_value4(list4,value);
+  show_list1(list4);
+  std::cout << "--------------------------------" << std::endl;
+  return 0;
+}