Add missing <algorithm> include to correctly use std algorithms in the examples

Author: igaztanaga

example/doc_bufferstream.cpp

@@ -16,6 +16,7 @@
 #include <boost/interprocess/streams/bufferstream.hpp>
 #include <vector>
 #include <iterator>
+#include <algorithm> //std::copy, std::equal
 #include <cstddef>
 //<-
 #include "../test/get_process_id_name.hpp"

example/doc_cont.cpp

@@ -13,6 +13,7 @@
 #include <boost/container/vector.hpp>
 #include <boost/interprocess/allocators/allocator.hpp>
 #include <boost/interprocess/managed_shared_memory.hpp>
+#include <algorithm> //std::sort
 //<-
 #include "../test/get_process_id_name.hpp"
 //->

example/doc_spawn_vector.cpp

@@ -15,6 +15,7 @@
 #include <boost/interprocess/allocators/allocator.hpp>
 #include <string>
 #include <cstdlib> //std::system
+#include <algorithm> //std::sort
 //<-
 #include "../test/get_process_id_name.hpp"
 //->

example/doc_vectorstream.cpp

@@ -18,6 +18,7 @@
 #include <boost/interprocess/managed_shared_memory.hpp>
 #include <boost/interprocess/streams/vectorstream.hpp>
 #include <iterator>
+#include <algorithm> //std::copy, std::equal
 //<-
 #include "../test/get_process_id_name.hpp"
 //->