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[SVN r34286]

doc/code/doc_bufferstream.cpp

@@ -0,0 +1,70 @@
+   #include <boost/interprocess/detail/config_begin.hpp>
+   #include <boost/interprocess/detail/workaround.hpp>
+
+   #include <boost/interprocess/managed_shared_memory.hpp>
+   #include <boost/interprocess/streams/bufferstream.hpp>
+   #include <vector>
+   #include <iterator>
+   
+   using namespace boost::interprocess;
+
+   int main ()
+   {
+      managed_shared_memory::remove("MySharedMemory");
+      //Create shared memory
+      managed_shared_memory segment(create_only, 
+                                  "MySharedMemory",  //segment name
+                                  65536);
+
+      //Fill data
+      std::vector<int> data, data2;
+      data.reserve(100);
+      for(int i = 0; i < 100; ++i){
+         data.push_back(i);
+      }
+
+      //Allocate a buffer in shared memory to write data
+      char *my_cstring = 
+         segment.construct<char>("MyCString")[100*5](0);
+      bufferstream mybufstream(my_cstring, 100*5);
+
+      //Now write data to the buffer
+      for(int i = 0; i < 100; ++i){
+         mybufstream << data[i] << std::endl;
+      }
+
+      //Check there was no overflow attempt
+      assert(mybufstream.good());
+
+      //Extract all values from the shared memory string
+      //directly to a vector.
+      data2.reserve(100);
+      std::istream_iterator<int> it(mybufstream), itend;
+      std::copy(it, itend, std::back_inserter(data2));
+
+      //This extraction should have ended will fail error since 
+      //the numbers formatted in the buffer end before the end
+      //of the buffer. (Otherwise it would trigger eofbit)
+      assert(mybufstream.fail());
+
+      //Compare data
+      assert(std::equal(data.begin(), data.end(), data2.begin()));
+
+      //Clear errors and rewind
+      mybufstream.clear();
+      mybufstream.seekp(0, std::ios::beg);
+      
+      //Now write again the data trying to do a buffer overflow
+      for(int i = 0; i < 500; ++i){
+         mybufstream << data[i] << std::endl;
+      }
+
+      //Now make sure badbit is active
+      //which means overflow attempt.
+      assert(!mybufstream.good());
+      assert(mybufstream.bad());
+      segment.destroy_ptr(my_cstring);      
+      return 0;
+   }
+
+   #include <boost/interprocess/detail/config_end.hpp>