Boost.RangeEx merged into Boost.Range

[SVN r60897]

doc/reference/adaptors/examples/map_keys.cpp

@@ -0,0 +1,24 @@
+#include <boost/range/adaptor/map.hpp>
+#include <boost/range/algorithm/copy.hpp>
+#include <boost/assign.hpp>
+#include <algorithm>
+#include <iostream>
+#include <map>
+#include <vector>
+
+int main(int argc, const char* argv[])
+{
+    using namespace boost::assign;
+    using namespace boost::adaptors;
+    
+    std::map<int, int> input;
+    for (int i = 0; i < 10; ++i)
+        input.insert(std::make_pair(i, i * 10));
+        
+    boost::copy(
+        input | map_keys,
+        std::ostream_iterator<int>(std::cout, ","));
+        
+    return 0;
+}
+