Use <boost/container/detail/minimal_char_traits_header.hpp> to avoid including <string> when possible.

include/boost/interprocess/detail/segment_manager_helper.hpp

@@ -28,8 +28,8 @@
 #include <boost/type_traits/make_unsigned.hpp>
 #include <boost/type_traits/alignment_of.hpp>
 #include <boost/intrusive/pointer_traits.hpp>
+#include <boost/container/detail/minimal_char_traits_header.hpp>
 #include <cstddef>   //std::size_t
-#include <string>    //char_traits
 #include <new>       //std::nothrow
 #include <iterator>  //std::iterator_traits
 #include <boost/assert.hpp>   //BOOST_ASSERT

include/boost/interprocess/indexes/iset_index.hpp

@@ -22,6 +22,7 @@
 #include <boost/interprocess/detail/utilities.hpp>
 #include <boost/intrusive/detail/minimal_pair_header.hpp>         //std::pair
 #include <boost/intrusive/detail/minimal_less_equal_header.hpp>   //std::less
+#include <boost/container/detail/minimal_char_traits_header.hpp>  //std::char_traits
 #include <boost/intrusive/set.hpp>
 
 //!\file

include/boost/interprocess/indexes/iunordered_set_index.hpp

@@ -24,6 +24,7 @@
 #include <boost/intrusive/unordered_set.hpp>
 #include <boost/intrusive/detail/minimal_pair_header.hpp>
 #include <boost/intrusive/detail/minimal_less_equal_header.hpp>   //std::less
+#include <boost/container/detail/minimal_char_traits_header.hpp>  //std::char_traits
 
 //!\file
 //!Describes index adaptor of boost::intrusive::unordered_set container, to use it

include/boost/interprocess/segment_manager.hpp

@@ -34,8 +34,8 @@
 #include <boost/interprocess/smart_ptr/deleter.hpp>
 #include <boost/move/utility_core.hpp>
 #include <boost/interprocess/sync/scoped_lock.hpp>
+#include <boost/container/detail/minimal_char_traits_header.hpp>
 #include <cstddef>   //std::size_t
-#include <string>    //char_traits
 #include <new>       //std::nothrow
 #include <boost/intrusive/detail/minimal_pair_header.hpp>
 #include <boost/assert.hpp>