Add comment describing the use of noncopyable_::base_token

2018-08-25 15:36:29 +03:00
parent 91c5184fca
commit 0d7d9c72ef
1 changed files with 4 additions and 0 deletions
--- a/include/boost/type_traits/is_noncopyable.hpp
+++ b/include/boost/type_traits/is_noncopyable.hpp
@ -19,6 +19,10 @@ namespace boost
 #ifndef BOOST_NONCOPYABLE_BASE_TOKEN_DEFINED
 #define BOOST_NONCOPYABLE_BASE_TOKEN_DEFINED

+// boost::noncopyable derives from noncopyable_::base_token to enable us
+// to recognize it. The definition is macro-guarded so that we can replicate
+// it here without including boost/core/noncopyable.hpp, which is in Core.
+
 namespace noncopyable_
 {
    struct base_token {};