diff --git a/include/boost/mpl/string.hpp b/include/boost/mpl/string.hpp
index 6a9481a..c62d8ab 100644
--- a/include/boost/mpl/string.hpp
+++ b/include/boost/mpl/string.hpp
@@ -240,6 +240,18 @@ namespace boost { namespace mpl
         };
     };
 
+    template<typename Tag>
+    struct has_push_back_impl;
+
+    template<>
+    struct has_push_back_impl<mpl::string_tag>
+    {
+        template<typename Sequence>
+        struct apply
+          : mpl::true_
+        {};
+    };
+
     template<typename Tag>
     struct pop_back_impl;
 
@@ -267,6 +279,18 @@ namespace boost { namespace mpl
         #undef M0
     };
 
+    template<typename Tag>
+    struct has_pop_back_impl;
+
+    template<>
+    struct has_pop_back_impl<mpl::string_tag>
+    {
+        template<typename Sequence>
+        struct apply
+          : mpl::true_
+        {};
+    };
+
     template<typename Tag>
     struct push_front_impl;
 
@@ -341,6 +365,18 @@ namespace boost { namespace mpl
         };
     };
 
+    template<typename Tag>
+    struct has_push_front_impl;
+
+    template<>
+    struct has_push_front_impl<mpl::string_tag>
+    {
+        template<typename Sequence>
+        struct apply
+          : mpl::true_
+        {};
+    };
+
     template<typename Tag>
     struct pop_front_impl;
 
@@ -375,6 +411,18 @@ namespace boost { namespace mpl
         };
     };
 
+    template<typename Tag>
+    struct has_pop_front_impl;
+
+    template<>
+    struct has_pop_front_impl<mpl::string_tag>
+    {
+        template<typename Sequence>
+        struct apply
+          : mpl::true_
+        {};
+    };
+
     template<typename Tag>
     struct insert_range_impl;