diff --git a/include/boost/utility/string_ref.hpp b/include/boost/utility/string_ref.hpp
index ffadb2e..6e9f7bb 100644
--- a/include/boost/utility/string_ref.hpp
+++ b/include/boost/utility/string_ref.hpp
@@ -161,6 +161,10 @@ namespace boost {
 
 
         // basic_string_ref string operations
+        basic_string_ref substr() const {
+            return basic_string_ref(data(), size());
+            }
+
         basic_string_ref substr(size_type pos, size_type n=npos) const {
             if ( pos > size())
                 BOOST_THROW_EXCEPTION( std::out_of_range ( "string_ref::substr" ) );
diff --git a/include/boost/utility/string_view.hpp b/include/boost/utility/string_view.hpp
index c3be4e3..6c682b2 100644
--- a/include/boost/utility/string_view.hpp
+++ b/include/boost/utility/string_view.hpp
@@ -189,6 +189,10 @@ namespace boost {
             return rlen;
             }
 
+        BOOST_CXX14_CONSTEXPR basic_string_view substr() const {
+            return basic_string_view(data(), size());
+            }
+
         BOOST_CXX14_CONSTEXPR basic_string_view substr(size_type pos, size_type n=npos) const {
             if ( pos > size())
                 BOOST_THROW_EXCEPTION( std::out_of_range ( "string_view::substr" ) );