diff --git a/sprout/auto_config.hpp b/sprout/auto_config.hpp
index cfb54dda..268962ee 100644
--- a/sprout/auto_config.hpp
+++ b/sprout/auto_config.hpp
@@ -39,6 +39,10 @@
 #	endif	// #ifdef BOOST_NO_TEMPLATE_ALIASES
 #endif	// #ifndef SPROUT_CONFIG_DISABLE_TEMPLATE_ALIASES
 
+//
+// SPROUT_USE_USER_DEFINED_LITERALS
+//
+
 //
 // SPROUT_CONFIG_USE_SSCRISK_CEL
 //
diff --git a/sprout/config.hpp b/sprout/config.hpp
index b22aa4ee..55a57a65 100644
--- a/sprout/config.hpp
+++ b/sprout/config.hpp
@@ -23,6 +23,12 @@
 #	define SPROUT_USE_TEMPLATE_ALIASES 0
 #endif	// #ifndef SPROUT_CONFIG_DISABLE_TEMPLATE_ALIASES
 
+#ifndef SPROUT_CONFIG_DISABLE_USER_DEFINED_LITERALS
+#	define SPROUT_USE_USER_DEFINED_LITERALS 1
+#else	// #ifndef SPROUT_CONFIG_DISABLE_USER_DEFINED_LITERALS
+#	define SPROUT_USE_USER_DEFINED_LITERALS 0
+#endif	// #ifndef SPROUT_CONFIG_DISABLE_USER_DEFINED_LITERALS
+
 #ifndef SPROUT_CONFIG_USE_SSCRISK_CEL
 #	define HDR_FUNCTIONAL_SSCRISK_CEL_OR_SPROUT_DETAIL <sprout/detail/functional.hpp>
 #	define HDR_ALGORITHM_SSCRISK_CEL_OR_SPROUT_DETAIL <sprout/detail/algorithm.hpp>
diff --git a/sprout/uuid.hpp b/sprout/uuid.hpp
index dc212f4b..14267ba3 100644
--- a/sprout/uuid.hpp
+++ b/sprout/uuid.hpp
@@ -6,5 +6,6 @@
 #include <sprout/uuid/uuid_io.hpp>
 #include <sprout/uuid/uuid_hash.hpp>
 #include <sprout/uuid/uuid_generators.hpp>
+#include <sprout/uuid/udl.hpp>
 
 #endif	// #ifndef SPROUT_UUID_HPP
diff --git a/sprout/uuid/string_generator.hpp b/sprout/uuid/string_generator.hpp
index a6d7d4e3..df9d6b36 100644
--- a/sprout/uuid/string_generator.hpp
+++ b/sprout/uuid/string_generator.hpp
@@ -168,6 +168,10 @@ namespace sprout {
 					;
 			}
 		public:
+			template<typename Iterator>
+			SPROUT_CONSTEXPR result_type operator()(Iterator first, Iterator last) const {
+				return generate_1(next_char<Iterator>(first, last));
+			}
 			template<typename Elem, std::size_t N, typename Traits>
 			SPROUT_CONSTEXPR result_type operator()(sprout::basic_string<Elem, N, Traits> const& s) const {
 				return operator()(s.begin(), s.end());
@@ -184,10 +188,6 @@ namespace sprout {
 			SPROUT_CONSTEXPR result_type operator()(char32_t const* s) const {
 				return operator()(s, s + sprout::char_traits<char32_t>::length(s));
 			}
-			template<typename Iterator>
-			SPROUT_CONSTEXPR result_type operator()(Iterator first, Iterator last) const {
-				return generate_1(next_char<Iterator>(first, last));
-			}
 		};
 	}	// namespace uuids
 }	// namespace sprout
diff --git a/sprout/uuid/udl.hpp b/sprout/uuid/udl.hpp
new file mode 100644
index 00000000..0d11c924
--- /dev/null
+++ b/sprout/uuid/udl.hpp
@@ -0,0 +1,40 @@
+#ifndef SPROUT_UUID_UDL_HPP
+#define SPROUT_UUID_UDL_HPP
+
+#include <sprout/config.hpp>
+#include <sprout/uuid/uuid.hpp>
+
+#if SPROUT_USE_USER_DEFINED_LITERALS
+
+#include <cstddef>
+#include <sprout/uuid/string_generator.hpp>
+
+namespace sprout {
+	namespace uuids {
+		namespace udl {
+			//
+			// _uuid
+			//
+			SPROUT_CONSTEXPR sprout::uuids::uuid operator "" _uuid(char const* s, std::size_t) {
+				return sprout::uuids::string_generator()(s);
+			}
+			SPROUT_CONSTEXPR sprout::uuids::uuid operator "" _uuid(wchar_t const* s, std::size_t) {
+				return sprout::uuids::string_generator()(s);
+			}
+			SPROUT_CONSTEXPR sprout::uuids::uuid operator "" _uuid(char16_t const* s, std::size_t) {
+				return sprout::uuids::string_generator()(s);
+			}
+			SPROUT_CONSTEXPR sprout::uuids::uuid operator "" _uuid(char32_t const* s, std::size_t) {
+				return sprout::uuids::string_generator()(s);
+			}
+		}	// namespace uuids
+
+		using sprout::uuids::udl::operator "" _uuid;
+	}	// namespace udl
+
+	using sprout::uuids::udl::operator "" _uuid;
+}	// namespace sprout
+
+#endif	// #if SPROUT_USE_USER_DEFINED_LITERALS
+
+#endif	// #ifndef SPROUT_UUID_UDL_HPP