diff --git a/include/crap/algorithm.d/maxelementtype.h b/include/crap/algorithm.d/maxelementtype.h
index cb89d5b..67afa4a 100644
--- a/include/crap/algorithm.d/maxelementtype.h
+++ b/include/crap/algorithm.d/maxelementtype.h
@@ -1,11 +1,12 @@
 #ifndef CRAP_ALGORITHM_MAXELEMENTTYPE
 #define CRAP_ALGORITHM_MAXELEMENTTYPE
 
+#include "../utility.d/bisecttype.h"
+#include "../version.d/libintegralconstantcallable.h"
+
 #include <cstddef>
 #include <type_traits>
 
-#include "../utility.d/bisecttype.h"
-
 namespace crap
 {
  template <template <class, class> class, class...> struct maxElementType;
@@ -16,6 +17,9 @@ namespace crap
   constexpr const static std :: size_t npos = 0u;
   using value_type = decltype(value);
   constexpr operator value_type () const noexcept;
+#if (crap_lib_integral_constant_callable >= 201304L)
+  constexpr value_type operator () () const noexcept;
+#endif
  };
 
  template <template <class, class> class Operator, class Type>
@@ -29,6 +33,9 @@ namespace crap
   constexpr const static std :: size_t npos = 1u;
   using value_type = decltype(value);
   constexpr operator value_type () const noexcept;
+#if (crap_lib_integral_constant_callable >= 201304L)
+  constexpr value_type operator () () const noexcept;
+#endif
  };
 
  template <template <class, class> class Operator, class Type1, class Type2>
@@ -42,6 +49,9 @@ namespace crap
   constexpr const static std :: size_t npos = 2u;
   using value_type = decltype(value);
   constexpr operator value_type () const noexcept;
+#if (crap_lib_integral_constant_callable >= 201304L)
+  constexpr value_type operator () () const noexcept;
+#endif
  };
 
  template <template <class, class> class Operator, class ... Types> struct maxElementType
@@ -60,6 +70,9 @@ namespace crap
   constexpr const static std :: size_t npos = sizeof...(Types);
   using value_type = decltype(value);
   constexpr operator value_type () const noexcept;
+#if (crap_lib_integral_constant_callable >= 201304L)
+  constexpr value_type operator () () const noexcept;
+#endif
  };
 }
 
@@ -69,6 +82,15 @@ template <template <class, class> class Operator>
 {
  return crap :: maxElementType <Operator> :: value;
 };
+#if (crap_lib_integral_constant_callable >= 201304L)
+
+template <template <class, class> class Operator>
+	inline constexpr typename crap :: maxElementType <Operator> :: value_type
+	crap :: maxElementType <Operator> :: operator () () const noexcept
+{
+ return crap :: maxElementType <Operator> :: value;
+}
+#endif
 
 template <template <class, class> class Operator, class Type>
 	inline constexpr crap :: maxElementType <Operator, Type> :: operator
@@ -76,6 +98,15 @@ template <template <class, class> class Operator, class Type>
 {
  return crap :: maxElementType <Operator, Type> :: value;
 };
+#if (crap_lib_integral_constant_callable >= 201304L)
+
+template <template <class, class> class Operator, class Type>
+	inline constexpr typename crap :: maxElementType <Operator, Type> :: value_type
+	crap :: maxElementType <Operator, Type> :: operator () () const noexcept
+{
+ return crap :: maxElementType <Operator, Type> :: value;
+}
+#endif
 
 template <template <class, class> class Operator, class Type1, class Type2>
 	inline constexpr crap :: maxElementType <Operator, Type1, Type2> :: operator
@@ -83,6 +114,15 @@ template <template <class, class> class Operator, class Type1, class Type2>
 {
  return crap :: maxElementType <Operator, Type1, Type2> :: value;
 };
+#if (crap_lib_integral_constant_callable >= 201304L)
+
+template <template <class, class> class Operator, class Type1, class Type2>
+	inline constexpr typename crap :: maxElementType <Operator, Type1, Type2> :: value_type
+	crap :: maxElementType <Operator, Type1, Type2> :: operator () () const noexcept
+{
+ return crap :: maxElementType <Operator, Type1, Type2> :: value;
+}
+#endif
 
 template <template <class, class> class Operator, class ... Types>
 	inline constexpr crap :: maxElementType <Operator, Types...> :: operator
@@ -90,5 +130,14 @@ template <template <class, class> class Operator, class ... Types>
 {
  return crap :: maxElementType <Operator, Types...> :: value;
 };
+#if (crap_lib_integral_constant_callable >= 201304L)
+
+template <template <class, class> class Operator, class ... Types>
+	inline constexpr typename crap :: maxElementType <Operator, Types...> :: value_type
+	crap :: maxElementType <Operator, Types...> :: operator () () const noexcept
+{
+ return crap :: maxElementType <Operator, Types...> :: value;
+}
+#endif
 #endif