Implement is_scoped_enum and is_unscoped_enum

doc/is_scoped_enum.qbk

@@ -0,0 +1,45 @@
+[/
+Copyright 2020 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License,
+Version 1.0. (See accompanying file LICENSE_1_0.txt
+or copy at http://www.boost.org/LICENSE_1_0.txt).
+]
+
+[section:is_scoped_enum is_scoped_enum]
+
+    template<class T>
+    struct is_scoped_enum
+        : __tof { };
+
+__inherit If T is a (possibly cv-qualified) scoped enumeration type
+(`enum class` but not `enum`), then inherits from __true_type, otherwise
+inherits from __false_type.
+
+__header `#include <boost/type_traits/is_scoped_enum.hpp>`
+
+[all_compilers]
+
+__examples
+
+[:Given: `enum class color { red, blue };` and `enum fruit { apple, orange };`]
+
+[:`is_scoped_enum<color>` inherits from `__true_type`.]
+
+[:`is_scoped_enum<fruit>` inherits from `__false_type`.]
+
+[:`is_scoped_enum<color const>::type` is the type `__true_type`.]
+
+[:`is_scoped_enum<color>::value` is an integral constant expression that
+evaluates to /true/.]
+
+[:`is_scoped_enum<color&>::value` is an integral constant expression that
+evaluates to /false/.]
+
+[:`is_scoped_enum<color*>::value` is an integral constant expression that
+evaluates to /false/.]
+
+[:`is_scoped_enum<T>::value_type` is the type `bool`.]
+
+[endsect]

doc/is_unscoped_enum.qbk

@@ -0,0 +1,45 @@
+[/
+Copyright 2020 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License,
+Version 1.0. (See accompanying file LICENSE_1_0.txt
+or copy at http://www.boost.org/LICENSE_1_0.txt).
+]
+
+[section:is_unscoped_enum is_unscoped_enum]
+
+    template<class T>
+    struct is_unscoped_enum
+        : __tof { };
+
+__inherit If T is a (possibly cv-qualified) unscoped enumeration type
+(`enum` but not `enum class`), then inherits from __true_type, otherwise
+inherits from __false_type.
+
+__header `#include <boost/type_traits/is_unscoped_enum.hpp>`
+
+[all_compilers]
+
+__examples
+
+[:Given: `enum color { red, blue };` and `enum class fruit { apple, orange };`]
+
+[:`is_unscoped_enum<color>` inherits from `__true_type`.]
+
+[:`is_unscoped_enum<fruit>` inherits from `__false_type`.]
+
+[:`is_unscoped_enum<color const>::type` is the type `__true_type`.]
+
+[:`is_unscoped_enum<color>::value` is an integral constant expression that
+evaluates to /true/.]
+
+[:`is_unscoped_enum<color&>::value` is an integral constant expression that
+evaluates to /false/.]
+
+[:`is_unscoped_enum<color*>::value` is an integral constant expression that
+evaluates to /false/.]
+
+[:`is_unscoped_enum<T>::value_type` is the type `bool`.]
+
+[endsect]

doc/type_traits.qbk

@@ -55,6 +55,8 @@
 [def __is_unbounded_array [link boost_typetraits.reference.is_unbounded_array is_unbounded_array]]
 [def __is_union [link boost_typetraits.reference.is_union is_union]]
 [def __is_class [link boost_typetraits.reference.is_class is_class]]
+[def __is_scoped_enum [link boost_typetraits.reference.is_scoped_enum is_scoped_enum]]
+[def __is_unscoped_enum [link boost_typetraits.reference.is_unscoped_enum is_unscoped_enum]]
 [def __is_enum [link boost_typetraits.reference.is_enum is_enum]]
 [def __is_enum [link boost_typetraits.reference.is_enum is_enum]]
 [def __is_function [link boost_typetraits.reference.is_function is_function]]
@@ -434,10 +436,12 @@ See __has_trivial_constructor.
 [include is_rvalue_reference.qbk]
 [include is_same.qbk]
 [include is_scalar.qbk]
+[include is_scoped_enum.qbk]
 [include is_signed.qbk]
 [include is_stateless.qbk]
 [include is_unbounded_array.qbk]
 [include is_union.qbk]
+[include is_unscoped_enum.qbk]
 [include is_unsigned.qbk]
 [include is_virtual_base_of.qbk]
 [include is_void.qbk]