forked from boostorg/endian
Add detail/is_scoped_enum.hpp
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35
include/boost/endian/detail/is_scoped_enum.hpp
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35
include/boost/endian/detail/is_scoped_enum.hpp
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#ifndef BOOST_ENDIAN_DETAIL_IS_SCOPED_ENUM_HPP_INCLUDED
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#define BOOST_ENDIAN_DETAIL_IS_SCOPED_ENUM_HPP_INCLUDED
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// Copyright 2020 Peter Dimov
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//
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// Distributed under the Boost Software License, Version 1.0.
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// https://www.boost.org/LICENSE_1_0.txt
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#include <boost/type_traits/conditional.hpp>
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#include <boost/type_traits/is_enum.hpp>
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#include <boost/type_traits/is_convertible.hpp>
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namespace boost
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{
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namespace endian
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{
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namespace detail
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{
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template<class T> struct negation: boost::integral_constant<bool, !T::value> {};
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template<class T> struct is_scoped_enum:
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boost::conditional<
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boost::is_enum<T>::value,
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negation<boost::is_convertible<T, int>>,
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boost::false_type
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>::type
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{
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};
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} // namespace detail
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} // namespace endian
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} // namespace boost
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#endif // BOOST_ENDIAN_DETAIL_IS_SCOPED_ENUM_HPP_INCLUDED
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@ -96,3 +96,5 @@ run-ni endian_hpp_test.cpp ;
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run order_test.cpp ;
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run endian_reverse_test2.cpp ;
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run is_scoped_enum_test.cpp ;
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68
test/is_scoped_enum_test.cpp
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68
test/is_scoped_enum_test.cpp
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// Copyright 2020 Peter Dimov
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// Distributed under the Boost Software License, Version 1.0.
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// https://www.boost.org/LICENSE_1_0.txt
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#include <boost/endian/detail/is_scoped_enum.hpp>
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#include <boost/core/lightweight_test_trait.hpp>
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#include <boost/config.hpp>
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enum E1 {};
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#if !defined(BOOST_NO_CXX11_SCOPED_ENUMS)
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enum E2: long {};
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enum class E3 {};
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enum class E4: long {};
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#endif
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struct X
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{
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operator int() const { return 0; }
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};
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struct Y;
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template<class T> void test_true()
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{
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using boost::endian::detail::is_scoped_enum;
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BOOST_TEST_TRAIT_TRUE((is_scoped_enum<T>));
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BOOST_TEST_TRAIT_TRUE((is_scoped_enum<T const>));
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BOOST_TEST_TRAIT_TRUE((is_scoped_enum<T volatile>));
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BOOST_TEST_TRAIT_TRUE((is_scoped_enum<T const volatile>));
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}
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template<class T> void test_false()
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{
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using boost::endian::detail::is_scoped_enum;
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BOOST_TEST_TRAIT_FALSE((is_scoped_enum<T>));
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BOOST_TEST_TRAIT_FALSE((is_scoped_enum<T const>));
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BOOST_TEST_TRAIT_FALSE((is_scoped_enum<T volatile>));
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BOOST_TEST_TRAIT_FALSE((is_scoped_enum<T const volatile>));
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}
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int main()
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{
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test_false<int>();
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test_false<bool>();
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test_false<X>();
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test_false<Y>();
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test_false<void>();
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test_false<int[]>();
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test_false<int[1]>();
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test_false<E1>();
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#if !defined(BOOST_NO_CXX11_SCOPED_ENUMS)
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test_false<E2>();
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test_true<E3>();
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test_true<E4>();
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#endif
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return boost::report_errors();
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}
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