remove free funcction is_empty

Author: alfC

include/boost/multi/array_ref.hpp

@@ -261,7 +261,7 @@ struct array_types : private Layout {  // cppcheck-suppress syntaxError ; false
 
 	friend constexpr auto                size(array_types const& self) noexcept -> size_type { return self.size(); }
 	friend BOOST_MULTI_HD constexpr auto extension(array_types const& self) noexcept -> extension_type { return self.extension(); }
-	friend constexpr auto                is_empty(array_types const& self) noexcept -> bool { return self.is_empty(); }
+	// friend constexpr auto                is_empty(array_types const& self) noexcept -> bool { return self.is_empty(); }
 	friend constexpr auto                num_elements(array_types const& self) noexcept -> size_type { return self.num_elements(); }
 
 	friend constexpr auto extensions(array_types const& self) noexcept -> extensions_type { return self.extensions(); }

test/assignments.cpp

@@ -171,7 +171,7 @@ auto main() -> int {  // NOLINT(readability-function-cognitive-complexity,bugpro
 
 			BOOST_TEST( vec[9] == val );  // cppcheck-suppress containerOutOfBounds ;
 			BOOST_TEST( !vec.empty() );
-			BOOST_TEST( !is_empty(arr) );
+			BOOST_TEST( !arr.is_empty() );
 		}
 		{
 			std::vector<int> vec(5 * 7L, 99);  // NOLINT(fuchsia-default-arguments-calls)

test/move.cpp

@@ -268,7 +268,7 @@ auto main() -> int {  // NOLINT(readability-function-cognitive-complexity,bugpro
 		std::vector<multi::array<int, 2>> Av(10, multi::array<int, 2>({4, 5}, 990));  // std::vector NOLINT(fuchsia-default-arguments-calls)
 		multi::array<int, 2>              arr2(std::move(Av[0]), std::allocator<int>{});
 
-		BOOST_TEST( is_empty(Av[0]) );
+		BOOST_TEST( Av[0].is_empty() );
 		BOOST_TEST( size(arr2) == 4 );
 		BOOST_TEST( arr2[1][2] == 990 );
 	}
@@ -282,7 +282,7 @@ auto main() -> int {  // NOLINT(readability-function-cognitive-complexity,bugpro
 		std::move(begin(Av), end(Av), std::back_inserter(Bv));  // NOLINT(modernize-use-ranges) for C++20
 
 		BOOST_TEST( size(Bv) == size(Av) );
-		BOOST_TEST( is_empty(Av[4]) );
+		BOOST_TEST( Av[4].is_empty() );
 		BOOST_TEST( size(Bv[5]) == 4 );
 		BOOST_TEST( Bv[5][1][2] == 990 );
 	}
@@ -297,7 +297,7 @@ auto main() -> int {  // NOLINT(readability-function-cognitive-complexity,bugpro
 		std::move(begin(Av), end(Av), std::back_inserter(Bv));  // NOLINT(modernize-use-ranges) for C++20
 
 		BOOST_TEST( size(Bv) == size(Av) );
-		BOOST_TEST( is_empty(Av[4]) );
+		BOOST_TEST( Av[4].is_empty() );
 		BOOST_TEST( size(Bv[5]) == 4 );
 		BOOST_TEST( Bv[5][1][2] == 990 );
 	}