Implement data and size functions

test/size_test.cpp

@@ -0,0 +1,42 @@
+/*
+Copyright 2023 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#include <boost/config.hpp>
+#if !defined(BOOST_NO_CXX11_CONSTEXPR) && !defined(BOOST_NO_CXX11_DECLTYPE)
+#include <boost/core/size.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+struct range {
+    std::size_t size() const {
+        return 4;
+    }
+};
+
+void test_range()
+{
+    range c;
+    BOOST_TEST_EQ(boost::size(c), 4);
+}
+
+void test_array()
+{
+    int a[4];
+    BOOST_TEST_EQ(boost::size(a), 4);
+}
+
+int main()
+{
+    test_range();
+    test_array();
+    return boost::report_errors();
+}
+#else
+int main()
+{
+    return 0;
+}
+#endif