1 /* 2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_UTILITIES_TRAITS_IS_CLASS_OR_UNION_HPP 26 #define SHARE_VM_UTILITIES_TRAITS_IS_CLASS_OR_UNION_HPP 27 28 /** 29 * IsClassOrUnion<T>::value is true iff the type T is a class or union type. 30 */ 31 template<typename T> 32 class IsClassOrUnion { 33 typedef char yes[1]; 34 typedef char no[2]; 35 36 template<typename U> 37 static yes &check(int U::*); 38 39 template<typename> 40 static no &check(...); 41 42 public: 43 static const bool value = (sizeof(check<T>(0)) == sizeof(yes)); 44 }; 45 46 #endif // SHARE_VM_UTILITIES_TRAITS_IS_CLASS_OR_UNION_HPP 47