| /* |
| * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #ifndef SHARE_VM_METAPROGRAMMING_INTEGRALCONSTANT_HPP |
| #define SHARE_VM_METAPROGRAMMING_INTEGRALCONSTANT_HPP |
| |
| #include "memory/allocation.hpp" |
| |
| // An Integral Constant is a class providing a compile-time value of an |
| // integral type. An Integral Constant is also a nullary metafunction, |
| // returning itself. An integral constant object is implicitly |
| // convertible to the associated value. |
| // |
| // A type n is a model of Integral Constant if it meets the following |
| // requirements: |
| // |
| // n::ValueType : The integral type of n::value |
| // n::value : An integral constant expression |
| // n::type : IsSame<n::type, n>::value is true |
| // n::value_type const c = n() : c == n::value |
| |
| // A model of the Integer Constant concept. |
| // T is an integral type, and is the value_type. |
| // v is an integral constant, and is the value. |
| template<typename T, T v> |
| struct IntegralConstant : AllStatic { |
| typedef T value_type; |
| static const value_type value = v; |
| typedef IntegralConstant<T, v> type; |
| operator value_type() { return value; } |
| }; |
| |
| // A bool valued IntegralConstant whose value is true. |
| typedef IntegralConstant<bool, true> TrueType; |
| |
| // A bool valued IntegralConstant whose value is false. |
| typedef IntegralConstant<bool, false> FalseType; |
| |
| #endif // SHARE_VM_METAPROGRAMMING_INTEGRALCONSTANT_HPP |