| /* |
| * Copyright (c) 2023, 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_UTILITIES_CHECKEDCAST_HPP |
| #define SHARE_UTILITIES_CHECKEDCAST_HPP |
| |
| #include "utilities/debug.hpp" |
| |
| // In many places we've added C-style casts to silence compiler |
| // warnings, for example when truncating a size_t to an int when we |
| // know the size_t is a small struct. Such casts are risky because |
| // they effectively disable useful compiler warnings. We can make our |
| // lives safer with this function, which ensures that any cast is |
| // reversible without loss of information. It doesn't check |
| // everything: it isn't intended to make sure that pointer types are |
| // compatible, for example. |
| template <typename T2, typename T1> |
| constexpr T2 checked_cast(T1 thing) { |
| T2 result = static_cast<T2>(thing); |
| assert(static_cast<T1>(result) == thing, "must be"); |
| return result; |
| } |
| |
| #endif // SHARE_UTILITIES_CHECKEDCAST_HPP |
| |
