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_UTILITIES_CHECKEDCAST_HPP
26 #define SHARE_UTILITIES_CHECKEDCAST_HPP
27
28 #include "utilities/debug.hpp"
29
30 // In many places we've added C-style casts to silence compiler
31 // warnings, for example when truncating a size_t to an int when we
32 // know the size_t is a small struct. Such casts are risky because
33 // they effectively disable useful compiler warnings. We can make our
34 // lives safer with this function, which ensures that any cast is
35 // reversible without loss of information. It doesn't check
36 // everything: it isn't intended to make sure that pointer types are
37 // compatible, for example.
38 template <typename T2, typename T1>
39 constexpr T2 checked_cast(T1 thing) {
40 T2 result = static_cast<T2>(thing);
41 assert(static_cast<T1>(result) == thing, "must be");
42 return result;
43 }
44
45 #endif // SHARE_UTILITIES_CHECKEDCAST_HPP
46
|
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_UTILITIES_CHECKEDCAST_HPP
26 #define SHARE_UTILITIES_CHECKEDCAST_HPP
27
28 #include "utilities/debug.hpp"
29 #include "utilities/globalDefinitions.hpp"
30
31 // In many places we've added C-style casts to silence compiler
32 // warnings, for example when truncating a size_t to an int when we
33 // know the size_t is a small struct. Such casts are risky because
34 // they effectively disable useful compiler warnings. We can make our
35 // lives safer with this function, which ensures that any cast is
36 // reversible without loss of information. It doesn't check
37 // everything: it isn't intended to make sure that pointer types are
38 // compatible, for example.
39 template <typename T2, typename T1>
40 constexpr T2 checked_cast(T1 thing) {
41 T2 result = static_cast<T2>(thing);
42 assert(static_cast<T1>(result) == thing, "must be, thing: " INTPTR_FORMAT ", result: " INTPTR_FORMAT, (intptr_t)thing, (intptr_t)result);
43 return result;
44 }
45
46 #endif // SHARE_UTILITIES_CHECKEDCAST_HPP
47
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