OSX/libsecurity_utilities/lib/casts.h

   1 /*
   2  * Copyright (c) 2016 Apple Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #ifndef casts_h
  25 #define casts_h
  26
  27 #include <stdexcept>
  28 #include <security_utilities/debugging.h>
  29 #include <syslog.h>
  30
  31 template<typename TSource, typename TResult>
  32 static inline TResult int_cast(TSource value) {
  33     // TODO: if we're using C++11, we should do some static_asserts on the signedness of these types
  34     TResult result = static_cast<TResult>(value);
  35
  36     if (static_cast<TSource>(result) != value) {
  37 #ifndef NDEBUG
  38         syslog(LOG_ERR, "%s: casted value out of range", __PRETTY_FUNCTION__);
  39 #endif
  40         secnotice("int_cast", "casted value out of range");
  41         throw std::out_of_range("int_cast: casted value out of range");
  42     }
  43     return result;
  44 }
  45
  46 #endif /* casts_h */