safe_cast: add a new cast function for casts that should always succeed.
In DEBUG mode, this does a dynamic_cast and asserts that the result is non null. Otherwise, it just does a static_cast. Again, this is only intended for cases where the cast should always succeed and what's desired is a debugging check to make sure.
This commit is contained in:
parent
27e8f3c98a
commit
194f0310d3
68
src/base/cast.hh
Normal file
68
src/base/cast.hh
Normal file
|
@ -0,0 +1,68 @@
|
|||
/*
|
||||
* Copyright (c) 2008 The Hewlett-Packard Development Company
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions are
|
||||
* met: redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer;
|
||||
* redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution;
|
||||
* neither the name of the copyright holders nor the names of its
|
||||
* contributors may be used to endorse or promote products derived from
|
||||
* this software without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
||||
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
||||
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||||
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
||||
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
||||
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
||||
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||||
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
||||
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
||||
* Authors: Nathan Binkert
|
||||
*/
|
||||
|
||||
#ifndef __BASE_CAST_HH__
|
||||
#define __BASE_CAST_HH__
|
||||
|
||||
#include <cassert>
|
||||
|
||||
// This is designed for situations where we have a pointer to a base
|
||||
// type, but in all cases when we cast it to a derived type, we know
|
||||
// by construction that it should work correctly.
|
||||
|
||||
#if defined(DEBUG)
|
||||
|
||||
// In debug builds, do the dynamic cast and assert the result is good
|
||||
|
||||
template <class T, class U>
|
||||
inline T
|
||||
safe_cast(U ptr)
|
||||
{
|
||||
T ret = dynamic_cast<T>(ptr);
|
||||
assert(ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
#else
|
||||
|
||||
// In non debug builds statically cast the result to the pointer we
|
||||
// want to use. This is technically unsafe, but this is only for
|
||||
// cases where we know that this should work by construction.
|
||||
|
||||
template <class T, class U>
|
||||
inline T
|
||||
safe_cast(U ptr)
|
||||
{
|
||||
return static_cast<T>(ptr);
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
#endif // __BASE_CAST_HH__
|
Loading…
Reference in a new issue