1 /**************************************************************************
3 * Copyright 2011-2012 Jose Fonseca
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 **************************************************************************/
26 #ifndef _SCOPED_ALLOCATOR_HPP_
27 #define _SCOPED_ALLOCATOR_HPP_
36 * Similar to alloca(), but implemented with malloc.
51 /* Always return valid address, even when size is zero */
52 size = std::max(size, sizeof(uintptr_t));
54 uintptr_t * buf = static_cast<uintptr_t *>(malloc(sizeof(uintptr_t) + size));
60 next = reinterpret_cast<uintptr_t>(buf);
61 assert((next & 1) == 0);
63 return static_cast<void *>(&buf[1]);
68 alloc(size_t size = 1) {
69 return static_cast<T *>(alloc(sizeof(T) * size));
73 * Prevent this pointer from being automatically freed.
79 reinterpret_cast<uintptr_t *>(ptr)[-1] |= 1;
86 uintptr_t temp = *reinterpret_cast<uintptr_t *>(next);
92 free(reinterpret_cast<void *>(next));
101 #endif /* _SCOPED_ALLOCATOR_HPP_ */