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- // -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
- /* Copyright (c) 2006, Google Inc.
- * 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 Google Inc. 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.
- *
- * ---
- * Author: Maxim Lifantsev
- */
- #ifndef BASE_STL_ALLOCATOR_H_
- #define BASE_STL_ALLOCATOR_H_
- #include <config.h>
- #include <stddef.h> // for ptrdiff_t
- #include <limits>
- #include "base/logging.h"
- // Generic allocator class for STL objects
- // that uses a given type-less allocator Alloc, which must provide:
- // static void* Alloc::Allocate(size_t size);
- // static void Alloc::Free(void* ptr, size_t size);
- //
- // STL_Allocator<T, MyAlloc> provides the same thread-safety
- // guarantees as MyAlloc.
- //
- // Usage example:
- // set<T, less<T>, STL_Allocator<T, MyAlloc> > my_set;
- // CAVEAT: Parts of the code below are probably specific
- // to the STL version(s) we are using.
- // The code is simply lifted from what std::allocator<> provides.
- template <typename T, class Alloc>
- class STL_Allocator {
- public:
- typedef size_t size_type;
- typedef ptrdiff_t difference_type;
- typedef T* pointer;
- typedef const T* const_pointer;
- typedef T& reference;
- typedef const T& const_reference;
- typedef T value_type;
- template <class T1> struct rebind {
- typedef STL_Allocator<T1, Alloc> other;
- };
- STL_Allocator() { }
- STL_Allocator(const STL_Allocator&) { }
- template <class T1> STL_Allocator(const STL_Allocator<T1, Alloc>&) { }
- ~STL_Allocator() { }
- pointer address(reference x) const { return &x; }
- const_pointer address(const_reference x) const { return &x; }
- pointer allocate(size_type n, const void* = 0) {
- RAW_DCHECK((n * sizeof(T)) / sizeof(T) == n, "n is too big to allocate");
- return static_cast<T*>(Alloc::Allocate(n * sizeof(T)));
- }
- void deallocate(pointer p, size_type n) { Alloc::Free(p, n * sizeof(T)); }
- size_type max_size() const { return size_t(-1) / sizeof(T); }
- void construct(pointer p, const T& val) { ::new(p) T(val); }
- void construct(pointer p) { ::new(p) T(); }
- void destroy(pointer p) { p->~T(); }
- // There's no state, so these allocators are always equal
- bool operator==(const STL_Allocator&) const { return true; }
- };
- #endif // BASE_STL_ALLOCATOR_H_
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