122 lines
3.8 KiB
C++
122 lines
3.8 KiB
C++
// Copyright (c) 2010, Google Inc.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// ---
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// Author: Guilin Chen
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#ifndef UTIL_GTL_LIBC_ALLOCATOR_WITH_REALLOC_H_
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#define UTIL_GTL_LIBC_ALLOCATOR_WITH_REALLOC_H_
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#include <google/sparsehash/sparseconfig.h>
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#include <stdlib.h> // for malloc/realloc/free
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#include <stddef.h> // for ptrdiff_t
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_START_GOOGLE_NAMESPACE_
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template<class T>
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class libc_allocator_with_realloc {
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public:
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typedef T value_type;
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typedef size_t size_type;
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typedef ptrdiff_t difference_type;
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typedef T* pointer;
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typedef const T* const_pointer;
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typedef T& reference;
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typedef const T& const_reference;
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libc_allocator_with_realloc() {}
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libc_allocator_with_realloc(const libc_allocator_with_realloc&) {}
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~libc_allocator_with_realloc() {}
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pointer address(reference r) const { return &r; }
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const_pointer address(const_reference r) const { return &r; }
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pointer allocate(size_type n, const_pointer = 0) {
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return static_cast<pointer>(malloc(n * sizeof(value_type)));
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}
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void deallocate(pointer p, size_type) {
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free(p);
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}
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pointer reallocate(pointer p, size_type n) {
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return static_cast<pointer>(realloc(p, n * sizeof(value_type)));
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}
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size_type max_size() const {
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return static_cast<size_type>(-1) / sizeof(value_type);
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}
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void construct(pointer p, const value_type& val) {
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new(p) value_type(val);
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}
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void destroy(pointer p) { p->~value_type(); }
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template <class U>
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libc_allocator_with_realloc(const libc_allocator_with_realloc<U>&) {}
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template<class U>
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struct rebind {
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typedef libc_allocator_with_realloc<U> other;
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};
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};
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// libc_allocator_with_realloc<void> specialization.
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template<>
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class libc_allocator_with_realloc<void> {
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public:
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typedef void value_type;
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typedef size_t size_type;
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typedef ptrdiff_t difference_type;
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typedef void* pointer;
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typedef const void* const_pointer;
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template<class U>
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struct rebind {
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typedef libc_allocator_with_realloc<U> other;
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};
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};
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template<class T>
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inline bool operator==(const libc_allocator_with_realloc<T>&,
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const libc_allocator_with_realloc<T>&) {
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return true;
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}
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template<class T>
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inline bool operator!=(const libc_allocator_with_realloc<T>&,
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const libc_allocator_with_realloc<T>&) {
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return false;
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}
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_END_GOOGLE_NAMESPACE_
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#endif // UTIL_GTL_LIBC_ALLOCATOR_WITH_REALLOC_H_
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