// Copyright (c) 2010, 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,
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// ---

#ifndef UTIL_GTL_LIBC_ALLOCATOR_WITH_REALLOC_H_
#define UTIL_GTL_LIBC_ALLOCATOR_WITH_REALLOC_H_

#include <mapnik/sparsehash/internal/sparseconfig.h>
#include <stdlib.h> // for malloc/realloc/free
#include <stddef.h> // for ptrdiff_t
#include <new>      // for placement new

_START_GOOGLE_NAMESPACE_

template<class T>
class libc_allocator_with_realloc
{
  public:
    typedef T value_type;
    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;

    libc_allocator_with_realloc() {}
    libc_allocator_with_realloc(const libc_allocator_with_realloc&) {}
    ~libc_allocator_with_realloc() {}

    pointer address(reference r) const { return &r; }
    const_pointer address(const_reference r) const { return &r; }

    pointer allocate(size_type n, const_pointer = 0) { return static_cast<pointer>(malloc(n * sizeof(value_type))); }
    void deallocate(pointer p, size_type) { free(p); }
    pointer reallocate(pointer p, size_type n) { return static_cast<pointer>(realloc(p, n * sizeof(value_type))); }

    size_type max_size() const { return static_cast<size_type>(-1) / sizeof(value_type); }

    void construct(pointer p, const value_type& val) { new (p) value_type(val); }
    void destroy(pointer p) { p->~value_type(); }

    template<class U>
    libc_allocator_with_realloc(const libc_allocator_with_realloc<U>&)
    {}

    template<class U>
    struct rebind
    {
        typedef libc_allocator_with_realloc<U> other;
    };
};

// libc_allocator_with_realloc<void> specialization.
template<>
class libc_allocator_with_realloc<void>
{
  public:
    typedef void value_type;
    typedef size_t size_type;
    typedef ptrdiff_t difference_type;
    typedef void* pointer;
    typedef const void* const_pointer;

    template<class U>
    struct rebind
    {
        typedef libc_allocator_with_realloc<U> other;
    };
};

template<class T>
inline bool operator==(const libc_allocator_with_realloc<T>&, const libc_allocator_with_realloc<T>&)
{
    return true;
}

template<class T>
inline bool operator!=(const libc_allocator_with_realloc<T>&, const libc_allocator_with_realloc<T>&)
{
    return false;
}

_END_GOOGLE_NAMESPACE_

#endif // UTIL_GTL_LIBC_ALLOCATOR_WITH_REALLOC_H_
