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mallocallocator.hh
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1 // -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
2 // vi: set et ts=4 sw=2 sts=2:
3 #ifndef DUNE_MALLOC_ALLOCATOR_HH
4 #define DUNE_MALLOC_ALLOCATOR_HH
5 
6 #include <exception>
7 #include <cstdlib>
8 #include <new>
9 #include <utility>
10 #include <dune/common/unused.hh>
11 
16 namespace Dune
17 {
22  template <class T>
24  public:
25  typedef std::size_t size_type;
26  typedef std::ptrdiff_t difference_type;
27  typedef T* pointer;
28  typedef const T* const_pointer;
29  typedef T& reference;
30  typedef const T& const_reference;
31  typedef T value_type;
32  template <class U> struct rebind {
34  };
35 
37  MallocAllocator() throw() {}
39  template <class U>
42  ~MallocAllocator() throw() {}
43 
45  {
46  return &x;
47  }
49  {
50  return &x;
51  }
52 
55  const void* hint = 0)
56  {
58  if (n > this->max_size())
59  throw std::bad_alloc();
60 
61  pointer ret = static_cast<pointer>(std::malloc(n * sizeof(T)));
62  if (!ret)
63  throw std::bad_alloc();
64  return ret;
65  }
66 
69  {
71  std::free(p);
72  }
73 
75  size_type max_size() const throw()
76  {
77  return size_type(-1) / sizeof(T);
78  }
79 
81  void construct(pointer p, const T& val)
82  {
83  ::new((void*)p)T(val);
84  }
85 
87  template<typename ... _Args>
88  void construct(pointer p, _Args&&... __args)
89  {
90  ::new((void *)p)T(std::forward<_Args>(__args) ...);
91  }
92 
94  void destroy(pointer p)
95  {
96  p->~T();
97  }
98  };
99 }
100 
101 #endif // DUNE_MALLOC_ALLOCATOR_HH
~MallocAllocator()
cleanup this allocator
Definition: mallocallocator.hh:42
Definition of the DUNE_UNUSED macro for the case that config.h is not available.
Definition: mallocallocator.hh:32
T * pointer
Definition: mallocallocator.hh:27
const T * const_pointer
Definition: mallocallocator.hh:28
T value_type
Definition: mallocallocator.hh:31
const T & const_reference
Definition: mallocallocator.hh:30
void destroy(pointer p)
destroy an object of type T (i.e. call the destructor)
Definition: mallocallocator.hh:94
void deallocate(pointer p, size_type n)
deallocate n objects of type T at address p
Definition: mallocallocator.hh:68
MallocAllocator< U > other
Definition: mallocallocator.hh:33
void construct(pointer p, _Args &&...__args)
construct an object of type T from variadic parameters
Definition: mallocallocator.hh:88
void construct(pointer p, const T &val)
copy-construct an object of type T (i.e. make a placement new on p)
Definition: mallocallocator.hh:81
MallocAllocator()
create a new MallocAllocator
Definition: mallocallocator.hh:37
#define DUNE_UNUSED_PARAMETER(parm)
A macro to mark intentionally unused function parameters with.
Definition: unused.hh:18
size_type max_size() const
max size for allocate
Definition: mallocallocator.hh:75
pointer allocate(size_type n, const void *hint=0)
allocate n objects of type T
Definition: mallocallocator.hh:54
Allocators implementation which simply calls malloc/free.
Definition: mallocallocator.hh:23
T & reference
Definition: mallocallocator.hh:29
std::size_t size_type
Definition: mallocallocator.hh:25
std::ptrdiff_t difference_type
Definition: mallocallocator.hh:26
MallocAllocator(const MallocAllocator< U > &)
copy construct from an other MallocAllocator, possibly for a different result type ...
Definition: mallocallocator.hh:40
const_pointer address(const_reference x) const
Definition: mallocallocator.hh:48
pointer address(reference x) const
Definition: mallocallocator.hh:44