Newer
Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
// -*- tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set ts=8 sw=2 et sts=2:
#ifndef DUNE_COMMON_STD_MEMORY_HH
#define DUNE_COMMON_STD_MEMORY_HH
#include <memory>
#include <utility>
namespace Dune
{
namespace Std
{
// Helper struct to distinguish non-array, unknown bound
// array, and known bound array types using SFINAE
// following proposal N3656 by Stephan T. Lavavej.
template<class T>
struct MakeUniqueHelper
{
typedef std::unique_ptr<T> NonArrayUniquePtr;
};
template<class T>
struct MakeUniqueHelper<T[]>
{
typedef std::unique_ptr<T[]> UnknownBoundArrayUniquePtr;
typedef T RawType;
};
template<class T, size_t N>
struct MakeUniqueHelper<T[N]>
{
typedef void KnownBoundArrayUniquePtr;
};
/** \brief Implementation of std::make_unique to be introduced in C++14
*
* \tparam T Nonarray type of object to be constructed
* \tparam ...Args Parameter types for constructor of T
*
* \param args Arguments to be passed to constructor of T
*
* This fallback implementation using perfect forwarding
* as proposed by Herb Sutter in http://herbsutter.com/gotw/_102/
*/
template<typename T, typename... Args>
typename MakeUniqueHelper<T>::NonArrayUniquePtr
make_unique(Args&&... args)
{
return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
}
/** \brief Implementation of std::make_unique to be introduced in C++14
*
* \tparam T Array type of unknown bound
*
* \param n Size of array to allocate
*/
template<typename T>
typename MakeUniqueHelper<T>::UnknownBoundArrayUniquePtr
make_unique(size_t n)
{
return std::unique_ptr<T>(new typename MakeUniqueHelper<T>::RawType[n]());
}
/** \brief Implementation of std::make_unique to be introduced in C++14
*
* \tparam T Array type of known bound
* \tparam Args Dummy arguments
*
* This is deleted, since, according to the standard this should not
* participate in overload resolution
*
* \param args Dummy arguments
*/
template<typename T, typename ...Args>
typename MakeUniqueHelper<T>::KnownBoundArrayUniquePtr
make_unique(Args&&... args) = delete;
} // namespace Std
} // namespace Dune
#endif // #ifndef DUNE_COMMON_STD_MEMORY_HH