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
77
78
79
80
81
82
83
84
85
86
87
88
|
#ifndef ADHOCUTIL_HANDLE_H
#define ADHOCUTIL_HANDLE_H
#include <utility>
#include "c++11Helpers.h"
namespace AdHoc {
/// A unique_ptr like construct for non-pointer objects.
/// Implements RAII.
template<typename T, typename D>
class Handle {
public:
/// Constructs a Handle that owns t, to be tidied with d
Handle(T t, D d) noexcept :
inst(std::move(t)),
deleter(std::move(d)),
owning(true)
{
}
/// Constructs a Handle that takes over ownership of h
Handle(Handle && h) noexcept :
inst(std::move(h.inst)),
deleter(std::move(h.deleter)),
owning(h.owning)
{
h.owning = false;
}
~Handle()
{
if (owning) {
deleter(inst);
}
}
/// Standard special members
SPECIAL_MEMBERS_COPY(Handle, delete);
/// Takes over ownership of h
Handle & operator=(Handle && h) noexcept
{
if (owning) {
deleter(inst);
}
inst = std::move(h.inst);
deleter = std::move(h.deleter);
owning = h.owning;
h.owning = false;
}
/// Returns a reference to the managed object.
[[nodiscard]] T & get() noexcept { return inst; }
/// Returns a const reference to the managed object.
[[nodiscard]] const T & get() const noexcept { return inst; }
/// Returns a pointer to the managed object.
[[nodiscard]] T * operator->() noexcept { return inst; }
/// Returns a const pointer to the managed object.
[[nodiscard]] const T * operator->() const noexcept { return inst; }
/// Returns a reference to the managed object.
[[nodiscard]] T & operator*() noexcept { return inst; }
/// Returns a const reference to the managed object.
[[nodiscard]] const T & operator*() const noexcept { return inst; }
/// Returns a reference to the managed object.
// NOLINTNEXTLINE(hicpp-explicit-conversions)
operator T &() noexcept { return inst; }
/// Returns a const reference to the managed object.
// NOLINTNEXTLINE(hicpp-explicit-conversions)
operator const T &() const noexcept { return inst; }
private:
T inst;
D deleter;
bool owning;
};
template<typename T, typename D, typename... Args>
Handle<T, D> make_handle(D && d, Args && ... args)
{
return { T(std::forward<Args>(args)...), std::forward<D>(d) };
}
}
#endif
|
