blob: 94f3ae87bc8fef4a5afee33afec7ad0be44bcde8 (
plain)
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
|
#pragma once
#include "PreConfig.hpp"
#include <memory>
#include <type_traits>
namespace cru {
template <typename T>
class SelfResolvable;
template <typename T>
class ObjectResolver {
friend SelfResolvable<T>;
private:
ObjectResolver(const std::shared_ptr<T*>& resolver) : resolver_(resolver) {}
public:
ObjectResolver(const ObjectResolver&) = default;
ObjectResolver& operator=(const ObjectResolver&) = default;
ObjectResolver(ObjectResolver&&) = default;
ObjectResolver& operator=(ObjectResolver&&) = default;
~ObjectResolver() = default;
T* Resolve() const {
// resolver_ is null only when this has been moved.
// You shouldn't resolve a moved resolver. So assert it.
Expects(resolver_);
return *resolver_;
}
private:
std::shared_ptr<T*> resolver_;
};
template <typename T>
class SelfResolvable {
public:
SelfResolvable() : resolver_(new T*(static_cast<T*>(this))) {}
SelfResolvable(const SelfResolvable&) = delete;
SelfResolvable& operator=(const SelfResolvable&) = delete;
SelfResolvable(SelfResolvable&&) = delete;
SelfResolvable& operator=(SelfResolvable&&) = delete;
virtual ~SelfResolvable() { (*resolver_) = nullptr; }
ObjectResolver<T> CreateResolver() { return ObjectResolver<T>(resolver_); }
private:
std::shared_ptr<T*> resolver_;
};
} // namespace cru
|
