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
|
#pragma once
#include <type_traits>
#include <utility>
namespace c10 {
/**
* Mostly copied from https://llvm.org/doxygen/ScopeExit_8h_source.html
*/
template <typename Callable>
class scope_exit {
Callable ExitFunction;
bool Engaged = true; // False once moved-from or release()d.
public:
template <typename Fp>
// NOLINTNEXTLINE(bugprone-forwarding-reference-overload)
explicit scope_exit(Fp&& F) : ExitFunction(std::forward<Fp>(F)) {}
scope_exit(scope_exit&& Rhs) noexcept
: ExitFunction(std::move(Rhs.ExitFunction)), Engaged(Rhs.Engaged) {
Rhs.release();
}
scope_exit(const scope_exit&) = delete;
scope_exit& operator=(scope_exit&&) = delete;
scope_exit& operator=(const scope_exit&) = delete;
void release() {
Engaged = false;
}
~scope_exit() {
if (Engaged) {
ExitFunction();
}
}
};
// Keeps the callable object that is passed in, and execute it at the
// destruction of the returned object (usually at the scope exit where the
// returned object is kept).
//
// Interface is specified by p0052r2.
template <typename Callable>
scope_exit<std::decay_t<Callable>> make_scope_exit(Callable&& F) {
return scope_exit<std::decay_t<Callable>>(std::forward<Callable>(F));
}
} // namespace c10
|
