blob: bcf24578de2735a5c80b249b5dab2a32c08fb926 (
plain) (
blame)
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
|
//
// immer: immutable data structures for C++
// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
//
// This software is distributed under the Boost Software License, Version 1.0.
// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
//
#pragma once
#include <immer/refcount/no_refcount_policy.hpp>
#include <atomic>
#include <utility>
namespace immer {
/*!
* A reference counting policy implemented using a raw `int` count.
* It is **not thread-safe**.
*/
struct unsafe_refcount_policy
{
using spinlock_type = no_spinlock;
mutable int refcount;
unsafe_refcount_policy()
: refcount{1} {};
unsafe_refcount_policy(disowned)
: refcount{0}
{}
void inc() { ++refcount; }
bool dec() { return --refcount == 0; }
void dec_unsafe() { --refcount; }
bool unique() { return refcount == 1; }
};
} // namespace immer
|
