test_deleter.h revision bc8d3f97eb5c958007f2713238472e0c1c8fe02c 
1//===----------------------------------------------------------------------===//
2//
3// ��������������������The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10// <memory>
11
12// shared_ptr
13
14// Example move-only deleter
15
16#ifndef DELETER_H
17#define DELETER_H
18
19#include <type_traits>
20#include <cassert>
21
22struct test_deleter_base
23{
24    static int count;
25    static int dealloc_count;
26};
27
28int test_deleter_base::count = 0;
29int test_deleter_base::dealloc_count = 0;
30
31template <class T>
32class test_deleter
33    : public test_deleter_base
34{
35    int state_;
36
37public:
38
39    test_deleter() : state_(0) {++count;}
40    explicit test_deleter(int s) : state_(s) {++count;}
41    test_deleter(const test_deleter& d)
42        : state_(d.state_) {++count;}
43    ~test_deleter() {assert(state_ >= 0); --count; state_ = -1;}
44
45    int state() const {return state_;}
46    void set_state(int i) {state_ = i;}
47
48    void operator()(T* p) {assert(state_ >= 0); ++dealloc_count; delete p;}
49};
50
51template <class T>
52void
53swap(test_deleter<T>& x, test_deleter<T>& y)
54{
55    test_deleter<T> t(std::move(x));
56    x = std::move(y);
57    y = std::move(t);
58}
59
60#endif
61