1 // Copyright 2014 Antony Polukhin.
2 //
3 // Distributed under the Boost Software License, Version 1.0.
4 // (See accompanying file LICENSE_1_0.txt
5 // or copy at http://www.boost.org/LICENSE_1_0.txt)
6
7 // For more information, see http://www.boost.org
8
9 #include <boost/function.hpp>
10 #include <boost/move/move.hpp>
11 #include <boost/core/lightweight_test.hpp>
12 #include <iostream>
13 #include <cstdlib>
14
15 #define BOOST_CHECK BOOST_TEST
16
17 class only_movable {
18 private:
19 BOOST_MOVABLE_BUT_NOT_COPYABLE(only_movable)
20 int value_;
21 bool moved_;
22
23 public:
only_movable(BOOST_RV_REF (only_movable)x)24 only_movable(BOOST_RV_REF(only_movable) x)
25 : value_(x.value_)
26 , moved_(false)
27 {
28 x.moved_ = true;
29 }
30
operator =(BOOST_RV_REF (only_movable)x)31 only_movable& operator=(BOOST_RV_REF(only_movable) x) {
32 value_ = x.value_;
33 x.moved_ = true;
34 moved_ = false;
35 return *this;
36 }
37
only_movable(int value=0)38 explicit only_movable(int value = 0) : value_(value), moved_(false) {}
get_value() const39 int get_value() const { return value_; }
is_moved() const40 bool is_moved() const { return moved_; }
41 };
42
43
one(BOOST_RV_REF (only_movable)v)44 int one(BOOST_RV_REF(only_movable) v) { return v.get_value(); }
two(BOOST_RV_REF (only_movable)t)45 only_movable two(BOOST_RV_REF(only_movable) t) {
46 only_movable t1 = boost::move(t);
47 return BOOST_MOVE_RET(only_movable, t1);
48 }
49
two_sum(BOOST_RV_REF (only_movable)t1,BOOST_RV_REF (only_movable)t2)50 only_movable two_sum(BOOST_RV_REF(only_movable) t1, BOOST_RV_REF(only_movable) t2) {
51 only_movable ret(t1.get_value() + t2.get_value());
52 return BOOST_MOVE_RET(only_movable, ret);
53 }
54
55 struct sum_struct {
operator ()sum_struct56 only_movable operator()(BOOST_RV_REF(only_movable) t1, BOOST_RV_REF(only_movable) t2) const {
57 only_movable ret(t1.get_value() + t2.get_value());
58 return BOOST_MOVE_RET(only_movable, ret);
59 }
60 };
61
62 #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
three(std::string &&)63 int three(std::string&&) { return 1; }
four(std::string && s)64 std::string&& four(std::string&& s) { return boost::move(s); }
65 #endif
66
main()67 int main()
68 {
69 using boost::function;
70
71 function <int(BOOST_RV_REF(only_movable))> f1 = one;
72
73 only_movable om1(1);
74 BOOST_CHECK(f1(boost::move(om1)) == 1);
75
76 function <only_movable(BOOST_RV_REF(only_movable))> f2 = two;
77
78 only_movable om2(2);
79 only_movable om2_2 = f2(boost::move(om2));
80 BOOST_CHECK(om2_2.get_value() == 2);
81 BOOST_CHECK(om2.is_moved());
82
83 {
84 function <only_movable(BOOST_RV_REF(only_movable), BOOST_RV_REF(only_movable))> f2_sum = two_sum;
85 only_movable om1_sum(1), om2_sum(2);
86 only_movable om2_sum_2 = f2_sum(boost::move(om1_sum), boost::move(om2_sum));
87 BOOST_CHECK(om2_sum_2.get_value() == 3);
88 }
89
90 {
91 sum_struct s;
92 function <only_movable(BOOST_RV_REF(only_movable), BOOST_RV_REF(only_movable))> f2_sum = s;
93 only_movable om1_sum(1), om2_sum(2);
94 only_movable om2_sum_2 = f2_sum(boost::move(om1_sum), boost::move(om2_sum));
95 BOOST_CHECK(om2_sum_2.get_value() == 3);
96 }
97
98 #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
99 function <int(std::string&&)> f3 = three;
100 function <std::string&& (std::string&& s)> f4 = four;
101
102 f3(std::string("Hello"));
103 BOOST_CHECK(f4(std::string("world")) == "world");
104 #endif
105
106 return boost::report_errors();
107 }
108