| 61 | // Copy and move semantics with a user-defined type. |
| 62 | |
| 63 | int main() |
| 64 | { |
| 65 | msd::static_channel<data, 10> chan{}; |
| 66 | |
| 67 | // l-value: will be copied |
| 68 | const auto in1 = data{1}; |
| 69 | chan << in1; |
| 70 | |
| 71 | // r-value: will be moved |
| 72 | chan << data{2}; |
| 73 | |
| 74 | // l-value -> std::move -> r-value: will be moved |
| 75 | auto in3 = data{3}; |
| 76 | chan << std::move(in3); |
| 77 | |
| 78 | std::vector<int> actual; |
| 79 | |
| 80 | // Each value will be moved when read |
| 81 | for (const data& out : chan) { |
| 82 | std::cout << out.get_value() << '\n'; |
| 83 | |
| 84 | actual.push_back(out.get_value()); |
| 85 | |
| 86 | if (chan.empty()) { |
| 87 | break; |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | // Read values |
| 92 | const std::vector<int> expected{1, 2, 3}; |
| 93 | |
| 94 | if (actual != expected) { |
| 95 | std::cerr << "Error: got: "; |
| 96 | for (const int value : actual) { |
| 97 | std::cerr << value << ", "; |
| 98 | } |
| 99 | |
| 100 | std::cerr << ", expected: "; |
| 101 | for (const int value : expected) { |
| 102 | std::cerr << value << ", "; |
| 103 | } |
| 104 | std::cerr << '\n'; |
| 105 | |
| 106 | std::terminate(); |
| 107 | } |
| 108 | |
| 109 | // 1 copy when in1 was written |
| 110 | constexpr std::size_t expected_copies = 1; |
| 111 | |
| 112 | if (data::copies_ != expected_copies) { |
| 113 | std::cerr << "Error: copies: " << data::copies_ << ", expected: " << expected_copies << '\n'; |
| 114 | std::terminate(); |
| 115 | } |
| 116 | |
| 117 | // 1 move when the second value was written |
| 118 | // 1 move when in3 was written |
| 119 | // 3 moves when the 3 values were read |
| 120 | constexpr std::size_t expected_moves = 5; |