add example foo.cpp

1 files changed, 39 insertions, 0 deletions

diff --git a/foo.cpp b/foo.cpp
new file mode 100644
index 0000000..a7891bb
--- /dev/null
+++ b/foo.cpp
@@ -0,0 +1,39 @@
+#include <array>
+#include <cstddef>
+#include <exception>
+#include <functional>
+#include <iostream>
+#include <mutex>
+#include <thread>
+
+namespace {
+
+struct Counter {
+    std::mutex mtx;
+    std::size_t impl = 0;
+};
+
+void do_something(Counter& counter) {
+    std::lock_guard<std::mutex> lck{counter.mtx};
+    ++counter.impl;
+    std::cout << "Doing something #" << counter.impl << '\n';
+}
+
+}
+
+int main() {
+    try {
+        Counter counter;
+        std::array<std::thread, 3> workers;
+        for (auto& worker : workers) {
+            worker = std::thread{&do_something, std::ref(counter)};
+        }
+        for (auto& worker : workers) {
+            worker.join();
+        }
+    } catch (const std::exception& e) {
+        std::cerr << e.what() << '\n';
+        return 1;
+    }
+    return 0;
+}