first commit

test/test_ipc.cpp

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+#include <chrono>
+#include <cmath>
+#include <fmt/core.h>
+#include <thread>
+#include <unistd.h>
+
+#include "ipc/api.hpp"
+
+int
+main(int /* argc */, char** /* argv */)
+{
+    using ipc::Ipc;
+    using fmt::format;
+    using fmt::print;
+    using namespace std::chrono_literals;
+
+    int verbose = 0;
+
+    // custom name
+#if defined(_WIN32)
+    auto name = format("custom_fifo_ipc_{}", getpid());
+#else
+    auto name = format("/tmp/custom_fifo_ipc_{}", getpid());
+#endif
+    print("\n{}\n\n", name);
+    ipc::init(name, 0600);
+
+    std::thread server_thread([name, verbose] {
+        print("[server] pre-start\n");
+        std::this_thread::sleep_for(1s);
+
+        auto server = Ipc(name, true, verbose);
+        print("[server] start\n");
+
+        int value;
+        double result;
+        while(1) {
+            {
+                server.read(value);
+                print("[server] read int({})\n", value);
+            }
+
+            {
+                // result = value * value;
+                result = std::sqrt(value);
+                server.write(result);
+                print("[server] write double({:.2e})\n", result);
+            }
+        }
+    });
+
+    print("[client] pre-start\n");
+    auto client = Ipc(name, false, verbose);
+    print("[client] start\n");
+
+    double answer;
+    auto hline = "\n------------------------\n";
+    for (int i = 2; i <= 5; ++i) {
+        std::this_thread::sleep_for(500ms);
+        print(hline);
+
+        {
+            client.write(i);
+            print("[client] write int({})\n", i);
+        }
+
+        {
+            client.read(answer);
+            print("[client] read double({:.2e})\n", answer);
+        }
+    }
+
+    print(hline);
+    print("[client] finish the work\n\n");
+
+    return 0;
+}