initial

modules/network/include/NetworkResult.hpp

@@ -0,0 +1,59 @@
+#pragma once
+
+#include <cstring>
+#include <functional>
+#include <fmt/format.h>
+
+namespace tw::net {
+
+
+class NetworkResult {
+private:
+    int m_errno;
+
+    NetworkResult(int e) :
+        m_errno(e) 
+    {
+        
+    }
+
+public:
+    bool is(int err) {
+        return m_errno == err;
+    }
+
+    inline bool is_ok() {
+        return m_errno == 0;
+    }
+
+    static NetworkResult ok() {
+        return {0};
+    }
+
+    static NetworkResult from_errno(int e) {
+        return NetworkResult(e);
+    }
+
+    NetworkResult& and_then(std::function<void(NetworkResult)> handler) {
+        if(!is_ok()) {
+            handler(*this);
+        }
+        return *this;
+    }
+
+    const char* mesg() const {
+        return strerror(m_errno);
+    }
+};
+
+
+}
+
+template<>
+struct fmt::formatter<tw::net::NetworkResult> : fmt::formatter<std::string>
+{
+    auto format(tw::net::NetworkResult my, format_context &ctx) const -> decltype(ctx.out())
+    {
+        return formatter<string_view>::format(my.mesg(), ctx);
+    }
+};