refactored into a proper RAII class for a curl handle

requester.cpp

@@ -30,6 +30,28 @@ requester::requester() {
     curl_easy_setopt(_h, CURLOPT_WRITEFUNCTION, write_data);
 }
 
+requester::~requester() {
+    if (_h) {
+        curl_easy_cleanup(_h);
+    }
+}
+
+requester::requester(requester&& other) {
+    _h = other._h;
+    other._h = nullptr;
+}
+
+requester& requester::operator=(requester &&other) {
+    if (this != &other) {
+        if (_h) {
+            curl_easy_cleanup(_h);
+        }
+        _h = other._h;
+        other._h = nullptr;
+    }
+    return *this;
+}
+
 std::string requester::get(const std::string &url) {
     curl_easy_setopt(_h, CURLOPT_URL, url.c_str());
     std::vector<char> buf;

requester.hpp

@@ -14,14 +14,27 @@
 
 class requester {
     public:
+        // callback for data receiving
         static size_t write_data(char* buf, size_t sz, size_t nmemb, void* user_data);
 
+        // this class is a RAII class for a curl handle
         requester();
 
+        // forbid copying
+        requester(const requester& other) = delete;
+        requester& operator=(const requester& other) = delete;
+
+        // allow moving
+        requester(requester&& other);
+        requester& operator=(requester&& other);
+
+        // cleanup
+        ~requester();
+        
         std::string get(const std::string& url);
 
     private:
-        CURL* _h;
+        CURL* _h; // curl handle
 };
 
 #endif // _requester_H_