Add copy constructor for CURLWrapper.

The copy constructor does the same as the constructor. A new CURL handle is used
for the “copy”.

include/curl_wrapper.hpp

@@ -70,8 +70,12 @@ public:
      */
     CURLWrapper();
 
-    //! Copy constructor
-    CURLWrapper(const CURLWrapper &other) = delete;
+    /*!
+     *  @brief  Copy constructor. Does the same as the Constructor.
+     *
+     *  @since  0.5.2
+     */
+    CURLWrapper(const CURLWrapper &);
 
     //! Move constructor
     CURLWrapper(CURLWrapper &&other) noexcept = delete;
@@ -253,6 +257,13 @@ private:
     string _curl_buffer_body;
     bool _stream_cancelled;
 
+    /*!
+     *  @brief  Initializes curl and sets up connection.
+     *
+     *  @since  0.5.2
+     */
+    void init();
+
     /*!
      *  @brief  libcurl write callback function.
      *

src/curl_wrapper.cpp

@@ -41,9 +41,7 @@ using std::uint16_t;
 // No one will ever need more than 65535 connections. 😉
 static atomic<uint16_t> curlwrapper_instances{0};
 
-CURLWrapper::CURLWrapper()
-    : _curl_buffer_error{}
-    , _stream_cancelled{false}
+void CURLWrapper::init()
 {
     if (curlwrapper_instances == 0)
     {
@@ -55,6 +53,23 @@ CURLWrapper::CURLWrapper()
     _connection = curl_easy_init();
     setup_curl();
 }
+
+CURLWrapper::CURLWrapper()
+    : _connection{}
+    , _curl_buffer_error{}
+    , _stream_cancelled{false}
+{
+    init();
+}
+
+CURLWrapper::CURLWrapper(const CURLWrapper &)
+    : _connection{}
+    , _curl_buffer_error{}
+    , _stream_cancelled{false}
+{
+    init();
+}
+
 CURLWrapper::~CURLWrapper() noexcept
 {
     curl_easy_cleanup(_connection);