httprequest.cpp

class Http {
public:

    // omitted other code
    
	/**
	 * @param callback(CURLcode, response)
	 */
	template<typename F>
	void request(std::string url, F &callback) {
		curl_easy_reset(handle);
		curl_easy_setopt(handle, CURLOPT_WRITEDATA, &response);
		curl_easy_setopt(handle, CURLOPT_WRITEFUNCTION, &writeCallback);
		curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
		CURLcode res = curl_easy_perform(curl);
		callback(res, response);
	}

private:
	size_t writeCallback(void *contents, size_t size, size_t nmemb, std::string *data) {
		response.append((char*)contents, size * nmemb);
		return size * nmemb;
	}
private:
	CURL *handle;
	std::string response;
	static int curlInstanceCount;
};