# for C++ programmers libcurl provides a C API. C and C++ are similar but not the same. There are a few things to keep in mind when using libcurl in C++. ## Strings are C strings, not C++ string objects When you pass strings to libcurl's APIs that accept `char *` that means you cannot pass in C++ strings or objects to those functions. For example, if you build a string with C++ and then want that string used as a URL: std::string url = "https://example.com/foo.asp?name=" + i; curl_easy_setopt(curl, CURLOPT_URL, url.c_str()); ## Callback considerations Since libcurl is a C library, it does not know anything about C++ member functions or objects. You can overcome this limitation with relative ease using for a static member function that is passed a pointer to the class. Here's an example of a write callback using a C++ method as callback: // f is the pointer to your object. static size_t YourClass::func(void *buffer, size_t sz, size_t n, void *f) { // Call non-static member function. static_cast<YourClass*>(f)->nonStaticFunction(); } // This is how you pass pointer to the static function: curl_easy_setopt(hcurl, CURLOPT_WRITEFUNCTION, YourClass::func); curl_easy_setopt(hcurl, CURLOPT_WRITEDATA, this);