When and why should you actually use noexcept in C++?

Hello colleagues! I've been writing in C++ for about a year, actively using C++11/14. I constantly see the `noexcept` keyword in code and libraries, but I don't fully understand when it should actually be used. For example, I'm writing a simple wrapper class for working with files. Here's how I usually define methods: ```cpp class FileWrapper { public: FileWrapper(const std::string& filename) : file_(fopen(filename.c_str(), "r")) { if (!file_) throw std::runtime_error("Cannot open file"); } ~FileWrapper() { if (file_) fclose(file_); } bool is_open() const { return file_ != nullptr; } std::string read_line() { // ... may throw an exception on read error } void close() { if (file_) { fclose(file_); fi