undef throw struct throw_dummy constexpr throw_dummy size_t line char

#undef throw
struct throw_dummy {
    constexpr throw_dummy(size_t line, char const *filename)
        : line {line}, filename {filename} {}

    size_t line;
    char const *filename;
};

template <typename E>
struct ExceptionWithInfo : public E {
    ExceptionWithInfo(size_t line, char const *filename, E &&e)
        : E { std::move(e) }, line {line}, filename {filename}
    {
        info = fmt::sprintf("%s:%d: %s: %s", filename, line, cxxDemangle(typeid(E).name()), E::what());
    }
    ~ExceptionWithInfo() final = default;

    virtual const char *what() const noexcept {
        return info.data();
    }

    size_t line;
    char const *filename;
    std::string info;
};

#define ____THROW_(LINE) ____zz_throw_dummy##LINE
#define ____THROW(LINE) ____THROW_(LINE)

template <class F>
[[noreturn]] inline void
operator*(throw_dummy &&d, F &&f) {
    throw ExceptionWithInfo<F>(d.line, d.filename, std::forward<F>(f));
}
#define throw throw_dummy{__LINE__, __FILENAME__} *