Class isspace

backward.hpp:3737–3739

think of it like a lambda in C++98 ;) but look, I will reuse it two times! What a good boy am I.

    // but look, I will reuse it two times!
    // What a good boy am I.
    struct isspace {
      bool operator()(char c) { return std::isspace(c); }
    };

    bool started = false;
    for (; line_idx < line_start + line_count; ++line_idx) {