Method FileStream

src/catch2/internal/catch_istream.cpp:76–80

            std::ofstream m_ofs;
        public:
            FileStream( std::string const& filename ) {
                m_ofs.open( filename.c_str() );
                CATCH_ENFORCE( !m_ofs.fail(), "Unable to open file: '" << filename << '\'' );
                m_ofs << std::unitbuf;
            }
        public: // IStream
            std::ostream& stream() override {
                return m_ofs;