C++ (Cpp) range::drop Examples

Example #1

File: named.cpp Project: rogiervd/parse_ll

template <class Parser> void check_repeat_a (Parser const & parser) {
    using range::empty; using range::first; using range::drop;
    {
        std::string r ("aa");
        auto result = parse (parser, r);
        BOOST_CHECK (success (result));
        auto o = output (result);
        BOOST_CHECK (!empty (o));
        BOOST_CHECK (!empty (drop (o)));
        BOOST_CHECK (empty (drop (drop (o))));
        BOOST_CHECK_EQUAL (first (o), 'a');
        BOOST_CHECK_EQUAL (first (drop (o)), 'a');
        BOOST_CHECK (empty (rest (result)));
    }
    {
        std::string r ("ab");
        auto result = parse (parser, r);
        BOOST_CHECK (success (result));
        auto o = output (result);
        BOOST_CHECK (!empty (o));
        BOOST_CHECK (empty (drop (o)));
        BOOST_CHECK_EQUAL (first (o), 'a');
        BOOST_CHECK_EQUAL (first (rest (result)), 'b');
    }
    {
        std::string r ("b");
        auto result = parse (parser, r);
        BOOST_CHECK (success (result));
        auto o = output (result);
        BOOST_CHECK (empty (o));
        BOOST_CHECK_EQUAL (first (rest (result)), 'b');
    }
}