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- [#lit_c]
- [section lit_c]
- [h1 Synopsis]
- template <char C>
- struct lit;
- This is a [link parser parser].
- [table Arguments
- [[Name] [Type]]
- [[`C`] [`char` value]]
- ]
- [h1 Description]
- Parser accepting only the `C` character. The result of parsing is the accepted
- character.
- [h1 Header]
- #include <boost/metaparse/lit_c.hpp>
- [h1 Expression semantics]
- For any `c` character the following are equivalent:
- lit_c<c>
-
- lit<boost::mpl::char_<c>>
- [h1 Example]
- #include <boost/metaparse/lit_c.hpp>
- #include <boost/metaparse/start.hpp>
- #include <boost/metaparse/string.hpp>
- #include <boost/metaparse/is_error.hpp>
- #include <boost/metaparse/get_result.hpp>
-
- using namespace boost::metaparse;
-
- static_assert(
- is_error<lit_c<'x'>::apply<BOOST_METAPARSE_STRING("a"), start>>::type::value,
- "a different character should be an error"
- );
-
- static_assert(
- is_error<lit_c<'x'>::apply<BOOST_METAPARSE_STRING(""), start>>::type::value,
- "empty input should be an error"
- );
-
- static_assert(
- get_result<
- lit_c<'x'>::apply<BOOST_METAPARSE_STRING("x"), start>
- >::type::value == 'x',
- "result of parsing should be the accepted character"
- );
- [endsect]
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