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struct space;
This is a parser.
space
accepts one white
space character. The result of parsing is the parsed character.
#include <boost/metaparse/space.hpp>
The followin are equivalent:
space accept_when<one_char, util::is_whitespace<>, errors::whitespace_expected>
#include <boost/metaparse/space.hpp> #include <boost/metaparse/start.hpp> #include <boost/metaparse/string.hpp> #include <boost/metaparse/is_error.hpp> #include <boost/metaparse/get_remaining.hpp> #include <type_traits> using namespace boost::metaparse; static_assert( std::is_same< BOOST_METAPARSE_STRING(" foo"), get_remaining<space::apply<BOOST_METAPARSE_STRING(" foo"), start>>::type >::type::value, "it should consume the first space of the input" ); static_assert( is_error<space::apply<BOOST_METAPARSE_STRING("x"), start>>::type::value, "it should return an error when the input does not begin with a whitespace" );