69 lines
1.4 KiB
Plaintext
69 lines
1.4 KiB
Plaintext
[#get_position]
|
|
[section get_position]
|
|
|
|
[h1 Synopsis]
|
|
|
|
template <class D>
|
|
struct get_position;
|
|
|
|
This is a [link lazy_metafunction lazy template metafunction].
|
|
|
|
[table Arguments
|
|
[[Name] [Type]]
|
|
[[`D`] [[link accept accept] or [link reject reject] value]]
|
|
]
|
|
|
|
[h1 Description]
|
|
|
|
Returns the source position information of a parsing result.
|
|
|
|
[h1 Header]
|
|
|
|
#include <boost/metaparse/get_position.hpp>
|
|
|
|
[h1 Example]
|
|
|
|
#include <boost/metaparse/get_position.hpp>
|
|
#include <boost/metaparse/start.hpp>
|
|
#include <boost/metaparse/accept.hpp>
|
|
#include <boost/metaparse/reject.hpp>
|
|
#include <boost/metaparse/string.hpp>
|
|
#include <boost/metaparse/define_error.hpp>
|
|
|
|
#include <type_traits>
|
|
|
|
using namespace boost::metaparse;
|
|
|
|
BOOST_METAPARSE_DEFINE_ERROR(sample_error, "Sample error message");
|
|
|
|
struct returns_reject
|
|
{
|
|
using type = reject<sample_error, start>;
|
|
};
|
|
|
|
static_assert(
|
|
std::is_same<
|
|
start,
|
|
get_position<reject<sample_error, start>>::type
|
|
>::type::value,
|
|
"It should return the position of a reject"
|
|
);
|
|
|
|
static_assert(
|
|
std::is_same<
|
|
start,
|
|
get_position<
|
|
accept<sample_error, BOOST_METAPARSE_STRING("foo"), start>
|
|
>::type
|
|
>::type::value,
|
|
"It should return the position of an accept"
|
|
);
|
|
|
|
static_assert(
|
|
std::is_same<start, get_position<returns_reject>::type>::type::value,
|
|
"It should support lazy evaluation"
|
|
);
|
|
|
|
[endsect]
|
|
|