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template <class SourcePosition> struct get_col;
This is a lazy template metafunction.
Returns the column of a source position.
#include <boost/metaparse/get_col.hpp>
For any l
, c
compile-time wrapped integral values
and ch
compile-time wrapped
character the following are equivalent
get_col<source_position<l, c, ch>>::type c::type
#include <boost/metaparse/get_col.hpp> #include <boost/metaparse/source_position.hpp> #include <type_traits> using namespace boost::metaparse; struct returns_source_position { using type = source_position< std::integral_constant<int, 11>, std::integral_constant<int, 13>, std::integral_constant<char, 0> >; }; static_assert( get_col< source_position< std::integral_constant<int, 11>, std::integral_constant<int, 13>, std::integral_constant<char, 0> > >::type::value == 13, "It should return the column of a source position" ); static_assert( get_col<returns_source_position>::type::value == 13, "It should support lazy evaluation" );