Function template assert

Function template assert_matches

boost::proto::assert_matches — Assert at compile time that a particular expression matches the specified grammar.

// In header: <boost/proto/debug.hpp>


template<typename Grammar, typename Expr> 
  void assert_matches(Expr const & expr);

Use proto::assert_matches() to assert at compile-time that an expression matches a grammar.

Example:

typedef proto::plus< proto::terminal< int >, proto::terminal< int > > PlusInts;

proto::assert_matches<PlusInts>( proto::lit(1) + 42 );