boost::yap::else_
// In header: <boost/yap/algorithm.hpp> template<typename Expr> decltype(auto) else_(Expr && expr);
Returns the else-expression in an if_else expression.
Equivalent to get(expr, 2_c).
get(expr, 2_c)
else_() is only valid if Expr is an expr_kind::if_else expression.
else_()
expr_kind::if_else