Description

Эквивалентно:

BOOST_PROTO_BASIC_EXTENDS(Expr, Derived, Domain)
BOOST_PROTO_EXTENDS_ASSIGN()
BOOST_PROTO_EXTENDS_SUBSCRIPT()
BOOST_PROTO_EXTENDS_FUNCTION()

Если параметр<Domain>зависим, вы можете указать его как<typename Domain>, как в<BOOST_PROTO_EXTENDS(Expr, Derived, typename Domain)>.

Пример:

template< class Expr >
struct my_expr;
struct my_domain
  : proto::domain< proto::pod_generator< my_expr > >
{};
template< class Expr >
struct my_expr
{
    // OK, this makes my_expr<> a valid Proto expression extension.
    // my_expr<> has overloaded assignment, subscript,
    // and function call operators that build expression templates.
    BOOST_PROTO_EXTENDS(Expr, my_expr, my_domain)
};
// OK, my_expr<> is POD, so this is statically initialized:
my_expr< proto::terminal<int>::type > const _1 = {{1}};