Struct _value

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## Struct _value

boost::proto::_value — A PrimitiveTransform that returns the value of the current terminal expression.

## Synopsis

    // In header: <boost/proto/transform/arg.hpp>

    struct _value :  proto::transform< _value > {
      // member classes/structs/unions
      template<typename Expr, typename State, typename Data>
      struct impl :  proto::transform_impl< Expr, State, Data > {
        // types
        typedef typename proto::result_of::value< Expr >::type result_type;

        // public member functions
        typename proto::result_of::value< Expr >::type
        operator()(typename impl::expr_param, typename impl::state_param,
                   typename impl::data_param) const;
      };
    };

## Description

Example:

    proto::terminal<int>::type i = {42};
    int j = proto::_value()(i);
    assert( 42 == j );