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## Function value

boost::proto::value — Return the value stored within the specified Proto terminal expression.

## Synopsis

    template<typename Expr>
      typename proto::result_of::value< Expr & >::type value(Expr & expr);
    template<typename Expr>
      typename proto::result_of::value< Expr const & >::type
      value(Expr const & expr);

## Description

Return the the value stored within the specified Proto terminal expression. The value is returned by reference.

Requires: | `0 == Expr::proto_arity::value`
Returns: | A reference to the terminal's value
Throws: | Will not throw.