Struct template placeholder

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## Struct template placeholder

boost::xpressive::placeholder

## Synopsis

    template<typename T, int I, typename Dummy>
    struct placeholder {
      // types
      typedef placeholder< T, I, Dummy > this_type;
      typedef unspecified                action_arg_type;
    };

## Description

placeholder<T>, for defining a placeholder to stand in fo a variable of type T in a semantic action.