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## Struct template deep_copy

boost::proto::result_of::deep_copy — A metafunction for calculating the return type of `proto::deep_copy()`.

## Synopsis

    template<typename Expr>
    struct deep_copy {
      // types
      typedef unspecified type;
    };

## Description

A metafunction for calculating the return type of `proto::deep_copy()`. The type parameter `Expr` should be the type of a Proto expression tree. It should not be a reference type, nor should it be cv-qualified.