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boost::proto::left — Return the left child of the specified binary Proto expression.
// In header: <boost/proto/traits.hpp> template<typename Expr> typename proto::result_of::left< Expr & >::type left(Expr & expr); template<typename Expr> typename proto::result_of::left< Expr const & >::type left(Expr const & expr);
Return the left child of the specified binary Proto expression. The child is returned by reference.
| Requires: | 
             
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| Returns: | A reference to the left child of  | 
| Throws: | Will not throw. |