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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> proto::result_of::left< ( expr); template<typename Expr> proto::result_of::left< ( 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. |