+ small optimization - pass and return const ref
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@ -47,7 +47,7 @@ struct evaluate : boost::static_visitor<T1>
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explicit evaluate(feature_type const& f)
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explicit evaluate(feature_type const& f)
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: feature_(f) {}
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: feature_(f) {}
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value_type operator() (value_type x) const
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value_type const& operator() (value_type const& x) const
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{
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{
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return x;
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return x;
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}
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}
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