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Make use of C++17 std::optional<> instead of boost::optional<>.
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@@ -51,7 +51,7 @@ private:
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void simplify(std::vector<Statement>& _statements);
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bool expressionAlwaysTrue(Expression const& _expression);
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bool expressionAlwaysFalse(Expression const& _expression);
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boost::optional<dev::u256> hasLiteralValue(Expression const& _expression) const;
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std::optional<dev::u256> hasLiteralValue(Expression const& _expression) const;
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};
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}
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