#ifndef STORM_STORAGE_EXPRESSIONS_UNARYEXPRESSION_H_
#define STORM_STORAGE_EXPRESSIONS_UNARYEXPRESSION_H_

#include "storm/storage/expressions/BaseExpression.h"
#include "storm/utility/OsDetection.h"

namespace storm {
    namespace expressions {
        class UnaryExpression : public BaseExpression {
        public:
            /*!
             * Creates a unary expression with the given return type and operand.
             *
             * @param manager The manager responsible for this expression.
             * @param type The return type of the expression.
             * @param operand The operand of the unary expression.
             */
            UnaryExpression(ExpressionManager const& manager, Type const& type, std::shared_ptr<BaseExpression const> const& operand);

            // Instantiate constructors and assignments with their default implementations.
            UnaryExpression(UnaryExpression const& other) = default;
            UnaryExpression& operator=(UnaryExpression const& other) = delete;
            UnaryExpression(UnaryExpression&&) = default;
            UnaryExpression& operator=(UnaryExpression&&) = delete;
            virtual ~UnaryExpression() = default;
            
            // Override base class methods.
            virtual bool isFunctionApplication() const override;
            virtual bool containsVariables() const override;
            virtual uint_fast64_t getArity() const override;
            virtual std::shared_ptr<BaseExpression const> getOperand(uint_fast64_t operandIndex) const override;
            virtual void gatherVariables(std::set<storm::expressions::Variable>& variables) const override;
            
            /*!
             * Retrieves the operand of the unary expression.
             *
             * @return The operand of the unary expression.
             */
            std::shared_ptr<BaseExpression const> const& getOperand() const;
            
        private:
            // The operand of the unary expression.
            std::shared_ptr<BaseExpression const> operand;
        };
    }
}

#endif /* STORM_STORAGE_EXPRESSIONS_UNARYEXPRESSION_H_ */