Solved: 08 - Switch Statements

Added a contract precondition to apply_operation

modules/02_control_flow/include/switch_statements.hpp

@@ -7,7 +7,9 @@ namespace control_flow {
 enum class Operation { Add, Subtract, Multiply, Divide, Unknown };
 
 [[nodiscard]] auto parse_operation(char op) -> Operation;
-[[nodiscard]] auto apply_operation(Operation op, int lhs, int rhs) -> int;
+// ReSharper disable once CppConstParameterInDeclaration
+[[nodiscard]] auto apply_operation(const Operation op, const int lhs, const int rhs) -> int
+    pre(op != Operation::Unknown);
 [[nodiscard]] auto day_name(int day) -> std::string;
 
 }  // namespace control_flow