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libbulletml

Library of Bullet Markup Language (forked from https://shinh.skr.jp/libbulletml/index_en.html )git clone https://anongit.hacktivis.me/git/libbulletml.git/

formula.h (1680B)

    

  1. /// 数式クラス
  3. #ifndef FORMULA_H_
  4. #define FORMULA_H_
  6. #include "bulletmlcommon.h"
  8. template <typename Val_>
  9. class AbstractNumber {
  10. public:
  11. 	DECLSPEC virtual Val_ value() const =0;
  12. 	DECLSPEC virtual ~AbstractNumber() {}
  13. };
  15. template <typename Val_>
  16. class Number : public AbstractNumber<Val_> {
  17. public:
  18. 	DECLSPEC explicit Number(Val_ val) : val_(val) {}
  20. 	DECLSPEC virtual Val_ value() const { return val_; }
  22. private:
  23. 	Val_ val_;
  24. };
  26. typedef enum { op_null =0, op_add, op_sub, op_mul, op_div } Operator;
  28. template <typename Val_>
  29. class Formula : public AbstractNumber<Val_> {
  30. private:
  31. 	typedef AbstractNumber<Val_> ANumber;
  33. public:
  34. 	DECLSPEC virtual ~Formula() {
  35. 		delete lhs_;
  36. 		delete rhs_;
  37. 	}
  39. 	/// public だけど呼ばないで下さい。
  40. 	/**
  41. 	 * @todo yacc の使いかたを調べて、これを private に
  42. 	 */
  43. 	//@{
  44. 	DECLSPEC explicit Formula(ANumber* val)
  45. 		: lhs_(val), rhs_(0), op_(op_null), headsub_(false) {}
  46. 	DECLSPEC Formula(ANumber* lhs, Operator op, ANumber* rhs)
  47. 		: lhs_(lhs), rhs_(rhs), op_(op), headsub_(false) {}
  49. 	DECLSPEC Formula* setHeadSub() { headsub_ = true; return this; }
  50. 	//@}
  52. 	DECLSPEC virtual Val_ value() const {
  53. 		if (headsub_) return -valueBeforeHeadSub();
  54. 		else return valueBeforeHeadSub();
  55. 	}
  57. private:
  58. 	Val_ valueBeforeHeadSub() const {
  59. 		switch (op_) {
  60. 		case op_null:
  61. 			return lhs_->value();
  62. 		case op_add:
  63. 			return lhs_->value() + rhs_->value();
  64. 		case op_sub:
  65. 			return lhs_->value() - rhs_->value();
  66. 		case op_mul:
  67. 			return lhs_->value() * rhs_->value();
  68. 		case op_div:
  69. 			return lhs_->value() / rhs_->value();
  70. 		default:
  71. 			return 0;	// avoid warning
  72. 		}
  73. 	}
  75. private:
  76. 	ANumber *lhs_, *rhs_;
  77. 	Operator op_;
  78. 	bool headsub_;
  80. };
  82. #endif // ! FORMULA_H_