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  1. #include <iostream>
  2. #include <map>
  3. #include <stack>
  4. #include <string>
  5.  
  6. #define _USE_MATH_DEFINES
  7. #include <cmath>
  8.  
  9. #define NUMBERS(X) \
  10. 	X(Zero, 0.0)	X(One, 1.0)		X(Two, 2.0)		X(Three, 3.0)	\
  11. 	X(Four, 4.0)	X(Five, 5.0)	X(Six, 6.0)		X(Seven, 7.0)	\
  12. 	X(Eight, 8.0)	X(Nine, 9.0)	X(Ten, 10.0)	X(Eleven, 11)	\
  13. 	X(Pi, M_PI)
  14.  
  15. #define OPERATIONS(X) X(Add, +) X(Sub, -) X(Mul, *) X(Div, /)
  16.  
  17. #define VARIABLES(X) X(x) X(y) X(z)
  18.  
  19. std::map<std::string, double> variables;
  20. std::stack<double> stack;
  21.  
  22. struct Top {
  23. 	Top(double& x) {
  24. 		x = stack.top();
  25. 	}
  26. };
  27.  
  28. struct Pop {
  29. 	Pop(double& x) {
  30. 		delete new Top(x);
  31. 		stack.pop();
  32. 	}
  33. };
  34.  
  35. struct Push {
  36. 	Push (double x){
  37. 		stack.push(x);
  38. 	}
  39. };
  40.  
  41. struct Number {
  42. 	Number (double v) {
  43. 		delete new Push(v);
  44. 	}
  45. };
  46.  
  47. #define NUMBER_CLASS(Name, value) \
  48. struct Name {                     \
  49. 	Name () {                     \
  50. 		delete new Number(value); \
  51. 	}                             \
  52. };
  53.  
  54. NUMBERS(NUMBER_CLASS)
  55.  
  56. #define OPERATION_CLASS(Name, X) \
  57. struct Name {                    \
  58. 	Name () {                    \
  59. 		double x, y;             \
  60. 		delete new Pop(y);       \
  61. 		delete new Pop(x);       \
  62. 		delete new Push(x X y);  \
  63. 	}                            \
  64. };
  65.  
  66. OPERATIONS(OPERATION_CLASS)
  67.  
  68. struct VarSet {
  69. 	VarSet(const std::string& name) {
  70. 		double x;
  71. 		delete new Pop(x);
  72. 		variables[name] = x;
  73. 	}
  74. };
  75.  
  76. struct VarGet {
  77. 	VarGet(const std::string& name) {
  78. 		delete new Push(variables[name]);
  79. 	}
  80. };
  81.  
  82. #define VARIABLE_DEFINE_CLASS(Name) \
  83. struct set ## Name {                \
  84. 	set ## Name () {                \
  85. 		delete new VarSet(#Name);   \
  86. 	}                               \
  87. };
  88.  
  89. #define VARIABLE_GET_CLASS(Name)   \
  90. struct Name {                      \
  91. 	Name () {                      \
  92. 		delete new VarGet(#Name);  \
  93. 	}                              \
  94. };
  95.  
  96. VARIABLES(VARIABLE_DEFINE_CLASS)
  97. VARIABLES(VARIABLE_GET_CLASS)
  98.  
  99. struct Print {
  100. 	template<typename n> Print (n x) {
  101. 		std::cout << x << std::endl;
  102. 	}
  103. 	Print () {
  104. 		double x;
  105. 		delete new Top(x);
  106. 		std::cout << x << std::endl;
  107. 	}
  108. };
  109.  
  110. int main() {
  111.  
  112. 	delete new Pi;
  113. 	delete new One;
  114. 	delete new Two;
  115. 	delete new Add;
  116. 	delete new Div;
  117. 	delete new Print("PI/3:");
  118. 	delete new Print;
  119. 	delete new setx;
  120.  
  121. 	delete new One;
  122. 	delete new One;
  123. 	delete new One;
  124. 	delete new Add;
  125. 	delete new Add;
  126. 	delete new x;
  127. 	delete new Mul;
  128. 	delete new Print("PI:");
  129. 	delete new Print;
  130.  
  131. 	return 0;
  132. }
Success #stdin #stdout 0s 3488KB
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PI/3:
1.0472
PI:
3.14159
https://ideone.com/11jE3T
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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