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  1. #include <iostream>
  2. #include <string>
  3. using namespace std;
  4.  
  5. template <typename StrType, typename EnumType>
  6. class ExampleClass 
  7. {};
  8.  
  9. template <typename StrType, typename EnumType>
  10. void fooSingleCase()
  11. {
  12. 	std::cout << "In: " << __PRETTY_FUNCTION__ << "\n"; 
  13. 	ExampleClass<StrType, EnumType> instance;
  14. 	// ...
  15. }
  16.  
  17. template <typename StrType>
  18. struct StrTraits
  19. {
  20. 	static const std::string pattern;
  21. };
  22.  
  23. enum class ENUM1
  24. {
  25. 	VAL1,
  26. 	VAL2,
  27. 	VAL3,
  28. 	VAL4
  29. };
  30.  
  31. template <typename EnumType>
  32. struct ENUM1Traits
  33. {
  34. 	static const ENUM1 pattern;
  35. };
  36.  
  37. class VAL1TYPE {};
  38. class VAL2TYPE {};
  39. class VAL3TYPE {};
  40.  
  41. class STR1TYPE {};
  42. class STR2TYPE {};
  43.  
  44. template <>
  45. const std::string StrTraits<STR1TYPE>::pattern = "str1";
  46. template <>
  47. const std::string StrTraits<STR2TYPE>::pattern = "str2";
  48.  
  49. template <>
  50. const ENUM1 ENUM1Traits<VAL1TYPE>::pattern = ENUM1::VAL1;
  51. template <>
  52. const ENUM1 ENUM1Traits<VAL2TYPE>::pattern = ENUM1::VAL2;
  53. template <>
  54. const ENUM1 ENUM1Traits<VAL3TYPE>::pattern = ENUM1::VAL3;
  55.  
  56. template <typename EnumType>
  57. void fooFixedEnumCase(std::string strVal)
  58. {
  59. 	std::cout << strVal << " not found!\n";
  60. }
  61.  
  62. template <typename EnumType, typename Str1Type, typename ...StrType>
  63. void fooFixedEnumCase(std::string strVal)
  64. {
  65. 	if (StrTraits<Str1Type>::pattern == strVal)
  66. 		fooSingleCase<EnumType, Str1Type>();
  67. 	else
  68. 		fooFixedEnumCase<EnumType, StrType...>(strVal);
  69. }
  70.  
  71. template <typename ...EnumType>
  72. struct Enum1Switch;
  73.  
  74. template <typename EnumType1, typename ...EnumType>
  75. struct Enum1Switch<EnumType1, EnumType...>
  76. {
  77.     template <typename ...StrType>
  78. 	static void strSwitch(std::string str, ENUM1 enumVal)
  79. 	{
  80. 		if (ENUM1Traits<EnumType1>::pattern == enumVal)
  81. 			fooFixedEnumCase<EnumType1, StrType...>(str);
  82. 		else
  83. 			Enum1Switch<EnumType...>::template strSwitch<StrType...>(str, enumVal);
  84. 	}
  85. };
  86.  
  87. template <>
  88. struct Enum1Switch<>
  89. {
  90.     template <typename ...StrType>
  91. 	static void strSwitch(std::string str, ENUM1 enumVal)
  92. 	{
  93. 		std::cout << static_cast<int>(enumVal) << " not found!\n";
  94. 	}
  95. };
  96.  
  97. void foo(std::string str, ENUM1 enumVal) {
  98.  
  99. 	Enum1Switch<VAL1TYPE, VAL2TYPE, VAL3TYPE>
  100. 		::strSwitch<STR1TYPE, STR2TYPE>(str, enumVal);
  101. }
  102.  
  103. int main() {
  104. 	foo("str2", ENUM1::VAL3);
  105.  
  106. 	foo("str1", ENUM1::VAL1);
  107.  
  108. 	foo("str4", ENUM1::VAL1);
  109.  
  110. 	foo("str2", ENUM1::VAL4);
  111. }
Success #stdin #stdout 0s 3464KB
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Standard input is empty
stdout
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In: void fooSingleCase() [with StrType = VAL3TYPE; EnumType = STR2TYPE]
In: void fooSingleCase() [with StrType = VAL1TYPE; EnumType = STR1TYPE]
str4 not found!
3 not found!
https://ideone.com/O9ZRPz
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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