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  1. #include <stdio.h>
  2.  
  3. #define tempClassDef( num ) template<class T##num> struct tempClass##num       { T##num m##num; }; \
  4.                             template<>             struct tempClass##num<void> {  }
  5.  
  6. tempClassDef( 0 );
  7. tempClassDef( 1 );
  8. tempClassDef( 2 );
  9.  
  10. template<class T0, class T1=void, class T2=void>
  11. struct MyTupple : tempClass0<T0>, tempClass1<T1>, tempClass2<T2>
  12. {
  13. public:
  14. };
  15.  
  16. class A
  17. {
  18. public:
  19. 	int m_Value;
  20. 	A() : m_Value(0) { printf( "A\n" ); }
  21. 	~A(){ printf( "~A\n" ); }
  22. };
  23.  
  24. class B
  25. {
  26. public:
  27. 	int m_Value;
  28. 	B() : m_Value(1) { printf( "B\n" ); }
  29. 	~B(){ printf( "~B\n" ); }
  30. };
  31.  
  32. class C
  33. {
  34. public:
  35. 	int m_Value;
  36. 	C() : m_Value(2) { printf( "C\n" ); }
  37. 	~C(){ printf( "~C\n" ); }
  38. };
  39.  
  40. int main( void )
  41. {
  42. 	{
  43. 		printf( "sizeof( MyTupple<A,B,C> ) = %d\n", sizeof(MyTupple<A,B,C>) );
  44. 		MyTupple<A,B,C> myTupple;
  45. 		printf( "%d, %d, %d\n", myTupple.m0.m_Value, myTupple.m1.m_Value, myTupple.m2.m_Value );
  46. 	}
  47. 	{
  48. 		printf( "sizeof( MyTupple<C> ) = %d\n", sizeof(MyTupple<C>) );
  49. 		MyTupple<C> myTupple;
  50. 		printf( "%d\n", myTupple.m0.m_Value );
  51. 	}
  52.     return 0;
  53. }
Success #stdin #stdout 0s 3340KB
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stdin
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Standard input is empty
stdout
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sizeof( MyTupple<A,B,C> ) = 12
A
B
C
0, 1, 2
~C
~B
~A
sizeof( MyTupple<C> ) = 4
C
2
~C
https://ideone.com/FWKkVv
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
secret

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