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  1. #include <iostream>
  2.  
  3. template <typename R, typename P, typename = typename R::base_type>
  4. struct inherit_base_pattern : public virtual P { };
  5. template <typename R, typename P>
  6. struct inherit_base_pattern<R, P, R> { };
  7.  
  8. template <int I1, int I2>
  9. struct adder { typedef adder base_type; };
  10.  
  11. template <int I1, int I2>
  12. struct adder1 : public adder<I1, I2> { typedef adder<I1, I2> base_type; };
  13.  
  14. template <int I1, int I2>
  15. struct adder2 : public adder<I1, I2> { typedef adder<I1, I2> base_type; };
  16.  
  17. template <int I1, int I2>
  18. struct adder3 : public adder2<I1, I2> { typedef adder2<I1, I2> base_type; };
  19.  
  20. template <typename A, int I>
  21. struct fusedmultiplyadder
  22.    : public inherit_base_pattern< A, fusedmultiplyadder<typename A::base_type, I> >
  23. { typedef fusedmultiplyadder base_type; };
  24.  
  25. template <typename A, int I>
  26. struct fusedmultiplyadder1
  27.    : public virtual fusedmultiplyadder<A, I>,
  28.    public inherit_base_pattern< A, fusedmultiplyadder1<typename A::base_type, I> >
  29. { typedef fusedmultiplyadder<A, I> base_type; };
  30.  
  31. template <int i1, int i2, int i3>
  32. void foo(fusedmultiplyadder<adder<i1, i2>, i3>)
  33. {
  34.    std::cout << "fma: " << i1 << ", " << i2 << ", " << i3 << std::endl;
  35. }
  36.  
  37. int main()
  38. {
  39.    fusedmultiplyadder<adder1<2, 3>, 4> fma1;
  40.    foo(fma1);
  41.    fusedmultiplyadder<adder2<2, 3>, 4> fma2;
  42.    foo(fma2);
  43.    fusedmultiplyadder<adder3<2, 3>, 4> fma3;
  44.    foo(fma3);
  45.    fusedmultiplyadder1<adder2<2, 3>, 4> fma4;
  46.    foo(fma4);
  47.    fusedmultiplyadder1<adder3<2, 3>, 4> fma5;
  48.    foo(fma5);
  49.    return 0;
  50. }
Success #stdin #stdout 0s 2888KB
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stdin
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Standard input is empty
stdout
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fma: 2, 3, 4
fma: 2, 3, 4
fma: 2, 3, 4
fma: 2, 3, 4
fma: 2, 3, 4
https://ideone.com/q1FBz
language:
C++14 (gcc 8.3)
created:
13 years ago
visibility:
public

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