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  1. #include <iostream>
  2. #include <functional>
  3.  
  4. // Manual function definitions.
  5.     std::function<double(double)> plus2(double a){
  6.         return[a](double b){return a + b; };
  7.     }
  8.  
  9.     auto plus3(double a) {
  10.         return [a](double b){ return plus2(a + b); };
  11.     }
  12.  
  13. // -----
  14.  
  15. // Automatic function definitions.
  16.     template<int N>
  17.     auto plus(double a);
  18.  
  19.     template<int N>
  20.     auto plus(double a) {
  21.         return [a](double b){ return plus<N - 1>(a + b); };
  22.     }
  23.  
  24.     template<>
  25.     auto plus<1>(double a) {
  26.         return a;
  27.     }
  28.  
  29. // -----
  30.  
  31. int main() {
  32. 	std::cout << "Manual:\n"
  33. 			  << plus2(1)(2)    << ' '
  34. 			  << plus3(1)(2)(3) << '\n'
  35. 			  << "\nTemplate:\n"
  36. 			  << plus<2>(1)(2)          << ' '
  37. 			  << plus<3>(1)(2)(3)       << ' '
  38. 			  << plus<4>(1)(2)(3)(4)    << ' '
  39. 			  << plus<5>(1)(2)(3)(4)(5) << '\n';
  40. }
Success #stdin #stdout 0s 16064KB
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stdin
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Standard input is empty
stdout
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Manual:
3 6

Template:
3 6 10 15
https://ideone.com/Lvnz55
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
secret

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