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  1. #include <iostream>
  2.  
  3. template <typename T1, typename T2>
  4. struct gattai2{
  5.     T1 a;
  6.     T2 b;
  7.     decltype(b(a())) operator ()() { return b(a()); }
  8. };
  9.  
  10. template <typename T>
  11. struct gattai1{
  12.     T a;
  13.     decltype(a()) operator ()() { return a(); }
  14.  
  15.     template <typename T2>
  16.     friend gattai2<T, T2> operator +(const gattai1<T> &g, const T2 &b){
  17.         return {g.a, b};
  18.     }
  19. };
  20.  
  21. struct gattai{
  22.     template <typename T>
  23.     friend gattai1<T> operator +(const gattai &g, const T &a){
  24.             return {a};
  25.     }
  26. };
  27.  
  28. int main(){
  29.     auto atama = [](){ return 1; };
  30.     auto mune = [](int i){ return "tekitou"; };
  31.     auto robo = gattai() + atama + mune;
  32.     std::cout << robo() << std::endl;
  33. }
Success #stdin #stdout 0s 2852KB
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stdin 
Standard input is empty
stdout 
tekitou
https://ideone.com/agSW9t
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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