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  1. #include <utility>
  2. #include <iostream>
  3.  
  4. template<class T>
  5. T& assign(T& t1, const T& t2)
  6. {
  7.     void* ptr = &t1;
  8.     t1.~T();
  9.     return *new(ptr) T(t2);
  10. }
  11.  
  12. int main()
  13. {
  14.     int i = 0;
  15.     auto l1 = [=](int v) mutable { if(!i) i = v; std::cout << "\ni = " << i ; };
  16.     auto l2(l1);
  17.     l1(1);
  18.     l2(2);
  19.     std::cout << "\nassign:";
  20.     assign(l1, l2);
  21.     l1(1);
  22.     l2(2);
  23. }
  24.  
Success #stdin #stdout 0s 2928KB
comments (?)
stdin 
Standard input is empty
stdout 
i = 1
i = 2
assign:
i = 2
i = 2
https://ideone.com/GyEkHd
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
secret

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