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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. class Tensor
  5. {
  6. public:
  7. 	Tensor& setA() { cout << "A"; return *this; }
  8.     Tensor& setB() { cout << "B"; return *this; }
  9.     Tensor& setC() { cout << "C"; return *this; }
  10.     Tensor& setD() { cout << "D"; return *this; }
  11.     Tensor& setE() { cout << "E"; return *this; }
  12.     Tensor& noOp() { return *this; }
  13.     void build() { cout << endl; }
  14. };
  15.  
  16. void doTest(bool flag)
  17. {
  18. 	Tensor& (Tensor::*temp)() = flag ? &Tensor::setE : &Tensor::noOp;
  19.  
  20.     (Tensor{}
  21.     .setA()
  22.     .setB()
  23.     .setC()
  24.     .setD()
  25.     .*temp)()
  26.     .build();
  27. }
  28.  
  29. int main()
  30. {
  31. 	doTest(false);
  32. 	doTest(true);
  33. 	return 0;
  34. }
Success #stdin #stdout 0.01s 5444KB
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stdin
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Standard input is empty
stdout
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ABCD
ABCDE
https://ideone.com/iHfkes
language:
C++ (gcc 8.3)
created:
4 years ago
visibility:
public

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