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  1. #include <iostream>
  2. #include <random>
  3. #include <vector>
  4.  
  5.  
  6. int main() {
  7. 	std::random_device rd;
  8.     std::mt19937 gen(rd());
  9.     std::uniform_real_distribution<> dis(0,1);
  10.  
  11.     // Use fifty-fifty coin tosses to set some booleans.
  12.     // In actual code, these will be set by some condition.
  13. 	bool set_a = dis(gen) < 0.5;
  14.     bool success = dis(gen) < 0.5;
  15.     bool get_last = dis(gen) < 0.5;
  16.  
  17.     // Don't ever do this!
  18. 	int a = 0, b = 0;
  19. 	(set_a ? a : b) = 42;
  20.     std::cout << "a=" << a << "  b=" << b << '\n';
  21.  
  22.     // On the other hand, there's nothing at all wrong with this.
  23.     std::cout << "Status = " << (success ? "Success" : "Failure") << '\n';
  24.  
  25.     // There's nothing at all wrong with this, either.
  26.     std::vector<int> buffer(42);
  27.     int nlines = get_last ? 1 : buffer.size();
  28.     std::cout << "nlines = " << nlines << '\n';
  29.  
  30. }
Success #stdin #stdout 0s 3460KB
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stdin
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Standard input is empty
stdout
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a=42  b=0
Status = Success
nlines = 1
https://ideone.com/O7csXR
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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