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  1. #include <iostream>
  2.  
  3. int add(int a, int b){ return a + b; }
  4. int add_f(float a, float b){ return a + b; }
  5.  
  6. union {
  7.     int (*f1)(int, int);
  8.     int (*f2)(float, float);
  9. } fp;
  10.  
  11. int main(void)
  12. {
  13.     fp.f1 = &add;
  14.     std::cout << "Expected (1): " << add(1, 3) << std::endl;
  15.     std::cout << "Actual   (1): " << (fp.f1)(1, 3) << std::endl;
  16.  
  17.     std::cout << "Expected (2): " << add(1.0f, 3.0f) << std::endl;
  18.     std::cout << "Actual   (2): " << (fp.f2)(1.0f, 3.0f) << std::endl;
  19.  
  20.     fp.f2 = &add_f;
  21.     std::cout << "Expected (3): " << add_f(1.0f, 3.0f) << std::endl;
  22.     std::cout << "Actual   (3): " << (fp.f2)(1.0f, 3.0f) << std::endl;
  23.  
  24.     std::cout << "Expected (4): " << add_f(1, 3) << std::endl;
  25.     std::cout << "Actual   (4): " << (fp.f1)(1, 3) << std::endl;
  26.  
  27.     return 0;
  28. }
Success #stdin #stdout 0.01s 2684KB
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stdin
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Standard input is empty
stdout
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Expected (1): 4
Actual   (1): 4
Expected (2): 4
Actual   (2): 2143289344
Expected (3): 4
Actual   (3): 4
Expected (4): 4
Actual   (4): 0
https://ideone.com/Z8Ryv
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

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