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  1. #include <cstdio>
  2. #include <iostream>
  3. #include <functional>
  4. using namespace std;
  5.  
  6. double qax(int a, long b) { return a * b; }
  7. double quux(int a, long b) { return a * b; }
  8. std::function<double(int, long)> gfred1 = qax; 
  9. std::function<double(int, long)> gfred0 = quux; 
  10.  
  11. int main() {
  12.   fprintf(stdout, "%d\n", gfred1.target<double(*)(int, long)>() == gfred0.target<double(*)(int, long)>());
  13.   fprintf(stdout, "%d\n", *gfred1.target<double(*)(int, long)>() == qax);
  14.   fprintf(stdout, "%d\n", *gfred0.target<double(*)(int, long)>() == qax);
  15.   fprintf(stdout, "%d\n", *gfred0.target<double(*)(int, long)>() == quux);
  16.   fprintf(stdout, "%d\n", *gfred1.target<double(*)(int, long)>() == quux);
  17.   fprintf(stdout, "%d\n", *gfred1.target<double(*)(int, long)>() != quux);
  18.   fprintf(stdout, "%d\n", *gfred1.target<double(*)(int, long)>() != qax);
  19.   fprintf(stdout, "%d\n", *gfred0.target<double(*)(int, long)>() != qax);
  20.   fprintf(stdout, "%d\n", *gfred0.target<double(*)(int, long)>() != quux);
  21.   return 0;
  22. }
Success #stdin #stdout 0.01s 5320KB
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https://ideone.com/70WOig
language:
C++14 (gcc 8.3)
created:
111 days ago
visibility:
secret

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