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  1. #include <iostream>
  2. #include <ios>
  3. #include <bitset>
  4. using std::cout;
  5. using std::endl;
  6. using std::bitset;
  7. using std::ios;
  8. typedef std::ios_base::fmtflags flags_t;
  9. void printFlags(const char* msg) {
  10.     flags_t flags = cout.flags();
  11.     bitset<sizeof(flags) * 8> bset(flags);
  12.     cout << msg << " : " << bset << endl;
  13. }
  14. int main() {
  15.     printFlags("before      ");
  16.     cout.setf(ios::hex, ios::basefield);
  17.     printFlags("after setf  ");
  18.     cout.unsetf(ios::hex);
  19.     printFlags("after unsetf");
  20. }
Success #stdin #stdout 0s 3032KB
comments (?)
stdin
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Standard input is empty
stdout
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before       : 00000000000000000001000000000010
after setf   : 00000000000000000001000000001000
after unsetf : 00000000000000000001000000000000
https://ideone.com/fYXyh6
undefined behavior?
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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