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  1. // setfill example
  2. #include <iostream>     // std::cout, std::endl
  3. #include <iomanip>      // std::setfill, std::setw
  4.  
  5. class IosFlagSaver {
  6. public:
  7.     explicit IosFlagSaver(std::ostream& _ios):
  8.         ios(_ios),
  9.         f(_ios.flags()) {
  10.     }
  11.     ~IosFlagSaver() {
  12.         ios.flags(f);
  13.     }
  14.  
  15.     IosFlagSaver(const IosFlagSaver &rhs) = delete;
  16.     IosFlagSaver& operator= (const IosFlagSaver& rhs) = delete;
  17.  
  18. private:
  19.     std::ostream& ios;
  20.     std::ios::fmtflags f;
  21. };
  22.  
  23.  
  24. int main1 () {
  25.  
  26. IosFlagSaver iosfs(std::cout);
  27.  
  28. using std::cout;
  29. using std::setw;
  30.  
  31.  
  32.  
  33. cout << std::left <<
  34.    setw(10) << "12345," <<
  35.    setw(12) << "abcdefghik," << 
  36.    setw(3) << "ABC" << "\n";
  37.  
  38.   return 0;
  39. }
  40.  
  41. int main2 () {
  42.  
  43. IosFlagSaver iosfs(std::cout);
  44.  
  45. using std::cout;
  46. using std::setw;
  47.  
  48. cout << std::left << 
  49.    setw(10) << "12345," <<
  50.    setw(12) << "abcdefghik," << 
  51.    setw(3) << "ABC" << "\n";
  52.  
  53.   return 0;
  54. }
  55.  
  56. int main () {
  57.  
  58. using std::cout;
  59. using std::setw;
  60.  
  61.   // os_r.fill(' ');
  62.   // os_r.width(0);
  63.  
  64.  
  65. cout << "Calling main1" << std::endl;
  66. main1();
  67.  
  68. cout << "Calling main2" << std::endl;
  69. main2();
  70.  
  71.    return 0;
  72. }
Success #stdin #stdout 0s 3468KB
comments (?)
stdin
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Standard input is empty
stdout
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Calling main1
12345,    abcdefghik, ABC
Calling main2
12345,    abcdefghik, ABC
https://ideone.com/EwJWqI
language:
C++14 (clang 8.0)
created:
7 years ago
visibility:
public

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