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  1. #include <boost/format.hpp>
  2. #include <iostream>
  3. #include <string>
  4.  
  5. int main()
  6. {
  7.     const std::string my_str = "echo '/%1%/ some other stuff'";
  8.     boost::format fmtr(my_str);
  9.     fmtr % "sleep 3";   // should read: echo '/sleep 3/ some other stuff'
  10.  
  11.     std::cout << "1: " << fmtr.str() << "\n";          // 1. echo '/sleep 3/ some other stuff'  (OK)
  12.     std::cout << "2: " << fmtr.str().c_str() << "\n";  // 2. echo '/sleep 3                     (BAD)
  13.  
  14.     // Try the c_str of a string not created through boost::format
  15.     const std::string finished = "echo '/sleep 3/ some other stuff'";
  16.     std::cout << "3: " << finished.c_str() << "\n";    // 3. echo '/sleep 3/ some other stuff'  (OK)
  17.  
  18.     // Try copying the string from format to see if that makes any difference (it doesn't)
  19.     std::string copy = fmtr.str();
  20.     std::cout << "4: " << copy.c_str() << "\n";        // 4. echo '/sleep 3                     (BAD)
  21. }
  22.  
Success #stdin #stdout 0s 3500KB
comments (?)
stdin
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Standard input is empty
stdout
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1: echo '/sleep 3/ some other stuff'
2: echo '/sleep 3/ some other stuff'
3: echo '/sleep 3/ some other stuff'
4: echo '/sleep 3/ some other stuff'
https://ideone.com/xVbxdO
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
public

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