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  1. #include <iostream>
  2. #include <string>
  3. #include <sstream>
  4. #include <cassert>
  5.  
  6. int main()
  7. {
  8. 	{
  9.  
  10. 	    std::istringstream stream( "-5" );
  11. 	    unsigned int val = 0; 
  12. 	    // why is this allowed?
  13. 	    // -5 is not unsigned!
  14. 	    stream >> std::noskipws >> val;
  15. 	    bool success = stream.eof() && !stream.fail();
  16. 	    std::cout << success << ", val: " << val << std::endl;
  17. 	}
  18.  
  19.  
  20. 	{
  21. 	    // this still converts the value, but with fail
  22. 	    // you can detect the truncation
  23. 	    std::istringstream stream( "4294967291" );
  24. 	    int val = 0;
  25. 	    stream >> std::noskipws >> val;
  26. 	    bool success = stream.eof() && !stream.fail();
  27. 	    std::cout << success << ", val: " << val << std::endl;
  28. 	}
  29.  
  30.  
  31.     return 0;
  32. }
  33.  
Success #stdin #stdout 0s 15240KB
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stdin
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Standard input is empty
stdout
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1, val: 4294967291
0, val: 2147483647
https://ideone.com/krC3Ba
language:
C++14 (clang 8.0)
created:
8 years ago
visibility:
public

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