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  1. #include <iostream>
  2. #include <string>
  3. #include <sstream>
  4.  
  5. template < typename T > std::string to_string( const T& value )
  6. {
  7.     std::ostringstream os ;
  8.     os << value ;
  9.     return os.str() ;
  10. }
  11.  
  12. template < typename T > T to_value( const std::string& str )
  13. {
  14.     std::istringstream is(str) ;
  15.     T value ;
  16.     if( is >> value >> std::ws && is.eof() ) // success
  17.         return value ;
  18.     else // failed
  19.        // report error (throw something)
  20.        return T() ;
  21. }
  22.  
  23. int main()
  24. {
  25.      int i = 12345 ;
  26.      std::string str = to_string(i) ;
  27.      int j = to_value<int>(str) ;
  28.      std::cout << "i: " << i << " str: " << str << " j: " << j << '\n' ;
  29.  
  30.      double d = 123.45 ;
  31.      str = to_string(d) ;
  32.      double e = to_value<double>(str) ;
  33.      std::cout << "d: " << d << " str: " << str << " e: " << e << '\n' ;
  34. }
  35.  
Success #stdin #stdout 0s 3036KB
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stdin
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Standard input is empty
stdout
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i: 12345 str: 12345 j: 12345
d: 123.45 str: 123.45 e: 123.45
https://ideone.com/FUzMOy
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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