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  1. #include <iostream>
  2. #include <sstream>
  3.  
  4. size_t size_of_stream(const std::stringstream& ss)
  5. {
  6.     std::streambuf* buf = ss.rdbuf();
  7.  
  8. 	const auto original = buf->pubseekoff( 0, ss.cur, ss.out );
  9. 	const auto end = buf->pubseekoff( 0, ss.end, ss.out );
  10. 	buf->pubseekpos( original, ss.out );
  11.  
  12. 	return (size_t)end;
  13. }
  14.  
  15. int main()
  16. {
  17.     std::stringstream ss1;
  18.     ss1 << "Hello";
  19.     std::cout << size_of_stream(ss1) << " " << ss1.str().size() << std::endl;
  20.  
  21.     std::stringstream ss2("World");
  22.     std::cout << size_of_stream(ss2) << " " << ss2.str().size() << std::endl;
  23.  
  24.     std::stringstream ss3("");
  25.     std::cout << size_of_stream(ss3) << " " << ss3.str().size() << std::endl;
  26.  
  27.     std::stringstream ss4;
  28.     std::cout << size_of_stream(ss4) << " " << ss4.str().size() << std::endl;
  29.  
  30.     std::stringstream ss5;
  31.     ss5 << "";
  32.     std::cout << size_of_stream(ss5) << " " << ss5.str().size() << std::endl;
  33.  
  34.     std::stringstream ss6( "hello world" );
  35.     std::cout << size_of_stream(ss6) << " " << ss6.str().size() << std::endl;
  36.     std::string temp;
  37.     ss6 >> temp;
  38.     std::cout << size_of_stream(ss6) << " " << ss6.str().size() << std::endl;
  39. }
Success #stdin #stdout 0.01s 5304KB
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stdin
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Standard input is empty
stdout
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5 5
5 5
0 0
0 0
0 0
11 11
11 11
https://ideone.com/U1j8GG
language:
C++14 (gcc 8.3)
created:
3 days ago
visibility:
public

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