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  1. #include <iostream>
  2. #include <locale>
  3. #include <string>
  4. #include <sstream>
  5. #include <algorithm>
  6. #include <iterator>
  7. #include <cstring>
  8.  
  9. std::string extract_ints(std::ctype_base::mask category, std::string str, std::ctype<char> const& facet)
  10. {
  11.     using std::strlen;
  12.  
  13.     char const *begin = &str.front(),
  14.                *end   = &str.back();
  15.  
  16.     auto res = facet.scan_is(category, begin, end);
  17.  
  18.     begin = &res[0];
  19.     end   = &res[strlen(res)];
  20.  
  21.     return std::string(begin, end);
  22. }
  23.  
  24. std::string extract_ints(std::string str)
  25. {
  26.     return extract_ints(std::ctype_base::digit, str,
  27.          std::use_facet<std::ctype<char>>(std::locale("")));
  28. }
  29.  
  30. int main()
  31. {
  32.     int a, b, c;
  33.  
  34.     std::string str = "abc 1 2 3";
  35.     std::stringstream ss(extract_ints(str));
  36.  
  37.     ss >> a >> b >> c;
  38.  
  39.     std::cout << a << '\n' << b << '\n' << c;
  40. }
Success #stdin #stdout 0s 4516KB
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https://ideone.com/NWcOvv
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
secret

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