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  1. #include <iostream>
  2. #include <sstream>
  3. #include <string>
  4. #include <locale>
  5.  
  6. namespace mns
  7. {
  8.     template<class charT>
  9.     const charT* begin(const std::basic_string<charT>& s)
  10.     {
  11.         return &s.front();
  12.     }
  13.  
  14.     template<class charT>
  15.     const charT* end(const std::basic_string<charT>& s)
  16.     {
  17.         return &s[s.size()];
  18.     }
  19. }
  20.  
  21. std::istringstream diffusionTensorFile("No. activity levels :    3\nNo. pitch-angles    :   90\nNo. energies        :   11\nNo. L-shells        :   10");
  22.  
  23. int main()
  24. {
  25.     std::locale loc(diffusionTensorFile.getloc());
  26.     auto& f = std::use_facet<std::ctype<char>>(loc);
  27.     int alphaSize;
  28.     std::string sline;
  29.  
  30.     while (std::getline(diffusionTensorFile, sline))
  31.     {
  32.         const char* result;
  33.         if ((result = f.scan_is(f.digit, mns::begin(sline),
  34.                                          mns::end(sline))) != mns::end(sline))
  35.         {
  36.             alphaSize = atoi(result);
  37.             // do something with alphaSize
  38.             std::cout << alphaSize << std::endl;
  39.         }
  40.     }
  41. }
Success #stdin #stdout 0s 3472KB
comments (?)
stdin 
Standard input is empty
stdout 
3
90
11
10
https://ideone.com/a8qbBg
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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