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  1.  
  2. #include <vector>
  3. #include <algorithm>
  4. #include <iostream>
  5. #include <cctype>
  6. #include <string>
  7.  
  8. struct Comp{
  9.  
  10.     auto get_num (const std::string& a)
  11.     {
  12.         auto it1 = std::find_if( a.begin(), a.end(), ::isdigit );
  13.         auto it2 = std::find_if( a.begin(), a.end(), [](char x){ return x == '.' ;}) ;
  14.         /* Do some checks here for std::string::npos*/
  15.         auto pos1 = std::distance(  a.begin(), it1) ;
  16.         auto pos2 = std::distance(  it1, it2) ;
  17.         return std::stoi (a.substr( pos1, pos2 )) ;
  18.     }
  19.  
  20.     bool operator () (const std::string& a, const std::string& b)  
  21.     {
  22.         return  get_num (a) < get_num (b) ;
  23.     }
  24.  
  25. };
  26.  
  27.  
  28. int main ()
  29. {
  30.  
  31.     std::vector <std::string> vec {
  32.     "some_name_10.xyz",
  33.     "some_name_1.xyz",
  34.     "some_name_2.xyz",
  35.     "some_name_12.xyz",
  36.     "some_name_3.xyz"
  37.     };
  38.  
  39.    std::sort( vec.begin() , vec.end(), Comp());
  40.  
  41.    for(auto x: vec)
  42. 	 std::cout << x << std::endl;
  43.  
  44. }
Success #stdin #stdout 0s 3452KB
comments (?)
stdin 
Standard input is empty
stdout 
some_name_1.xyz
some_name_2.xyz
some_name_3.xyz
some_name_10.xyz
some_name_12.xyz
https://ideone.com/4FnXrp
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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