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  1. #include <locale>
  2. #include <iostream>
  3.  
  4. using namespace std;
  5.  
  6.  
  7. /// collate<char> colc;
  8.  
  9.  
  10. template<typename C>
  11. class My_collate : public collate<C>
  12. {
  13. public:
  14.     explicit My_collate(size_t r = 0) :
  15.         collate<C> {r}
  16.     {
  17.     }
  18. };
  19.  
  20. My_collate<char> mcolc;
  21.  
  22.  
  23. void print(const string& s1, const string& s2,
  24.            const int& rslt)
  25. {
  26.     string srslt {};
  27.  
  28.     switch(rslt)
  29.     {
  30.     case 0:
  31.         srslt = "equal";
  32.         break;
  33.  
  34.     case 1:
  35.         srslt = "s1 > s2";
  36.         break;
  37.  
  38.  
  39.     case -1:
  40.         srslt = "s1 < s2";
  41.         break;
  42.     }
  43.  
  44.     cout << "comparison of " << s1 << " and " << s2
  45.          << " using the mcolc facet : "
  46.          << srslt << endl;
  47. }
  48.  
  49.  
  50. void test(const string& s1, const string& s2)
  51. {
  52.     /// since compare() operates on char[]s
  53.     const char* s1b = s1.data();        /// start of data
  54.     const char* s1e = s1b + s1.size();  /// end of data
  55.     const char* s2b = s2.data();        /// start of data
  56.     const char* s2e = s2b + s2.size();  /// end of data
  57.  
  58.     int rslt = mcolc.compare(s1b, s1e, s2b, s2e);
  59.  
  60.     /// display results
  61.     print(s1, s2, rslt);
  62. }
  63.  
  64.  
  65. int main()
  66. {
  67.     test("Hello", "Hello");
  68.     test("Hello", "hello");
  69.     test("hello", "Hello");
  70. }
  71.  
Success #stdin #stdout 0s 4532KB
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stdin
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Standard input is empty
stdout
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comparison of Hello and Hello using the mcolc facet : equal
comparison of Hello and hello using the mcolc facet : s1 < s2
comparison of hello and Hello using the mcolc facet : s1 > s2
https://ideone.com/D6zrbr
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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