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  1. #include <iostream>
  2. #include <set>
  3. #include <string>
  4. #include <type_traits>
  5. using namespace std;
  6.  
  7. struct base 
  8. { 
  9.     struct compare 
  10.     {
  11.         template <typename T, std::enable_if_t<!std::is_base_of<base, T>::value, bool> = true>
  12.         bool operator()(const T& lhs, const base& rhs) const { return lhs < rhs.Name; }
  13.  
  14.         template <typename T, std::enable_if_t<!std::is_base_of<base, T>::value, bool> = true>
  15.         bool operator()(const base& lhs, const T& rhs) const { return lhs.Name < rhs; }
  16.  
  17.         bool operator()(const base& lhs, const base& rhs) const { return lhs.Name < rhs.Name; } 
  18.  
  19.         using is_transparent = int; 
  20.     }; 
  21.  
  22.     /*explicit base(const char * name) : Name(name) {} */
  23.     explicit base(std::string name) : Name(std::move(name)) {}
  24.  
  25.     virtual ~base() {};
  26.  
  27.     std::string Name;
  28. };
  29. /*
  30. base::~base()
  31. {
  32. }
  33. */
  34. struct derived : base
  35. { 
  36.         explicit derived(const std::string& name) 
  37.                 : base(name) 
  38.         { 
  39.         } 
  40. };
  41.  
  42. int main() 
  43. { 
  44.     std::set<derived, base::compare> baseset; 
  45.  
  46.     baseset.emplace("Test"); 
  47.  
  48.     auto x = baseset.find("Test"); 
  49.  
  50.     std::cout << (x != baseset.end() ? x->Name : "not found!") << std::endl;
  51.  
  52.     auto y = baseset.find(string("Test2"));
  53.  
  54.     std::cout << (y != baseset.end() ? y->Name : "not found!") << std::endl;
  55. }
  56.  
Success #stdin #stdout 0.01s 5424KB
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Standard input is empty
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Test
not found!
https://ideone.com/dAOBsU
language:
C++14 (gcc 8.3)
created:
1 year ago
visibility:
public

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