Visual C++ .NET/Collections/count if

count_if and functor

<source lang="csharp">

1. include "stdafx.h"
2. include <cliext/vector>
3. include <cliext/functional>
4. include <cliext/algorithm>

using namespace System; using namespace cliext; using namespace System::Collections::Generic; ref class MyClass{ public:

   String^ Name;
   MyClass() : Name(String::Empty) { }
   MyClass(String^ name) : Name(name) { }
   MyClass(const MyClass% orig){
       Name = orig.Name; 
   }
   MyClass% operator=(const MyClass% orig){
       if (this != %orig)
           Name = orig.Name;
       return *this;
   }
   ~MyClass() { }
   bool operator<(const MyClass^ rhs){
       return (Name->CompareTo(rhs->Name) < 0);
   }    
   bool operator>(const MyClass^ rhs){
       return (Name->CompareTo(rhs->Name) > 0);
   }
   bool operator==(const MyClass^ rhs)
   {
       return (Name->Equals(rhs->Name));
   }

}; bool BeforeC(MyClass^ value){

   MyClass^ c = gcnew MyClass("C");
   return value > c;  

} int main(array<System::String ^> ^args) {

   vector<MyClass^> myCollection; 
   myCollection.push_back(gcnew MyClass("A")); 
   myCollection.push_back(gcnew MyClass("B"));
   myCollection.push_back(gcnew MyClass("C"));
   myCollection.push_back(gcnew MyClass("D"));
   for each (MyClass^ pet in myCollection) 
       Console::Write("{0} ", pet->Name);
   Console::Write("\n\ncount_if(F,L, BeforeC()) is:\n   ");
   Console::Write(count_if(myCollection.begin(), myCollection.end(), BeforeC).ToString());
   return 0;

}

 </source>