Просмотр исходного текста страницы Visual C++ .NET/Collections/count if

==count_if and functor==


   
<source lang="csharp"> 
#include "stdafx.h"
#include <cliext/vector>
#include <cliext/functional>
#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>