Visual C++ .NET/Language Basics/gcnew

Assign new value to dereferenced int

 
#include "stdafx.h"
using namespace System;
void main()
{
    int ^y = gcnew int(100);  
    *y = 110;                 
    Console::WriteLine(*y);   
}

Create a handle to an int

 
#include "stdafx.h"
using namespace System;
void main()
{
    int ^y = gcnew int(100);  // create a handle to an int
    Console::WriteLine(y);    // print out int.
}

generic gcnew

 
#include "stdafx.h"
using namespace System;
generic <typename T> where T: gcnew()
T CreateInstance()
{
   return gcnew T();
}
ref class MyClass
{
   public:
   MyClass() { }
};
int main()
{
   int i = CreateInstance<int>();
   MyClass^ r = CreateInstance<MyClass^>();
}

Using gcnew

 
#include "stdafx.h"
using namespace System;
ref class ParentClass{
public:
    ParentClass() : PVal(10) {}
    ParentClass(int inVal) : PVal(inVal) {}
    ParentClass(const ParentClass %p) : PVal(p.PVal) {}
    int PVal;
};
ref class ChildClass : public ParentClass{
public:
    ChildClass () : CVal(20) {};    
    ChildClass (int inVal1, int inVal2) : ParentClass(inVal1), CVal(inVal2) {}
    ChildClass(const ChildClass %vals) : ParentClass(vals.PVal), CVal(vals.CVal) {}
    int CVal;
};
void main()
{
    ChildClass ^c1 = gcnew ChildClass(5,6); // Constructor
    ChildClass  c2 = *c1;                   // Copy Constructor
    c1->CVal = 12;        // Change original, new unchanged
    Console::WriteLine("c1=[{0}/{1}] c2=[{2}/{3}]", 
        c1->PVal, c1->CVal, c2.PVal, c2.CVal);
}