Managed C++/CLI

mike toon wrote:

In unmanged code it seemed good enough to overload the type cast operators for this to happen but it appears that this is not the case in managed c++.

ref class numericstring
{
    String ^str;
public:
    numericstring()
    {
        str = gcnew String("123.456");
    }

    operator bool() {return Convert::ToDouble(str) != 0;}
    operator int() {return Convert::ToInt32(Convert::ToDouble(str));}
    operator double() {return Convert::ToDouble(str);}
};


[STAThreadAttribute]
int _tmain()
{
    numericstring ns;
    bool nsbool = ns;
    int nsint = ns;
    double nsdouble = ns;
...

ref class numericstring
{
    String ^str;
public:
    numericstring()
    {
        str = gcnew String("123.456");
    }

    static operator bool(numericstring^ val) {return Convert::ToDouble(val->str) != 0;}
    static operator int(numericstring^ val) {return Convert::ToInt32(Convert::ToDouble(val->str));}
    static operator double(numericstring^ val) {return Convert::ToDouble(val->str);}

};


[STAThreadAttribute]
int _tmain()
{
    numericstring ^ns = gcnew numericstring();
    bool nsbool = ns;
    int nsint = ns;
    double nsdouble = ns;
...

ref class numericstring
{
    String ^str;
public:
    numericstring()
    {
        str = gcnew String("123.456");
    }

    static explicit operator bool(numericstring^val) {return Convert::ToDouble(val->str) != 0;}
    static explicit operator int(numericstring^val) {return Convert::ToInt32(Convert::ToDouble(val->str));}
    static explicit operator double(numericstring^val) {return Convert::ToDouble(val->str);}

};


[STAThreadAttribute]
int _tmain()
{
    numericstring ^ns = gcnew numericstring();
    bool nsbool = (bool)ns;
    int nsint = (int)ns;
    double nsdouble = (double)ns;
...

Mark Salsbery
Microsoft MVP - Visual C++

mike toon wrote:

i'm baffled where the problem might be.

Mark Salsbery
Microsoft MVP - Visual C++

using namespace System;

ref class Value
	{
		public:

			enum struct ValType
			{
				Empty,
				Bool,
				Double,
				Integer
			};

			Value();

			Value^ operator=( Value^ rhs );
			
			Value( bool value );
	
			Value( double value );
				
			Value^ operator=( double doubVal );

			Value^ operator=( bool boolVal );

			template<typename t="">
			Value^ operator=( T value )
			{
				m_type   = ValType::Integer;
				m_value  = static_cast<int>( value );
				return this;
			}

			operator double( );

			operator bool( );
				
		private:

			Object^	m_value;
			ValType m_type;

	};</int></typename>

mike toon wrote:

Any clues as how I can provide the functionality to do the type casting implicitly with .net?

mike toon wrote:

I had been compiling a dll library in managed c++ which was to be used by c# code.

// In C++ DLL

using namespace System;

namespace TestCPlusPlusClassLibrary 
{

public ref class numericstring
{
    String ^str;
public:
    numericstring()
    {
        str = gcnew String("123.456");
    }

    static explicit operator bool(numericstring^ val) {return Convert::ToDouble(val->str) != 0;}
    static explicit operator int(numericstring^ val) {return Convert::ToInt32(Convert::ToDouble(val->str));}
    static explicit operator double(numericstring^ val) {return Convert::ToDouble(val->str);}
};

}

// In C#

...
    TestCPlusPlusClassLibrary.numericstring ns = new TestCPlusPlusClassLibrary.numericstring();
    bool nsbool = ns;
    int nsint = ns;
    double nsdouble = ns;
...

Mark Salsbery
Microsoft MVP - Visual C++

qt_oct wrote:

very urgent

auralius wrote:

Am I doing a good coding practice here

Mark Salsbery
Microsoft MVP - Visual C++

iman_kh wrote:

i want to create a property on my object

Mark Salsbery
Microsoft MVP - Visual C++

iman_kh wrote:

i want to create a property on my object

property System::IO::Ports::SerialPort^ SampleProperty
{
      System::IO::Ports::SerialPort^ get(){
	   // your code goes here
      }

      void set(System::IO::Ports::SerialPort^ port){
	   // your code
      }
};

property System::IO::Ports::SerialPort^ SampleProperty;