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[.net] C++/CLI Implilcit conversion operator

Started by break_r Mar 15, 2005 at 10:54 PM 1 replies 850+ views

Original Post

Mar 15, 2005 at 10:54 PM

Hi, I have the following console app:


using namespace System;

class Foo
{
    double d;

public:
    Foo() : d( 3.14159 ) {  }

    operator double()
    {
        return d;
    }
};

int main()
{
    Foo f;
    double e = f;

    Console::WriteLine( e );  // outputs 3.14159 and everthing is good!
    Console::ReadLine();
}

Now when I change Foo to a managed type: ref class Foo { ... } and run the same program, I get 5.91378815174249E+276 Anyone know how implicit conversion operators should be implemented with the new C++/CLI syntax? Thx. [edit] Washu: The amazing [ source] and tags strike again! [Edited by - Washu on March 15, 2005 11:21:28 PM]

TheBluMage

Mar 16, 2005 at 2:07 AM

Simply changing the class to a managed class with the ref keyword left several compile issues that needed resolving for me. In managed classes the conversion operators are written differently. Change this:

operator double() { return d; }

To this:

static operator double(Foo^ foo) { return foo->d; }

And change this:

Foo f;

To this:

Foo^ f = gcnew Foo();

That worked as expected for me anyway.

break_r

Mar 16, 2005 at 8:12 PM

Thank you very much.

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