Oh yes. It signifies a "tracking reference" - have a look on MSDN for
the details.

Dave

Hi,

I think "Ben Voigt [C++ MVP]" has explained the meaning of "%" in function
call. It means passing the CLR types by reference with tracking references.

Actually, there are 2 ways to return the result to the caller:
1. Through the return value.
2. Through the parameter by reference.(Using "%" in function parameter)

The code below demonstrates both 2 approaches:

void fnRef(String^% str)
{
    str =  str + "Whatever";
}

String ^ fn(String^ str)
{
    String ^ s = gcnew String( str + "Whatever" );
    return s;
}

int main(array<System::String ^> ^args)
{
    String ^ str="abc";
    String ^ result = fn(str);
               Console::WriteLine(result);

    fnRef(result);
               Console::WriteLine(result);
               return 0;
}

Please refer to the link below for several usage of "%" in C++/CLI:
http://msdn2.microsoft.com/en-us/library/8903062a(VS.80).aspx

Hope this helps.

Best regards,
Jeffrey Tan
Microsoft Online Community Support
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