c++/cx passing value struct by reference

Question

"If you have a value type as a function or method parameter, it is normally passed by value. For larger objects, this can cause a performance problem. In Visual Studio2013 and earlier, value types in C++/CX were always passed by value. In Visual Studio 2015 and later, you can pass value types by reference or by value."

That did not work for me, using value_struct& in a function signature had the compiler issue the:

Error C3987 'Set': signature of public member contains native type value_struct&... Works without the reference, Visual Studio 2015

What am I missing?

nmr · Accepted Answer · 2016-02-03 03:15:24Z

I was able to get this to work like this:

public interface class MyDelegate { void MyDelegateMethod(Platform::String^ str, Windows::Foundation::Point *point); }

.. and in the C# delegate implementation:

public void MyDelegateMethod(string str, out Point p) { ... }

It's mentioned in the MS page on this stuff (https://msdn.microsoft.com/en-us/library/hh699861.aspx):

You can also use a pointer symbol (*) to pass a value type by reference. The behavior with respect to callers in other languages is the same (callers in C# use the ref keyword), but in the method, the type is a pointer to the value type.

Collectives™ on Stack Overflow

c++/cx passing value struct by reference

1 Answer 1

Comments

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Related