Re: Assignment of native container types to generated types in C#

Let's track this in https://github.com/swig/swig/issues/2367.

William

On Mon, 12 Sept 2022 at 16:46, Mario Emmenlauer <[email protected]> wrote:

>
> Dear All,
>
> I've just started with SWIG and followed the documentation to build
> a few first examples. Everything works great!
>
> Now I have a question: I can not use directly the native C# type in
> a method signature that expects the generated type. Am I doing some-
> thing wrong, or is that expected? I'm not too knowledgeable with C#
> so I have a hard time understanding what is even missing - the
> assignment operator maybe?
>
> The native method expects a `const std::vector<std::string>&`. I name
> this `StringVector` in the interface.
>
> This code illustrates the problem in C#:
>     string[] cData = { "Hello", "World", "äöü", "ß 是" };
>     IList<string> vStringList = new List<string>(cData);
>
>     var vInteropTestNativeWrapper = new InteropTestNativeWrapper();
>
>     // This does not compile, with error:
>     // Argument 1: cannot convert from
> 'System.Collections.Generic.IList<string>' to 'StringVector'
> [InteropTestManaged]
>     //vInteropTestNativeWrapper.setStringVector(vStringList);
>
>     // This compiles and works, but is a bit more cumbersome:
>     vInteropTestNativeWrapper.setStringVector(new
> StringVector(vStringList));
>
>
> Is that to be expected, or is there some way in SWIG to use native
> types and generated types interchangeable?
>
> All the best,
>
>     Mario Emmenlauer
>
>
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