Re: csconstvalue seems unusable

On Tue, 4 Feb 2020 at 18:24, Shawn Laptiste <[email protected]>
wrote:

> I'm in the process of revising the swig file that, in conjunction with
> some python scripts, takes care of transforming our C/C++ API into a C# API
> for our Unity users. Our API has a number of constants that are being
> specified using code similar to the following:
> %constant IntegerType InvalidId = unchecked((ulong)(-1));
> I have spent some time investigating %csconst and %csconstvalue, and I
> believe %csconstvalue is what I need, but I can't figure out why it keeps
> failing with the following console error:
> MyDrive:\ObscuredFolders\SwigFile.swig(11) : Error: Syntax error in
> input(1).
>
>
The following works for me:

%inline %{
typedef unsigned long long IntegerType;
%}

%{
unsigned long long unchecked(unsigned long long i) { return i; }
%}

%csconstvalue("unchecked((ulong)(-1))") InvalidId;
%constant IntegerType InvalidId = unchecked((ulong)(-1));

And generates C# code:

  public static readonly ulong InvalidId = unchecked((ulong)(-1));

I'm not sure why you have an 'unchecked' call in your %constant as then you
need a C++ function called unchecked. If you are getting syntax errors,
provide the exact input (with all macros expanded) for further help.

William

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