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using System;
using System.Runtime.InteropServices;
namespace PGFSharp
{
public class MetaVariableExpr : Expr {
internal MetaVariableExpr() {
_pool = new NativeGU.NativeMemoryPool();
IntPtr exprMetaPtr = NativeGU.gu_alloc_variant ((byte)PgfExprTag.PGF_EXPR_META,
(UIntPtr)Marshal.SizeOf <NativePgfExprMeta>(), UIntPtr.Zero, ref _ptr, _pool.Ptr);
Native.EditStruct<NativePgfExprMeta> (exprMetaPtr, (ref NativePgfExprMeta m) => m.Id = 0);
}
internal MetaVariableExpr(IntPtr ptr, NativeGU.NativeMemoryPool pool) : base(ptr, pool) { }
public int Id => Data.Id;
private NativePgfExprMeta Data => Marshal.PtrToStructure<NativePgfExprMeta>(DataPtr);
public override R Accept<R> (IVisitor<R> visitor)
{
// return visitor.VisitMetaVariable (Id);
// Not supported yet.
throw new NotImplementedException();
}
[StructLayout(LayoutKind.Sequential)]
private struct NativePgfExprMeta { public int Id; }
}
}
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