Struct array in struct

Question

Is it possible to declare struct array field in another struct?

[StructLayout(LayoutKind.Sequential, Pack = 1)]
public unsafe struct A
{
}

[StructLayout(LayoutKind.Sequential, Pack = 1)]
public unsafe struct B
{
    public fixed A FieldA[123];
}

Visual Studio tells that FieldA can only be an array of any simple type not a struct. Is there any solution/workaround here?

Jon Skeet · Accepted Answer · 2012-04-28 06:36:38Z

3

Is it possible to declare struct array field in another struct?

Yes, but there are restrictions if you want to make it a fixed-size buffer. From section 18.7.1 of the C# 4 spec:

The buffer element type of a fixed size buffer declaration specifies the element type of the buffer(s) introduced by the declaration. The buffer element type must be one of the predefined types sbyte, byte, short, ushort, int, uint, long, ulong, char, float, double, or bool.

I don't know of any alternatives to emulate fixed sized buffers of arbitrary structs.

answered Apr 28, 2012 at 6:36

Jon Skeet

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Comments

aleroot · Accepted Answer · 2012-04-28 06:41:22Z

0

Try defining the second struct in this way :

[StructLayout(LayoutKind.Sequential, Pack = 1)]
public unsafe struct B
{
    [MarshalAs(UnmanagedType.ByValArray, SizeConst=123)]
    public fixed A[] FieldA;
}

answered Apr 28, 2012 at 6:41

aleroot

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