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using System.Runtime.CompilerServices;

namespace DuckDB.NET.Data.DataChunk;

// The validity mask of a vector: one bit per row, 1 for valid, in 64-bit entries. The DuckDB C API documents

// this layout for direct access. A vector has no mask until one of its rows is NULL, so callers check the

// pointer first.

internal static unsafe class ValidityMask

{

[MethodImpl(MethodImplOptions.AggressiveInlining)]

public static bool IsValid(ulong* mask, ulong row) => (mask[row / 64] & (1UL << (int)(row % 64))) != 0;

[MethodImpl(MethodImplOptions.AggressiveInlining)]

public static void SetValid(ulong* mask, ulong row) => mask[row / 64] |= 1UL << (int)(row % 64);

[MethodImpl(MethodImplOptions.AggressiveInlining)]

public static void SetInvalid(ulong* mask, ulong row) => mask[row / 64] &= ~(1UL << (int)(row % 64));

}