ProtectionAreas (built-in)

[xoft]

Rather than pushing the entire table to Lua and back, it'd be better to wrap the array into an object, cBlockArray:

function OnExploding(World, ExplosionSize, CanCauseFire, X, Y, Z, Source, SourceData, AffectedBlocks)
    assert(tolua.type(AffectedBlocks) == "cBlockArray")  -- It is an object with its own operations

    -- Example: do NOT explode dirt:
    for n = AffectedBlocks.GetCount() - 1, 0, -1 do  -- count from GetCount() - 1 down to 0
        if (AffectedBlock:GetBlockType(n) == E_BLOCK_DIRT) then  -- Get the n-th block's type
            AffectedBlocks.Remove(n)
        end
    end
    return false
end