Performance Increase of Vector of Structures using .NET BlockCopy (#4830)

* Added Get<vector_name>Array() method for accessing vectors of structures in C# using Buffer.Blockcopy().

* Added Get<vector_name>Array() method for accessing vectors of structures in C# using Buffer.Blockcopy().

Added Create<Name>VectorBlock() method to add a typed array using Buffer.BlockCopy() to speed up creation of vector of arrays

New Lua files for namespace test

* fixed c++ style issue

net/FlatBuffers/ByteBuffer.cs

@@ -30,6 +30,7 @@
 //
 
 using System;
+using System.Collections.Generic;
 using System.IO;
 using System.Text;
 
@@ -91,19 +92,78 @@ namespace FlatBuffers
 
         public byte[] ToArray(int pos, int len)
         {
-            byte[] arr = new byte[len];
-            Buffer.BlockCopy(_buffer, pos, arr, 0, len);
+            return ToArray<byte>(pos, len);
+        }
+
+        /// <summary>
+        /// A lookup of type sizes. Used instead of Marshal.SizeOf() which has additional
+        /// overhead, but also is compatible with generic functions for simplified code.
+        /// </summary>
+        private static Dictionary<Type, int> genericSizes = new Dictionary<Type, int>()
+        {
+            { typeof(bool),     sizeof(bool) },
+            { typeof(float),    sizeof(float) },
+            { typeof(double),   sizeof(double) },
+            { typeof(sbyte),    sizeof(sbyte) },
+            { typeof(byte),     sizeof(byte) },
+            { typeof(short),    sizeof(short) },
+            { typeof(ushort),   sizeof(ushort) },
+            { typeof(int),      sizeof(int) },
+            { typeof(uint),     sizeof(uint) },
+            { typeof(ulong),    sizeof(ulong) },
+            { typeof(long),     sizeof(long) },
+        };
+
+        /// <summary>
+        /// Get the wire-size (in bytes) of a type supported by flatbuffers.
+        /// </summary>
+        /// <param name="t">The type to get the wire size of</param>
+        /// <returns></returns>
+        public static int SizeOf<T>()
+        {
+            return genericSizes[typeof(T)];
+        }
+
+        /// <summary>
+        /// Checks if the Type provided is supported as scalar value
+        /// </summary>
+        /// <typeparam name="T">The Type to check</typeparam>
+        /// <returns>True if the type is a scalar type that is supported, falsed otherwise</returns>
+        public static bool IsSupportedType<T>()
+        {
+            return genericSizes.ContainsKey(typeof(T));
+        }
+
+        /// <summary>
+        /// Get the wire-size (in bytes) of an typed array
+        /// </summary>
+        /// <typeparam name="T">The type of the array</typeparam>
+        /// <param name="x">The array to get the size of</param>
+        /// <returns>The number of bytes the array takes on wire</returns>
+        public static int ArraySize<T>(T[] x)
+        {
+            return SizeOf<T>() * x.Length;
+        }
+
+        // Get a portion of the buffer casted into an array of type T, given
+        // the buffer position and length.
+        public T[] ToArray<T>(int pos, int len)
+            where T: struct
+        {
+            AssertOffsetAndLength(pos, len);
+            T[] arr = new T[len];
+            Buffer.BlockCopy(_buffer, pos, arr, 0, ArraySize(arr));
             return arr;
         }
 
         public byte[] ToSizedArray()
         {
-            return ToArray(Position, Length - Position);
+            return ToArray<byte>(Position, Length - Position);
         }
 
         public byte[] ToFullArray()
         {
-            return ToArray(0, Length);
+            return ToArray<byte>(0, Length);
         }
 
         public ArraySegment<byte> ToArraySegment(int pos, int len)
@@ -368,6 +428,56 @@ namespace FlatBuffers
             WriteLittleEndian(offset, sizeof(double), ulonghelper[0]);
         }
 
+        /// <summary>
+        /// Copies an array of type T into this buffer, ending at the given
+        /// offset into this buffer. The starting offset is calculated based on the length
+        /// of the array and is the value returned.
+        /// </summary>
+        /// <typeparam name="T">The type of the input data (must be a struct)</typeparam>
+        /// <param name="offset">The offset into this buffer where the copy will end</param>
+        /// <param name="x">The array to copy data from</param>
+        /// <returns>The 'start' location of this buffer now, after the copy completed</returns>
+        public int Put<T>(int offset, T[] x)
+            where T : struct
+        {
+            if(x == null)
+            {
+                throw new ArgumentNullException("Cannot put a null array");
+            }
+
+            if(x.Length == 0)
+            {
+                throw new ArgumentException("Cannot put an empty array");
+            }
+
+            if(!IsSupportedType<T>())
+            {
+                throw new ArgumentException("Cannot put an array of type "
+                    + typeof(T) + " into this buffer");
+            }
+
+            if (BitConverter.IsLittleEndian)
+            {
+                int numBytes = ByteBuffer.ArraySize(x);
+                offset -= numBytes;
+                AssertOffsetAndLength(offset, numBytes);
+                // if we are LE, just do a block copy
+                Buffer.BlockCopy(x, 0, _buffer, offset, numBytes);
+            }
+            else
+            {
+                throw new NotImplementedException("Big Endian Support not implemented yet " +
+                    "for putting typed arrays");
+                // if we are BE, we have to swap each element by itself
+                //for(int i = x.Length - 1; i >= 0; i--)
+                //{
+                //  todo: low priority, but need to genericize the Put<T>() functions
+                //}
+            }
+            return offset;
+        }
+
+
 #endif // UNSAFE_BYTEBUFFER
 
         public sbyte GetSbyte(int index)

net/FlatBuffers/FlatBufferBuilder.cs

@@ -179,6 +179,18 @@ namespace FlatBuffers
             _bb.PutFloat(_space -= sizeof(float), x);
         }
 
+        /// <summary>
+        /// Puts an array of type T into this builder at the 
+        /// current offset
+        /// </summary>
+        /// <typeparam name="T">The type of the input data </typeparam>
+        /// <param name="x">The array to copy data from</param>
+        public void Put<T>(T[] x)
+            where T : struct
+        {
+            _space = _bb.Put(_space, x);
+        }
+
         public void PutDouble(double x)
         {
             _bb.PutDouble(_space -= sizeof(double), x);
@@ -245,6 +257,37 @@ namespace FlatBuffers
         /// <param name="x">The `float` to add to the buffer.</param>
         public void AddFloat(float x) { Prep(sizeof(float), 0); PutFloat(x); }
 
+        /// <summary>
+        /// Add an array of type T to the buffer (aligns the data and grows if necessary).
+        /// </summary>
+        /// <typeparam name="T">The type of the input data</typeparam>
+        /// <param name="x">The array to copy data from</param>
+        public void Add<T>(T[] x)
+            where T : struct
+        {
+            if (x == null)
+            {
+                throw new ArgumentNullException("Cannot add a null array");
+            }
+
+            if( x.Length == 0)
+            {
+                // don't do anything if the array is empty
+                return;
+            }
+
+            if(!ByteBuffer.IsSupportedType<T>())
+            {
+                throw new ArgumentException("Cannot add this Type array to the builder");
+            }
+
+            int size = ByteBuffer.SizeOf<T>();
+            // Need to prep on size (for data alignment) and then we pass the
+            // rest of the length (minus 1) as additional bytes
+            Prep(size, size * (x.Length - 1));
+            Put(x);
+        }
+
         /// <summary>
         /// Add a `double` to the buffer (aligns the data and grows if necessary).
         /// </summary>

net/FlatBuffers/Table.cs

@@ -94,6 +94,29 @@ namespace FlatBuffers
             return bb.ToArraySegment(pos, len);
         }
 
+        // Get the data of a vector whoses offset is stored at "offset" in this object as an
+        // T[]. If the vector is not present in the ByteBuffer, then a null value will be
+        // returned.
+        public T[] __vector_as_array<T>(int offset)
+            where T : struct
+        {
+            if(!BitConverter.IsLittleEndian)
+            {
+                throw new NotSupportedException("Getting typed arrays on a Big Endian " +
+                    "system is not support");
+            }
+
+            var o = this.__offset(offset);
+            if (0 == o)
+            {
+                return null;
+            }
+
+            var pos = this.__vector(o);
+            var len = this.__vector_len(o);
+            return bb.ToArray<T>(pos, len);
+        }
+
         // Initialize any Table-derived type to point to the union at the given offset.
         public T __union<T>(int offset) where T : struct, IFlatbufferObject
         {

src/idl_gen_general.cpp

@@ -1102,6 +1102,18 @@ class GeneralGenerator : public BaseGenerator {
             code += lang_.accessor_prefix + "__vector_as_arraysegment(";
             code += NumToString(field.value.offset);
             code += "); }\n";
+
+            // For direct blockcopying the data into a typed array
+            code += "  public ";
+            code += GenTypeBasic(field.value.type.VectorType());
+            code += "[] Get";
+            code += MakeCamel(field.name, lang_.first_camel_upper);
+            code += "Array() { return ";
+            code += lang_.accessor_prefix + "__vector_as_array<";
+            code += GenTypeBasic(field.value.type.VectorType());
+            code += ">(";
+            code += NumToString(field.value.offset);
+            code += "); }\n";
             break;
           default: break;
         }
@@ -1324,6 +1336,19 @@ class GeneralGenerator : public BaseGenerator {
               code += ".Value";
             code += "); return ";
             code += "builder." + FunctionStart('E') + "ndVector(); }\n";
+            // For C#, include a block copy method signature.
+            if (lang_.language == IDLOptions::kCSharp) {
+              code += "  public static " + GenVectorOffsetType() + " ";
+              code += FunctionStart('C') + "reate";
+              code += MakeCamel(field.name);
+              code += "VectorBlock(FlatBufferBuilder builder, ";
+              code += GenTypeBasic(vector_type) + "[] data) ";
+              code += "{ builder." + FunctionStart('S') + "tartVector(";
+              code += NumToString(elem_size);
+              code += ", data." + FunctionStart('L') + "ength, ";
+              code += NumToString(alignment);
+              code += "); builder.Add(data); return builder.EndVector(); }\n";
+            }
           }
           // Generate a method to start a vector, data to be added manually
           // after.

tests/FlatBuffers.Test/ByteBufferTests.cs

@@ -100,7 +100,7 @@ namespace FlatBuffers.Test
             Assert.AreEqual(0x0A, buffer[3]);
         }
 
- #if !BYTEBUFFER_NO_BOUNDS_CHECK
+#if !BYTEBUFFER_NO_BOUNDS_CHECK
         [FlatBuffersTestMethod]
         public void ByteBuffer_PutIntCannotPutAtOffsetPastLength()
         {
@@ -178,7 +178,7 @@ namespace FlatBuffers.Test
         public void ByteBuffer_GetByteChecksOffset()
         {
             var uut = new ByteBuffer(1);
-            Assert.Throws<ArgumentOutOfRangeException>(()=>uut.Get(1));
+            Assert.Throws<ArgumentOutOfRangeException>(() => uut.Get(1));
         }
 #endif
 
@@ -344,5 +344,269 @@ namespace FlatBuffers.Test
             uut.Position = 1; uut = uut.Duplicate();
             Assert.AreEqual(0x0A, uut.Get(3));
         }
+
+        [FlatBuffersTestMethod]
+        public void ByteBuffer_To_Array_Float()
+        {
+            const int len = 9;
+
+            // Construct the data array
+            var fData = new float[len];
+            fData[0] = 1.0079F;
+            fData[1] = 4.0026F;
+            fData[2] = 6.941F;
+            fData[3] = 9.0122F;
+            fData[4] = 10.811F;
+            fData[5] = 12.0107F;
+            fData[6] = 14.0067F;
+            fData[7] = 15.9994F;
+            fData[8] = 18.9984F;
+
+            // Tranfer it to a byte array
+            var buffer = new byte[sizeof(float) * fData.Length];
+            Buffer.BlockCopy(fData, 0, buffer, 0, buffer.Length);
+
+            // Create the Byte Buffer from byte array
+            var uut = new ByteBuffer(buffer);
+
+            // Get the full array back out and ensure they are equivalent
+            var bbArray = uut.ToArray<float>(0, len);
+            Assert.ArrayEqual(fData, bbArray);
+
+            // Get a portion of the full array back out and ensure the
+            // subrange agrees
+            var bbArray2 = uut.ToArray<float>(4, len - 1);
+            Assert.AreEqual(bbArray2.Length, len - 1);
+            for (int i = 1; i < len - 1; i++)
+            {
+                Assert.AreEqual(fData[i], bbArray2[i - 1]);
+            }
+
+            // Get a sub portion of the full array back out and ensure the
+            // subrange agrees
+            var bbArray3 = uut.ToArray<float>(8, len - 4);
+            Assert.AreEqual(bbArray3.Length, len - 4);
+            for (int i = 2; i < len - 4; i++)
+            {
+                Assert.AreEqual(fData[i], bbArray3[i - 2]);
+            }
+        }
+
+        public void ByteBuffer_Put_Array_Helper<T>(T[] data, int typeSize)
+            where T : struct
+        {
+            // Create the Byte Buffer
+            var uut = new ByteBuffer(1024);
+
+            // Put the data into the buffer and make sure the offset is
+            // calculated correctly
+            int nOffset = uut.Put(1024, data);
+            Assert.AreEqual(1024 - typeSize * data.Length, nOffset);
+
+            // Get the full array back out and ensure they are equivalent
+            var bbArray = uut.ToArray<T>(nOffset, data.Length);
+            Assert.ArrayEqual(data, bbArray);
+        }
+
+        [FlatBuffersTestMethod]
+        public void ByteBuffer_Put_Array_Float()
+        {
+            const int len = 9;
+
+            // Construct the data array
+            var data = new float[len];
+            data[0] = 1.0079F;
+            data[1] = 4.0026F;
+            data[2] = 6.941F;
+            data[3] = 9.0122F;
+            data[4] = 10.811F;
+            data[5] = 12.0107F;
+            data[6] = 14.0067F;
+            data[7] = 15.9994F;
+            data[8] = 18.9984F;
+
+            ByteBuffer_Put_Array_Helper(data, sizeof(float));
+        }
+
+        [FlatBuffersTestMethod]
+        public void ByteBuffer_Put_Array_Double()
+        {
+            const int len = 9;
+
+            // Construct the data array
+            var data = new double[len];
+            data[0] = 1.0079;
+            data[1] = 4.0026;
+            data[2] = 6.941;
+            data[3] = 9.0122;
+            data[4] = 10.811;
+            data[5] = 12.0107;
+            data[6] = 14.0067;
+            data[7] = 15.9994;
+            data[8] = 18.9984;
+
+            ByteBuffer_Put_Array_Helper(data, sizeof(double));
+        }
+
+        [FlatBuffersTestMethod]
+        public void ByteBuffer_Put_Array_Int()
+        {
+            const int len = 9;
+
+            // Construct the data array
+            var data = new int[len];
+            data[0] = 1;
+            data[1] = 4;
+            data[2] = 6;
+            data[3] = 9;
+            data[4] = 10;
+            data[5] = 12;
+            data[6] = 14;
+            data[7] = 15;
+            data[8] = 18;
+
+            ByteBuffer_Put_Array_Helper(data, sizeof(int));
+        }
+
+
+        [FlatBuffersTestMethod]
+        public void ByteBuffer_Put_Array_UInt()
+        {
+            const int len = 9;
+
+            // Construct the data array
+            var data = new uint[len];
+            data[0] = 1;
+            data[1] = 4;
+            data[2] = 6;
+            data[3] = 9;
+            data[4] = 10;
+            data[5] = 12;
+            data[6] = 14;
+            data[7] = 15;
+            data[8] = 18;
+
+            ByteBuffer_Put_Array_Helper(data, sizeof(uint));
+        }
+
+        [FlatBuffersTestMethod]
+        public void ByteBuffer_Put_Array_Bool()
+        {
+            const int len = 9;
+
+            // Construct the data array
+            var data = new bool[len];
+            data[0] = true;
+            data[1] = true;
+            data[2] = false;
+            data[3] = true;
+            data[4] = false;
+            data[5] = true;
+            data[6] = true;
+            data[7] = true;
+            data[8] = false;
+
+            ByteBuffer_Put_Array_Helper(data, sizeof(bool));
+        }
+
+        [FlatBuffersTestMethod]
+        public void ByteBuffer_Put_Array_Long()
+        {
+            const int len = 9;
+
+            // Construct the data array
+            var data = new long[len];
+            data[0] = 1;
+            data[1] = 4;
+            data[2] = 6;
+            data[3] = 9;
+            data[4] = 10;
+            data[5] = 12;
+            data[6] = 14;
+            data[7] = 15;
+            data[8] = 18;
+
+            ByteBuffer_Put_Array_Helper(data, sizeof(long));
+        }
+
+        [FlatBuffersTestMethod]
+        public void ByteBuffer_Put_Array_Byte()
+        {
+            const int len = 9;
+
+            // Construct the data array
+            var data = new byte[len];
+            data[0] = 1;
+            data[1] = 4;
+            data[2] = 6;
+            data[3] = 9;
+            data[4] = 10;
+            data[5] = 12;
+            data[6] = 14;
+            data[7] = 15;
+            data[8] = 18;
+
+            ByteBuffer_Put_Array_Helper(data, sizeof(byte));
+        }
+
+        [FlatBuffersTestMethod]
+        public void ByteBuffer_Put_Array_SByte()
+        {
+            const int len = 9;
+
+            // Construct the data array
+            var data = new sbyte[len];
+            data[0] = 1;
+            data[1] = 4;
+            data[2] = 6;
+            data[3] = 9;
+            data[4] = 10;
+            data[5] = 12;
+            data[6] = 14;
+            data[7] = 15;
+            data[8] = 18;
+
+            ByteBuffer_Put_Array_Helper(data, sizeof(sbyte));
+        }
+
+        [FlatBuffersTestMethod]
+        public void ByteBuffer_Put_Array_Null_Throws()
+        {
+            // Create the Byte Buffer
+            var uut = new ByteBuffer(1024);
+
+            // create a null array and try to put it into the buffer
+            float[] data = null;
+            Assert.Throws<ArgumentNullException>(() => uut.Put(1024, data));
+        }
+
+        [FlatBuffersTestMethod]
+        public void ByteBuffer_Put_Array_Empty_Throws()
+        {
+            // Create the Byte Buffer
+            var uut = new ByteBuffer(1024);
+
+            // create an array of length == 0, and try to put it into the buffer
+            float[] data = new float[0];
+            Assert.Throws<ArgumentException>(() => uut.Put(1024, data));
+        }
+
+        private struct dummyStruct
+        {
+            int a;
+            float b;
+        }
+
+        [FlatBuffersTestMethod]
+        public void ByteBuffer_Put_Array_IncorrectType_Throws()
+        {
+            // Create the Byte Buffer
+            var uut = new ByteBuffer(1024);
+
+            // Create an array of dummy structures that shouldn't be
+            // able to be put into the buffer
+            var data = new dummyStruct[10];
+            Assert.Throws<ArgumentException>(() => uut.Put(1024, data));
+        }
     }
 }

tests/FlatBuffers.Test/FlatBufferBuilderTests.cs

@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+using System;
+
 namespace FlatBuffers.Test
 {
     [FlatBuffersTestClass]
@@ -245,5 +247,108 @@ namespace FlatBuffers.Test
             var endOffset = fbb.Offset;
             Assert.AreEqual(endOffset, storedOffset);
         }
+
+        [FlatBuffersTestMethod]
+        public void FlatBufferBuilder_Add_Array_Float()
+        {
+            var fbb = CreateBuffer(false);
+            var storedOffset = fbb.Offset;
+
+            const int len = 9;
+
+            // Construct the data array
+            var data = new float[len];
+            data[0] = 1.0079F;
+            data[1] = 4.0026F;
+            data[2] = 6.941F;
+            data[3] = 9.0122F;
+            data[4] = 10.811F;
+            data[5] = 12.0107F;
+            data[6] = 14.0067F;
+            data[7] = 15.9994F;
+            data[8] = 18.9984F;
+
+            fbb.Add(data);
+            var endOffset = fbb.Offset;
+            Assert.AreEqual(endOffset, storedOffset + sizeof(float) * data.Length);
+        }
+
+        [FlatBuffersTestMethod]
+        public void FlatBufferBuilder_Add_Array_Bool()
+        {
+            var fbb = CreateBuffer(false);
+            var storedOffset = fbb.Offset;
+
+            const int len = 9;
+
+            // Construct the data array
+            var data = new bool[len];
+            data[0] = true;
+            data[1] = true;
+            data[2] = false;
+            data[3] = true;
+            data[4] = false;
+            data[5] = true;
+            data[6] = true;
+            data[7] = true;
+            data[8] = false;
+
+            fbb.Add(data);
+            var endOffset = fbb.Offset;
+            Assert.AreEqual(endOffset, storedOffset + sizeof(bool) * data.Length);
+        }
+
+        [FlatBuffersTestMethod]
+        public void FlatBufferBuilder_Add_Array_Double()
+        {
+            var fbb = CreateBuffer(false);
+            var storedOffset = fbb.Offset;
+
+            const int len = 9;
+
+            // Construct the data array
+            var data = new double[len];
+            data[0] = 1.0079;
+            data[1] = 4.0026;
+            data[2] = 6.941;
+            data[3] = 9.0122;
+            data[4] = 10.811;
+            data[5] = 12.0107;
+            data[6] = 14.0067;
+            data[7] = 15.9994;
+            data[8] = 18.9984;
+
+            fbb.Add(data);
+            var endOffset = fbb.Offset;
+            Assert.AreEqual(endOffset, storedOffset + sizeof(double) * data.Length);
+        }
+
+        [FlatBuffersTestMethod]
+        public void FlatBufferBuilder_Add_Array_Null_Throws()
+        {
+            var fbb = CreateBuffer(false);
+
+            // Construct the data array
+            float[] data = null;
+
+            Assert.Throws<ArgumentNullException>(() => fbb.Add(data));
+        }
+
+        [FlatBuffersTestMethod]
+        public void FlatBufferBuilder_Add_Array_Empty_Noop()
+        {
+            var fbb = CreateBuffer(false);
+
+            var storedOffset = fbb.Offset;
+
+            // Construct an empty data array
+            float[] data = new float[0];
+            fbb.Add(data);
+
+            // Make sure the offset didn't change since nothing
+            // was really added
+            var endOffset = fbb.Offset;
+            Assert.AreEqual(endOffset, storedOffset);
+        }
     }
 }

tests/FlatBuffers.Test/FlatBuffersExampleTests.cs

@@ -221,6 +221,16 @@ namespace FlatBuffers.Test
             }
             Assert.AreEqual(10, invsum);
 
+            // Get the inventory as an array and subtract the
+            // sum to get it back to 0
+            var inventoryArray = monster.GetInventoryArray();
+            Assert.AreEqual(5, inventoryArray.Length);
+            foreach(var inv in inventoryArray)
+            {
+                invsum -= inv;
+            }
+            Assert.AreEqual(0, invsum);
+
             var test0 = monster.Test4(0).Value;
             var test1 = monster.Test4(1).Value;
             Assert.AreEqual(2, monster.Test4Length);

tests/MyGame/Example/Stat.cs

@@ -19,6 +19,7 @@ public struct Stat : IFlatbufferObject
 
   public string Id { get { int o = __p.__offset(4); return o != 0 ? __p.__string(o + __p.bb_pos) : null; } }
   public ArraySegment<byte>? GetIdBytes() { return __p.__vector_as_arraysegment(4); }
+  public byte[] GetIdArray() { return __p.__vector_as_array<byte>(4); }
   public long Val { get { int o = __p.__offset(6); return o != 0 ? __p.bb.GetLong(o + __p.bb_pos) : (long)0; } }
   public bool MutateVal(long val) { int o = __p.__offset(6); if (o != 0) { __p.bb.PutLong(o + __p.bb_pos, val); return true; } else { return false; } }
   public ushort Count { get { int o = __p.__offset(8); return o != 0 ? __p.bb.GetUshort(o + __p.bb_pos) : (ushort)0; } }

tests/MyGame/Example/TypeAliases.cs

@@ -40,10 +40,12 @@ public struct TypeAliases : IFlatbufferObject
   public sbyte V8(int j) { int o = __p.__offset(24); return o != 0 ? __p.bb.GetSbyte(__p.__vector(o) + j * 1) : (sbyte)0; }
   public int V8Length { get { int o = __p.__offset(24); return o != 0 ? __p.__vector_len(o) : 0; } }
   public ArraySegment<byte>? GetV8Bytes() { return __p.__vector_as_arraysegment(24); }
+  public sbyte[] GetV8Array() { return __p.__vector_as_array<sbyte>(24); }
   public bool MutateV8(int j, sbyte v8) { int o = __p.__offset(24); if (o != 0) { __p.bb.PutSbyte(__p.__vector(o) + j * 1, v8); return true; } else { return false; } }
   public double Vf64(int j) { int o = __p.__offset(26); return o != 0 ? __p.bb.GetDouble(__p.__vector(o) + j * 8) : (double)0; }
   public int Vf64Length { get { int o = __p.__offset(26); return o != 0 ? __p.__vector_len(o) : 0; } }
   public ArraySegment<byte>? GetVf64Bytes() { return __p.__vector_as_arraysegment(26); }
+  public double[] GetVf64Array() { return __p.__vector_as_array<double>(26); }
   public bool MutateVf64(int j, double vf64) { int o = __p.__offset(26); if (o != 0) { __p.bb.PutDouble(__p.__vector(o) + j * 8, vf64); return true; } else { return false; } }
 
   public static Offset<TypeAliases> CreateTypeAliases(FlatBufferBuilder builder,
@@ -88,9 +90,11 @@ public struct TypeAliases : IFlatbufferObject
   public static void AddF64(FlatBufferBuilder builder, double f64) { builder.AddDouble(9, f64, 0.0); }
   public static void AddV8(FlatBufferBuilder builder, VectorOffset v8Offset) { builder.AddOffset(10, v8Offset.Value, 0); }
   public static VectorOffset CreateV8Vector(FlatBufferBuilder builder, sbyte[] data) { builder.StartVector(1, data.Length, 1); for (int i = data.Length - 1; i >= 0; i--) builder.AddSbyte(data[i]); return builder.EndVector(); }
+  public static VectorOffset CreateV8VectorBlock(FlatBufferBuilder builder, sbyte[] data) { builder.StartVector(1, data.Length, 1); builder.Add(data); return builder.EndVector(); }
   public static void StartV8Vector(FlatBufferBuilder builder, int numElems) { builder.StartVector(1, numElems, 1); }
   public static void AddVf64(FlatBufferBuilder builder, VectorOffset vf64Offset) { builder.AddOffset(11, vf64Offset.Value, 0); }
   public static VectorOffset CreateVf64Vector(FlatBufferBuilder builder, double[] data) { builder.StartVector(8, data.Length, 8); for (int i = data.Length - 1; i >= 0; i--) builder.AddDouble(data[i]); return builder.EndVector(); }
+  public static VectorOffset CreateVf64VectorBlock(FlatBufferBuilder builder, double[] data) { builder.StartVector(8, data.Length, 8); builder.Add(data); return builder.EndVector(); }
   public static void StartVf64Vector(FlatBufferBuilder builder, int numElems) { builder.StartVector(8, numElems, 8); }
   public static Offset<TypeAliases> EndTypeAliases(FlatBufferBuilder builder) {
     int o = builder.EndObject();

tests/namespace_test/namespace_test2_generated.ts

 // automatically generated by the FlatBuffers compiler, do not modify
 
-import * as NS9459827973991502386 from "./namespace_test1_generated";
+import * as NS11563891686210618450 from "./namespace_test1_generated";
 /**
  * @constructor
  */
@@ -39,24 +39,24 @@ static getRootAsTableInFirstNS(bb:flatbuffers.ByteBuffer, obj?:TableInFirstNS):T
  * @param {NamespaceA.NamespaceB.TableInNestedNS=} obj
  * @returns {NamespaceA.NamespaceB.TableInNestedNS|null}
  */
-fooTable(obj?:NS9459827973991502386.NamespaceA.NamespaceB.TableInNestedNS):NS9459827973991502386.NamespaceA.NamespaceB.TableInNestedNS|null {
+fooTable(obj?:NS11563891686210618450.NamespaceA.NamespaceB.TableInNestedNS):NS11563891686210618450.NamespaceA.NamespaceB.TableInNestedNS|null {
   var offset = this.bb!.__offset(this.bb_pos, 4);
-  return offset ? (obj || new NS9459827973991502386.NamespaceA.NamespaceB.TableInNestedNS).__init(this.bb!.__indirect(this.bb_pos + offset), this.bb!) : null;
+  return offset ? (obj || new NS11563891686210618450.NamespaceA.NamespaceB.TableInNestedNS).__init(this.bb!.__indirect(this.bb_pos + offset), this.bb!) : null;
 };
 
 /**
  * @returns {NamespaceA.NamespaceB.EnumInNestedNS}
  */
-fooEnum():NS9459827973991502386.NamespaceA.NamespaceB.EnumInNestedNS {
+fooEnum():NS11563891686210618450.NamespaceA.NamespaceB.EnumInNestedNS {
   var offset = this.bb!.__offset(this.bb_pos, 6);
-  return offset ? /** @type {NamespaceA.NamespaceB.EnumInNestedNS} */ (this.bb!.readInt8(this.bb_pos + offset)) : NS9459827973991502386.NamespaceA.NamespaceB.EnumInNestedNS.A;
+  return offset ? /** @type {NamespaceA.NamespaceB.EnumInNestedNS} */ (this.bb!.readInt8(this.bb_pos + offset)) : NS11563891686210618450.NamespaceA.NamespaceB.EnumInNestedNS.A;
 };
 
 /**
  * @param {NamespaceA.NamespaceB.EnumInNestedNS} value
  * @returns {boolean}
  */
-mutate_foo_enum(value:NS9459827973991502386.NamespaceA.NamespaceB.EnumInNestedNS):boolean {
+mutate_foo_enum(value:NS11563891686210618450.NamespaceA.NamespaceB.EnumInNestedNS):boolean {
   var offset = this.bb!.__offset(this.bb_pos, 6);
 
   if (offset === 0) {
@@ -71,9 +71,9 @@ mutate_foo_enum(value:NS9459827973991502386.NamespaceA.NamespaceB.EnumInNestedNS
  * @param {NamespaceA.NamespaceB.StructInNestedNS=} obj
  * @returns {NamespaceA.NamespaceB.StructInNestedNS|null}
  */
-fooStruct(obj?:NS9459827973991502386.NamespaceA.NamespaceB.StructInNestedNS):NS9459827973991502386.NamespaceA.NamespaceB.StructInNestedNS|null {
+fooStruct(obj?:NS11563891686210618450.NamespaceA.NamespaceB.StructInNestedNS):NS11563891686210618450.NamespaceA.NamespaceB.StructInNestedNS|null {
   var offset = this.bb!.__offset(this.bb_pos, 8);
-  return offset ? (obj || new NS9459827973991502386.NamespaceA.NamespaceB.StructInNestedNS).__init(this.bb_pos + offset, this.bb!) : null;
+  return offset ? (obj || new NS11563891686210618450.NamespaceA.NamespaceB.StructInNestedNS).__init(this.bb_pos + offset, this.bb!) : null;
 };
 
 /**
@@ -95,8 +95,8 @@ static addFooTable(builder:flatbuffers.Builder, fooTableOffset:flatbuffers.Offse
  * @param {flatbuffers.Builder} builder
  * @param {NamespaceA.NamespaceB.EnumInNestedNS} fooEnum
  */
-static addFooEnum(builder:flatbuffers.Builder, fooEnum:NS9459827973991502386.NamespaceA.NamespaceB.EnumInNestedNS) {
-  builder.addFieldInt8(1, fooEnum, NS9459827973991502386.NamespaceA.NamespaceB.EnumInNestedNS.A);
+static addFooEnum(builder:flatbuffers.Builder, fooEnum:NS11563891686210618450.NamespaceA.NamespaceB.EnumInNestedNS) {
+  builder.addFieldInt8(1, fooEnum, NS11563891686210618450.NamespaceA.NamespaceB.EnumInNestedNS.A);
 };
 
 /**