tests/64bit/test_64bit.fbs

struct LeafStruct {
  a:int;
  b:double;
}

table WrapperTable {
  // A normal 32-bit sized vector that could be very far away (64-bit address).
  vector:[int8] (offset64);
}

table RootTable {
  // A normal 32-bit sized vector, that could be very far away (64-bit address).
  far_vector:[ubyte] (offset64);

  // An inplace value just to check that vtable offsets are correct.
  a:int;

  // A normal 32-bit sized string, that could be very far away (64-bit address).
  far_string:string (offset64);

  // A big 64-bit sized vector, that could be very far away (64-bit address).
  big_vector:[ubyte] (vector64);

  // A normal 32-bit sized string that is no far away (32-bit address).
  near_string:string;

  // A big 64-bit sized vector that is a nested flatbuffers (64-bit address).
  nested_root:[ubyte] (vector64, nested_flatbuffer: "RootTable");

  // A normal 32-bit size vector of structs, that could be very far away 
  // (64-bit address)
  far_struct_vector:[LeafStruct] (offset64);

  // A big 64-bit size vector of structs that could be very far away 
  // (64-bit address)
  big_struct_vector:[LeafStruct] (vector64);

  // A normal 32-bit size vector of tables. Currently 64-bit vectors don't 
  // support tables as it would require serializing a table (32-bit) before the
  // vector (64-bit), which is not allowed.
  //
  // This demonstrates how you could have many vectors in the buffer, by 
  // effectively having a vector of 64-bit vectors. The IDL doesn't support
  // nested vecotrs (e.g.: [[type]] ), so going through a wrapper table allows
  // this.
  many_vectors:[WrapperTable];

  // A vector that has force_align to test that the 32/64 bit region of the
  // builder is respected.
  forced_aligned_vector:[ubyte] (vector64, force_align:32);
}

root_type RootTable;