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diff --git a/gdax-orderbook-hpp/demo/dependencies/libcds-2.3.2/test/unit/misc/bit_reversal.cpp b/gdax-orderbook-hpp/demo/dependencies/libcds-2.3.2/test/unit/misc/bit_reversal.cpp
new file mode 100644
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--- /dev/null
+++ b/gdax-orderbook-hpp/demo/dependencies/libcds-2.3.2/test/unit/misc/bit_reversal.cpp
@@ -0,0 +1,96 @@
+/*
+    This file is a part of libcds - Concurrent Data Structures library
+
+    (C) Copyright Maxim Khizhinsky (libcds.dev@gmail.com) 2006-2017
+
+    Source code repo: http://github.com/khizmax/libcds/
+    Download: http://sourceforge.net/projects/libcds/files/
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright notice, this
+      list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above copyright notice,
+      this list of conditions and the following disclaimer in the documentation
+      and/or other materials provided with the distribution.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+    FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+    DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+    SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+    CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+    OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#include <cds_test/ext_gtest.h>
+#include <cds/algo/bit_reversal.h>
+
+namespace {
+
+    template <typename UInt>
+    class bit_reversal: public ::testing::Test
+    {
+        typedef UInt uint_type;
+        static std::vector<uint_type> arr_;
+        static size_t const c_size = 100'000'000;
+
+    public:
+        static void SetUpTestCase()
+        {
+            arr_.resize( c_size );
+            for ( size_t i = 0; i < c_size; ++i )
+                arr_[i] = static_cast<uint_type>((i << 32) + (~i));
+        }
+
+        static void TearDownTestCase()
+        {
+            arr_.resize( 0 );
+        }
+
+        template <typename Algo>
+        void test()
+        {
+            Algo f;
+            for ( auto i : arr_ ) {
+                EXPECT_EQ( i, f( f( i )));
+            }
+        }
+
+        template <typename Algo>
+        void test_eq()
+        {
+            Algo f;
+            for ( auto i : arr_ ) {
+                EXPECT_EQ( cds::algo::bit_reversal::swar()( i ), f( i )) << "i=" << i;
+            }
+        }
+    };
+
+    template <typename UInt> std::vector<UInt> bit_reversal<UInt>::arr_;
+
+    typedef bit_reversal<uint32_t> bit_reversal32;
+    typedef bit_reversal<uint64_t> bit_reversal64;
+
+#define TEST_32BIT( x ) \
+    TEST_F( bit_reversal32, x )      { test<cds::algo::bit_reversal::x>(); } \
+    TEST_F( bit_reversal32, x##_eq ) { test_eq<cds::algo::bit_reversal::x>(); }
+
+#define TEST_64BIT( x ) \
+    TEST_F( bit_reversal64, x )      { test<cds::algo::bit_reversal::x>(); } \
+    TEST_F( bit_reversal64, x##_eq ) { test_eq<cds::algo::bit_reversal::x>(); }
+
+    TEST_32BIT( swar )
+    TEST_32BIT( lookup )
+    TEST_32BIT( muldiv )
+
+    TEST_64BIT( swar )
+    TEST_64BIT( lookup )
+    TEST_64BIT( muldiv )
+
+} // namespace