From acfc309f727deacfcea9db90a4f3ff25efa03ee4 Mon Sep 17 00:00:00 2001
From: Peter Dimov <pdimov@gmail.com>
Date: Mon, 2 Dec 2024 18:11:07 +0200
Subject: [PATCH] Add example/xxh128_from_xxh64.cpp

---
 example/Jamfile               |  1 +
 example/xxh128_from_xxh64.cpp | 43 +++++++++++++++++++++++++++++++++++
 test/Jamfile                  |  1 +
 3 files changed, 45 insertions(+)
 create mode 100644 example/xxh128_from_xxh64.cpp

diff --git a/example/Jamfile b/example/Jamfile
index ad7bae3..1b7cde0 100644
--- a/example/Jamfile
+++ b/example/Jamfile
@@ -12,3 +12,4 @@ exe hash_with_uint64_seed : hash_with_uint64_seed.cpp ;
 exe hash_with_byte_seed : hash_with_byte_seed.cpp ;
 exe hash_with_any_seed : hash_with_any_seed.cpp ;
 exe hash_32_64 : hash_32_64.cpp ;
+exe xxh128_from_xxh64 : xxh128_from_xxh64.cpp ;
diff --git a/example/xxh128_from_xxh64.cpp b/example/xxh128_from_xxh64.cpp
new file mode 100644
index 0000000..1f42df2
--- /dev/null
+++ b/example/xxh128_from_xxh64.cpp
@@ -0,0 +1,43 @@
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/hash2/xxhash.hpp>
+#include <boost/hash2/digest.hpp>
+#include <boost/endian/conversion.hpp>
+
+class xxhash_128: private boost::hash2::xxhash_64
+{
+public:
+
+    using result_type = boost::hash2::digest<16>;
+
+    using xxhash_64::xxhash_64;
+    using xxhash_64::update;
+
+    result_type result()
+    {
+        std::uint64_t r1 = xxhash_64::result();
+        std::uint64_t r2 = xxhash_64::result();
+
+        result_type r = {};
+
+        boost::endian::store_little_u64( r.data() + 0, r1 );
+        boost::endian::store_little_u64( r.data() + 8, r2 );
+
+        return r;
+    }
+};
+
+#include <string>
+#include <iostream>
+
+int main()
+{
+    std::string tv( "The quick brown fox jumps over the lazy dog" );
+
+    xxhash_128 hash( 43 );
+    hash.update( tv.data(), tv.size() );
+
+    std::cout << hash.result() << std::endl;
+}
diff --git a/test/Jamfile b/test/Jamfile
index 6e42979..d177d1c 100644
--- a/test/Jamfile
+++ b/test/Jamfile
@@ -170,3 +170,4 @@ link ../example/hash_with_uint64_seed.cpp ;
 link ../example/hash_with_byte_seed.cpp ;
 link ../example/hash_with_any_seed.cpp ;
 link ../example/hash_32_64.cpp ;
+link ../example/xxh128_from_xxh64.cpp ;