From 000276988f21e05191cca87d3a010506b477d274 Mon Sep 17 00:00:00 2001
From: Peter Dimov <pdimov@gmail.com>
Date: Thu, 28 Apr 2022 21:13:23 +0300
Subject: [PATCH] Add hash_string_test2

---
 test/Jamfile.v2            |  1 +
 test/hash_string_test2.cpp | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+)
 create mode 100644 test/hash_string_test2.cpp

diff --git a/test/Jamfile.v2 b/test/Jamfile.v2
index c46e8ff..a5175e1 100644
--- a/test/Jamfile.v2
+++ b/test/Jamfile.v2
@@ -86,3 +86,4 @@ explicit container_hash/hash_no_generic_float ;
 build-project ../examples ;
 
 run hash_reference_values.cpp ;
+run hash_string_test2.cpp ;
diff --git a/test/hash_string_test2.cpp b/test/hash_string_test2.cpp
new file mode 100644
index 0000000..abca666
--- /dev/null
+++ b/test/hash_string_test2.cpp
@@ -0,0 +1,34 @@
+// Copyright 2022 Peter Dimov.
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/container_hash/hash.hpp>
+#include <boost/utility/string_view.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/config.hpp>
+#include <string>
+#if !defined(BOOST_NO_CXX17_HDR_STRING_VIEW)
+#include <string_view>
+#endif
+
+// Test whether the hash values of a string and a
+// string_view that refers to it match. This is
+// important for unordered heterogeneous lookups.
+
+template<class T> std::size_t hv( T const& t )
+{
+    return boost::hash<T>()( t );
+}
+
+int main()
+{
+    std::string s( "Test." );
+
+    BOOST_TEST_EQ( hv( s ), hv( boost::string_view( s ) ) );
+
+#if !defined(BOOST_NO_CXX17_HDR_STRING_VIEW)
+    BOOST_TEST_EQ( hv( s ), hv( std::string_view( s ) ) );
+#endif
+
+    return boost::report_errors();
+}