Add hash_string_test3.cpp

test/Jamfile.v2

@@ -83,3 +83,5 @@ run detail_is_range_test2.cpp : : : $(fs-path-req) ;
 run hash_container_test.cpp ;
 
 run hash_vector_test2.cpp ;
+
+run hash_string_test3.cpp ;

test/hash_string_test3.cpp

@@ -0,0 +1,42 @@
+// Copyright 2021, 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/core/lightweight_test.hpp>
+#include <string>
+
+void test( unsigned char ch )
+{
+    typedef boost::hash<std::string> hash;
+
+    int const N = 32;
+
+    std::size_t h[ N ];
+
+    std::string v;
+
+    for( int i = 0; i < N; ++i )
+    {
+        h[ i ] = hash()( v );
+
+        BOOST_TEST_EQ( h[ i ], hash()( v ) );
+
+        for( int j = 0; j < i; ++j )
+        {
+            BOOST_TEST_NE( h[ j ], h[ i ] );
+        }
+
+        v.push_back( static_cast<char>( ch ) );
+    }
+}
+
+int main()
+{
+    for( unsigned ch = 0; ch < 256; ++ch )
+    {
+        test( static_cast<unsigned char>( ch ) );
+    }
+
+    return boost::report_errors();
+}