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diff --git a/src/boost/libs/convert/test/prepare.hpp b/src/boost/libs/convert/test/prepare.hpp
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+++ b/src/boost/libs/convert/test/prepare.hpp
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+// Boost.Convert test and usage example
+// Copyright (c) 2009-2016 Vladimir Batov.
+// Use, modification and distribution are subject to the Boost Software License,
+// Version 1.0. See http://www.boost.org/LICENSE_1_0.txt.
+
+#ifndef BOOST_CONVERT_TEST_PREPARE_HPP
+#define BOOST_CONVERT_TEST_PREPARE_HPP
+
+#include <boost/array.hpp>
+#include <ctime>
+#include <cstdlib>
+
+// boostinspect:nounnamed
+namespace { namespace local
+{
+    // C1. 18 = 9 positive + 9 negative numbers with the number of digits from 1 to 9.
+    //     Even though INT_MAX(32) = 2147483647, i.e. 10 digits (not to mention long int)
+    //     we only test up to 9 digits as Spirit does not handle more than 9.
+
+    typedef boost::array<my_string, 18> strings; //C1
+    ///////////////////////////////////////////////////////////////////////////
+    // Generate a random number string with N digits
+    std::string
+    gen_int(int digits, bool negative)
+    {
+        std::string result;
+
+        if (negative)                       // Prepend a '-'
+            result += '-';
+
+        result += '1' + (std::rand()%9);         // The first digit cannot be '0'
+
+        for (int i = 1; i < digits; ++i)    // Generate the remaining digits
+            result += '0' + (std::rand()%10);
+        return result;
+    }
+
+    local::strings const&
+    get_strs()
+    {
+        static local::strings strings;
+        static bool            filled;
+        static bool          negative = true;
+
+        if (!filled)
+        {
+            // Seed the random generator
+            std::srand(std::time(0));
+
+            for (size_t k = 0; k < strings.size(); ++k)
+                strings[k] = local::gen_int(k/2 + 1, negative = !negative).c_str();
+
+            filled = true;
+        }
+        return strings;
+    }
+}}
+
+#endif // BOOST_CONVERT_TEST_PREPARE_HPP