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diff --git a/gcc-4.9/libstdc++-v3/testsuite/20_util/hash/chi2_quality.h b/gcc-4.9/libstdc++-v3/testsuite/20_util/hash/chi2_quality.h
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+// Copyright (C) 2010-2014 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// This file uses the chi^2 test to measure the quality of a hash
+// function, by computing the uniformity with which it distributes a set
+// of N strings into k buckets (where k is significantly greater than N).
+//
+// Each bucket has B[i] strings in it. The expected value of each bucket
+// for a uniform distribution is z = N/k, so
+//   chi^2 = Sum_i (B[i] - z)^2 / z.
+//
+// We check whether chi^2 is small enough to be consistent with the
+// hypothesis of a uniform distribution. If F(chi^2, k-1) is close to
+// 0 (where F is the cumulative probability distribution), we can
+// reject that hypothesis. So we don't want F to be too small, which
+// for large k, means we want chi^2 to be not too much larger than k.
+//
+// We use the chi^2 test for several sets of strings. Any non-horrible
+// hash function should do well with purely random strings. A really
+// good hash function will also do well with more structured sets,
+// including ones where the strings differ by only a few bits.
+
+#include <algorithm>
+#include <cstdlib>
+#include <cstdio>
+#include <fstream>
+#include <functional>
+#include <iostream>
+#include <iterator>
+#include <string>
+#include <unordered_set>
+#include <vector>
+#include <testsuite_hooks.h>
+
+#ifndef SAMPLES
+#define SAMPLES 300000
+#endif
+
+template <typename Container>
+  double
+  chi2_hash(const Container& c, long buckets)
+  {
+    std::vector<int> counts(buckets);
+    std::hash<std::string> hasher;
+    double elements = 0;
+    for (auto i = c.begin(); i != c.end(); ++i)
+      {
+        ++counts[hasher(*i) % buckets];
+        ++elements;
+      }
+
+    const double z = elements / buckets;
+    double sum = 0;
+    for (long i = 0; i < buckets; ++i)
+      {
+        double delta = counts[i] - z;
+        sum += delta*delta;
+      }
+    return sum/z;
+  }