RAPPOR implementation

components/rappor/rappor_parameters.h

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef COMPONENTS_RAPPOR_RAPPOR_PARAMETERS_H_
+#define COMPONENTS_RAPPOR_RAPPOR_PARAMETERS_H_
+
+#include <string>
+
+namespace rappor {
+
+enum Probability {
+  PROBABILITY_75,    // 75%
+  PROBABILITY_50,    // 50%
+};
+
+// An object describing a rappor metric and the parameters used to generate it.
+//
+// For a full description of the rappor metrics, see
+// http://www.chromium.org/developers/design-documents/rappor
+struct RapporParameters {
+  // Get a string representing the parameters, for DCHECK_EQ.
+  std::string ToString() const;

[Ilya Sherman, 2014/02/13 01:39:03]

nit: Why not export an operator== instead?

[Steven Holte, 2014/02/13 05:11:12]

Then the DCHECK won't show what is different.

+
+  // The number of bytes stored in the Bloom filter.
+  int bloom_filter_size_bytes;
+  // The number of hash functions used in the Bloom filter.
+  int bloom_filter_hash_function_count;
+
+  // The probability that a bit will be redacted with fake data.
+  Probability fake_prob;
+  // The probability that a fake bit will be a one.
+  Probability fake_one_prob;
+
+  // The probability that a one bit in the redacted data reports as one.
+  Probability one_coin_prob;
+  // The probability that a zero bit in the redacted data reports as one.
+  Probability zero_coin_prob;
+};
+
+}  // namespace rappor
+
+#endif  // COMPONENTS_RAPPOR_RAPPOR_PARAMETERS_H_