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Unified Diff: base/rand_util.cc

Issue 1647803004: Move base to DEPS (Closed) Base URL: git@github.com:domokit/mojo.git@master
Patch Set: Created 4 years, 11 months ago
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Index: base/rand_util.cc
diff --git a/base/rand_util.cc b/base/rand_util.cc
deleted file mode 100644
index 931eb4e943e646e2f39e2848b33683247b5b4725..0000000000000000000000000000000000000000
--- a/base/rand_util.cc
+++ /dev/null
@@ -1,72 +0,0 @@
-// Copyright (c) 2011 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.
-
-#include "base/rand_util.h"
-
-#include <math.h>
-#include <stdint.h>
-
-#include <algorithm>
-#include <limits>
-
-#include "base/basictypes.h"
-#include "base/logging.h"
-#include "base/strings/string_util.h"
-
-namespace base {
-
-int RandInt(int min, int max) {
- DCHECK_LE(min, max);
-
- uint64 range = static_cast<uint64>(max) - min + 1;
- int result = min + static_cast<int>(base::RandGenerator(range));
- DCHECK_GE(result, min);
- DCHECK_LE(result, max);
- return result;
-}
-
-double RandDouble() {
- return BitsToOpenEndedUnitInterval(base::RandUint64());
-}
-
-double BitsToOpenEndedUnitInterval(uint64 bits) {
- // We try to get maximum precision by masking out as many bits as will fit
- // in the target type's mantissa, and raising it to an appropriate power to
- // produce output in the range [0, 1). For IEEE 754 doubles, the mantissa
- // is expected to accommodate 53 bits.
-
- COMPILE_ASSERT(std::numeric_limits<double>::radix == 2, otherwise_use_scalbn);
- static const int kBits = std::numeric_limits<double>::digits;
- uint64 random_bits = bits & ((UINT64_C(1) << kBits) - 1);
- double result = ldexp(static_cast<double>(random_bits), -1 * kBits);
- DCHECK_GE(result, 0.0);
- DCHECK_LT(result, 1.0);
- return result;
-}
-
-uint64 RandGenerator(uint64 range) {
- DCHECK_GT(range, 0u);
- // We must discard random results above this number, as they would
- // make the random generator non-uniform (consider e.g. if
- // MAX_UINT64 was 7 and |range| was 5, then a result of 1 would be twice
- // as likely as a result of 3 or 4).
- uint64 max_acceptable_value =
- (std::numeric_limits<uint64>::max() / range) * range - 1;
-
- uint64 value;
- do {
- value = base::RandUint64();
- } while (value > max_acceptable_value);
-
- return value % range;
-}
-
-std::string RandBytesAsString(size_t length) {
- DCHECK_GT(length, 0u);
- std::string result;
- RandBytes(WriteInto(&result, length + 1), length);
- return result;
-}
-
-} // namespace base
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