Export of internal Abseil changes.

--
7a6ff16a85beb730c172d5d25cf1b5e1be885c56 by Laramie Leavitt <lar@google.com>:

Internal change.

PiperOrigin-RevId: 254454546

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ff8f9bafaefc26d451f576ea4a06d150aed63f6f by Andy Soffer <asoffer@google.com>:

Internal changes

PiperOrigin-RevId: 254451562

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deefc5b651b479ce36f0b4ef203e119c0c8936f2 by CJ Johnson <johnsoncj@google.com>:

Account for subtracting unsigned values from the size of InlinedVector

PiperOrigin-RevId: 254450625

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3c677316a27bcadc17e41957c809ca472d5fef14 by Andy Soffer <asoffer@google.com>:

Add C++17's std::make_from_tuple to absl/utility/utility.h

PiperOrigin-RevId: 254411573

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4ee3536a918830eeec402a28fc31a62c7c90b940 by CJ Johnson <johnsoncj@google.com>:

Adds benchmark for the rest of the InlinedVector public API

PiperOrigin-RevId: 254408378

--
e5a21a00700ee83498ff1efbf649169756463ee4 by CJ Johnson <johnsoncj@google.com>:

Updates the definition of InlinedVector::shrink_to_fit() to be exception safe and adds exception safety tests for it.

PiperOrigin-RevId: 254401387

--
2ea82e72b86d82d78b4e4712a63a55981b53c64b by Laramie Leavitt <lar@google.com>:

Use absl::InsecureBitGen in place of std::mt19937
in tests absl/random/...distribution_test.cc

PiperOrigin-RevId: 254289444

--
fa099e02c413a7ffda732415e8105cad26a90337 by Andy Soffer <asoffer@google.com>:

Internal changes

PiperOrigin-RevId: 254286334

--
ce34b7f36933b30cfa35b9c9a5697a792b5666e4 by Andy Soffer <asoffer@google.com>:

Internal changes

PiperOrigin-RevId: 254273059

--
6f9c473da7c2090c2e85a37c5f00622e8a912a89 by Jorg Brown <jorg@google.com>:

Change absl::container_internal::CompressedTuple to instantiate its
internal Storage class with the name of the type it's holding, rather
than the name of the Tuple.  This is not an externally-visible change,
other than less compiler memory is used and less debug information is
generated.

PiperOrigin-RevId: 254269285

--
8bd3c186bf2fc0c55d8a2dd6f28a5327502c9fba by Andy Soffer <asoffer@google.com>:

Adding short-hand IntervalClosed for IntervalClosedClosed and IntervalOpen for
IntervalOpenOpen.

PiperOrigin-RevId: 254252419

--
ea957f99b6a04fccd42aa05605605f3b44b1ecfd by Abseil Team <absl-team@google.com>:

Do not directly use __SIZEOF_INT128__.

In order to avoid linker errors when building with clang-cl (__fixunsdfti, __udivti3 and __fixunssfti are undefined), this CL uses ABSL_HAVE_INTRINSIC_INT128 which is not defined for clang-cl.

PiperOrigin-RevId: 254250739

--
89ab385cd26b34d64130bce856253aaba96d2345 by Andy Soffer <asoffer@google.com>:

Internal changes

PiperOrigin-RevId: 254242321

--
cffc793d93eca6d6bdf7de733847b6ab4a255ae9 by CJ Johnson <johnsoncj@google.com>:

Adds benchmark for InlinedVector::reserve(size_type)

PiperOrigin-RevId: 254199226

--
c90c7a9fa3c8f0c9d5114036979548b055ea2f2a by Gennadiy Rozental <rogeeff@google.com>:

Import of CCTZ from GitHub.

PiperOrigin-RevId: 254072387

--
c4c388beae016c9570ab54ffa1d52660e4a85b7b by Laramie Leavitt <lar@google.com>:

Internal cleanup.

PiperOrigin-RevId: 254062381

--
d3c992e221cc74e5372d0c8fa410170b6a43c062 by Tom Manshreck <shreck@google.com>:

Update distributions.h to Abseil standards

PiperOrigin-RevId: 254054946

--
d15ad0035c34ef11b14fadc5a4a2d3ec415f5518 by CJ Johnson <johnsoncj@google.com>:

Removes functions with only one caller from the implementation details of InlinedVector by manually inlining the definitions

PiperOrigin-RevId: 254005427

--
2f37e807efc3a8ef1f4b539bdd379917d4151520 by Andy Soffer <asoffer@google.com>:

Initial release of Abseil Random

PiperOrigin-RevId: 253999861

--
24ed1694b6430791d781ed533a8f8ccf6cac5856 by CJ Johnson <johnsoncj@google.com>:

Updates the definition of InlinedVector::assign(...)/InlinedVector::operator=(...) to new, exception-safe implementations with exception safety tests to boot

PiperOrigin-RevId: 253993691

--
5613d95f5a7e34a535cfaeadce801441e990843e by CJ Johnson <johnsoncj@google.com>:

Adds benchmarks for InlinedVector::shrink_to_fit()

PiperOrigin-RevId: 253989647

--
2a96ddfdac40bbb8cb6a7f1aeab90917067c6e63 by Abseil Team <absl-team@google.com>:

Initial release of Abseil Random

PiperOrigin-RevId: 253927497

--
bf1aff8fc9ffa921ad74643e9525ecf25b0d8dc1 by Andy Soffer <asoffer@google.com>:

Initial release of Abseil Random

PiperOrigin-RevId: 253920512

--
bfc03f4a3dcda3cf3a4b84bdb84cda24e3394f41 by Laramie Leavitt <lar@google.com>:

Internal change.

PiperOrigin-RevId: 253886486

--
05036cfcc078ca7c5f581a00dfb0daed568cbb69 by Eric Fiselier <ericwf@google.com>:

Don't include `winsock2.h` because it drags in `windows.h` and friends,
and they define awful macros like OPAQUE, ERROR, and more. This has the
potential to break abseil users.

Instead we only forward declare `timeval` and require Windows users
include `winsock2.h` themselves. This is both inconsistent and poor QoI, but so
including 'windows.h' is bad too.

PiperOrigin-RevId: 253852615
GitOrigin-RevId: 7a6ff16a85beb730c172d5d25cf1b5e1be885c56
Change-Id: Icd6aff87da26f29ec8915da856f051129987cef6

1 files changed, 127 insertions, 0 deletions

diff --git a/absl/random/seed_sequences_test.cc b/absl/random/seed_sequences_test.cc
new file mode 100644
index 000000000000..2cc8b0e6f2b7
--- /dev/null
+++ b/absl/random/seed_sequences_test.cc
@@ -0,0 +1,127 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/seed_sequences.h"
+
+#include <iterator>
+#include <random>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/random/internal/nonsecure_base.h"
+#include "absl/random/random.h"
+namespace {
+
+TEST(SeedSequences, Examples) {
+  {
+    absl::SeedSeq seed_seq({1, 2, 3});
+    absl::BitGen bitgen(seed_seq);
+
+    EXPECT_NE(0, bitgen());
+  }
+  {
+    absl::BitGen engine;
+    auto seed_seq = absl::CreateSeedSeqFrom(&engine);
+    absl::BitGen bitgen(seed_seq);
+
+    EXPECT_NE(engine(), bitgen());
+  }
+  {
+    auto seed_seq = absl::MakeSeedSeq();
+    std::mt19937 random(seed_seq);
+
+    EXPECT_NE(0, random());
+  }
+}
+
+TEST(CreateSeedSeqFrom, CompatibleWithStdTypes) {
+  using ExampleNonsecureURBG =
+      absl::random_internal::NonsecureURBGBase<std::minstd_rand0>;
+
+  // Construct a URBG instance.
+  ExampleNonsecureURBG rng;
+
+  // Construct a Seed Sequence from its variates.
+  auto seq_from_rng = absl::CreateSeedSeqFrom(&rng);
+
+  // Ensure that another URBG can be validly constructed from the Seed Sequence.
+  std::mt19937_64{seq_from_rng};
+}
+
+TEST(CreateSeedSeqFrom, CompatibleWithBitGenerator) {
+  // Construct a URBG instance.
+  absl::BitGen rng;
+
+  // Construct a Seed Sequence from its variates.
+  auto seq_from_rng = absl::CreateSeedSeqFrom(&rng);
+
+  // Ensure that another URBG can be validly constructed from the Seed Sequence.
+  std::mt19937_64{seq_from_rng};
+}
+
+TEST(CreateSeedSeqFrom, CompatibleWithInsecureBitGen) {
+  // Construct a URBG instance.
+  absl::InsecureBitGen rng;
+
+  // Construct a Seed Sequence from its variates.
+  auto seq_from_rng = absl::CreateSeedSeqFrom(&rng);
+
+  // Ensure that another URBG can be validly constructed from the Seed Sequence.
+  std::mt19937_64{seq_from_rng};
+}
+
+TEST(CreateSeedSeqFrom, CompatibleWithRawURBG) {
+  // Construct a URBG instance.
+  std::random_device urandom;
+
+  // Construct a Seed Sequence from its variates, using 64b of seed-material.
+  auto seq_from_rng = absl::CreateSeedSeqFrom(&urandom);
+
+  // Ensure that another URBG can be validly constructed from the Seed Sequence.
+  std::mt19937_64{seq_from_rng};
+}
+
+template <typename URBG>
+void TestReproducibleVariateSequencesForNonsecureURBG() {
+  const size_t kNumVariates = 1000;
+
+  // Master RNG instance.
+  URBG rng;
+  // Reused for both RNG instances.
+  auto reusable_seed = absl::CreateSeedSeqFrom(&rng);
+
+  typename URBG::result_type variates[kNumVariates];
+  {
+    URBG child(reusable_seed);
+    for (auto& variate : variates) {
+      variate = child();
+    }
+  }
+  // Ensure that variate-sequence can be "replayed" by identical RNG.
+  {
+    URBG child(reusable_seed);
+    for (auto& variate : variates) {
+      ASSERT_EQ(variate, child());
+    }
+  }
+}
+
+TEST(CreateSeedSeqFrom, ReproducesVariateSequencesForInsecureBitGen) {
+  TestReproducibleVariateSequencesForNonsecureURBG<absl::InsecureBitGen>();
+}
+
+TEST(CreateSeedSeqFrom, ReproducesVariateSequencesForBitGenerator) {
+  TestReproducibleVariateSequencesForNonsecureURBG<absl::BitGen>();
+}
+}  // namespace