Export of internal Abseil changes.

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

Internal change.

PiperOrigin-RevId: 254454546

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

Internal changes

PiperOrigin-RevId: 254451562

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

Account for subtracting unsigned values from the size of InlinedVector

PiperOrigin-RevId: 254450625

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

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

PiperOrigin-RevId: 254411573

--
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, 204 insertions, 0 deletions

diff --git a/absl/random/internal/explicit_seed_seq_test.cc b/absl/random/internal/explicit_seed_seq_test.cc
new file mode 100644
index 000000000000..a55ad73948b9
--- /dev/null
+++ b/absl/random/internal/explicit_seed_seq_test.cc
@@ -0,0 +1,204 @@
+// 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/internal/explicit_seed_seq.h"
+
+#include <iterator>
+#include <random>
+#include <utility>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/random/seed_sequences.h"
+
+namespace {
+
+template <typename Sseq>
+bool ConformsToInterface() {
+  // Check that the SeedSequence can be default-constructed.
+  { Sseq default_constructed_seq; }
+  // Check that the SeedSequence can be constructed with two iterators.
+  {
+    uint32_t init_array[] = {1, 3, 5, 7, 9};
+    Sseq iterator_constructed_seq(init_array, &init_array[5]);
+  }
+  // Check that the SeedSequence can be std::initializer_list-constructed.
+  { Sseq list_constructed_seq = {1, 3, 5, 7, 9, 11, 13}; }
+  // Check that param() and size() return state provided to constructor.
+  {
+    uint32_t init_array[] = {1, 2, 3, 4, 5};
+    Sseq seq(init_array, &init_array[ABSL_ARRAYSIZE(init_array)]);
+    EXPECT_EQ(seq.size(), ABSL_ARRAYSIZE(init_array));
+
+    uint32_t state_array[ABSL_ARRAYSIZE(init_array)];
+    seq.param(state_array);
+
+    for (int i = 0; i < ABSL_ARRAYSIZE(state_array); i++) {
+      EXPECT_EQ(state_array[i], i + 1);
+    }
+  }
+  // Check for presence of generate() method.
+  {
+    Sseq seq;
+    uint32_t seeds[5];
+
+    seq.generate(seeds, &seeds[ABSL_ARRAYSIZE(seeds)]);
+  }
+  return true;
+}
+}  // namespace
+
+TEST(SeedSequences, CheckInterfaces) {
+  // Control case
+  EXPECT_TRUE(ConformsToInterface<std::seed_seq>());
+
+  // Abseil classes
+  EXPECT_TRUE(ConformsToInterface<absl::random_internal::ExplicitSeedSeq>());
+}
+
+TEST(ExplicitSeedSeq, DefaultConstructorGeneratesZeros) {
+  const size_t kNumBlocks = 128;
+
+  uint32_t outputs[kNumBlocks];
+  absl::random_internal::ExplicitSeedSeq seq;
+  seq.generate(outputs, &outputs[kNumBlocks]);
+
+  for (uint32_t& seed : outputs) {
+    EXPECT_EQ(seed, 0);
+  }
+}
+
+TEST(ExplicitSeeqSeq, SeedMaterialIsForwardedIdentically) {
+  const size_t kNumBlocks = 128;
+
+  uint32_t seed_material[kNumBlocks];
+  std::random_device urandom{"/dev/urandom"};
+  for (uint32_t& seed : seed_material) {
+    seed = urandom();
+  }
+  absl::random_internal::ExplicitSeedSeq seq(seed_material,
+                                             &seed_material[kNumBlocks]);
+
+  // Check that output is same as seed-material provided to constructor.
+  {
+    const size_t kNumGenerated = kNumBlocks / 2;
+    uint32_t outputs[kNumGenerated];
+    seq.generate(outputs, &outputs[kNumGenerated]);
+    for (size_t i = 0; i < kNumGenerated; i++) {
+      EXPECT_EQ(outputs[i], seed_material[i]);
+    }
+  }
+  // Check that SeedSequence is stateless between invocations: Despite the last
+  // invocation of generate() only consuming half of the input-entropy, the same
+  // entropy will be recycled for the next invocation.
+  {
+    const size_t kNumGenerated = kNumBlocks;
+    uint32_t outputs[kNumGenerated];
+    seq.generate(outputs, &outputs[kNumGenerated]);
+    for (size_t i = 0; i < kNumGenerated; i++) {
+      EXPECT_EQ(outputs[i], seed_material[i]);
+    }
+  }
+  // Check that when more seed-material is asked for than is provided, nonzero
+  // values are still written.
+  {
+    const size_t kNumGenerated = kNumBlocks * 2;
+    uint32_t outputs[kNumGenerated];
+    seq.generate(outputs, &outputs[kNumGenerated]);
+    for (size_t i = 0; i < kNumGenerated; i++) {
+      EXPECT_EQ(outputs[i], seed_material[i % kNumBlocks]);
+    }
+  }
+}
+
+TEST(ExplicitSeedSeq, CopyAndMoveConstructors) {
+  using testing::Each;
+  using testing::Eq;
+  using testing::Not;
+  using testing::Pointwise;
+
+  uint32_t entropy[4];
+  std::random_device urandom("/dev/urandom");
+  for (uint32_t& entry : entropy) {
+    entry = urandom();
+  }
+  absl::random_internal::ExplicitSeedSeq seq_from_entropy(std::begin(entropy),
+                                                          std::end(entropy));
+  // Copy constructor.
+  {
+    absl::random_internal::ExplicitSeedSeq seq_copy(seq_from_entropy);
+    EXPECT_EQ(seq_copy.size(), seq_from_entropy.size());
+
+    std::vector<uint32_t> seeds_1;
+    seeds_1.resize(1000, 0);
+    std::vector<uint32_t> seeds_2;
+    seeds_2.resize(1000, 1);
+
+    seq_from_entropy.generate(seeds_1.begin(), seeds_1.end());
+    seq_copy.generate(seeds_2.begin(), seeds_2.end());
+
+    EXPECT_THAT(seeds_1, Pointwise(Eq(), seeds_2));
+  }
+  // Assignment operator.
+  {
+    for (uint32_t& entry : entropy) {
+      entry = urandom();
+    }
+    absl::random_internal::ExplicitSeedSeq another_seq(std::begin(entropy),
+                                                       std::end(entropy));
+
+    std::vector<uint32_t> seeds_1;
+    seeds_1.resize(1000, 0);
+    std::vector<uint32_t> seeds_2;
+    seeds_2.resize(1000, 0);
+
+    seq_from_entropy.generate(seeds_1.begin(), seeds_1.end());
+    another_seq.generate(seeds_2.begin(), seeds_2.end());
+
+    // Assert precondition: Sequences generated by seed-sequences are not equal.
+    EXPECT_THAT(seeds_1, Not(Pointwise(Eq(), seeds_2)));
+
+    // Apply the assignment-operator.
+    another_seq = seq_from_entropy;
+
+    // Re-generate seeds.
+    seq_from_entropy.generate(seeds_1.begin(), seeds_1.end());
+    another_seq.generate(seeds_2.begin(), seeds_2.end());
+
+    // Seeds generated by seed-sequences should now be equal.
+    EXPECT_THAT(seeds_1, Pointwise(Eq(), seeds_2));
+  }
+  // Move constructor.
+  {
+    // Get seeds from seed-sequence constructed from entropy.
+    std::vector<uint32_t> seeds_1;
+    seeds_1.resize(1000, 0);
+    seq_from_entropy.generate(seeds_1.begin(), seeds_1.end());
+
+    // Apply move-constructor move the sequence to another instance.
+    absl::random_internal::ExplicitSeedSeq moved_seq(
+        std::move(seq_from_entropy));
+    std::vector<uint32_t> seeds_2;
+    seeds_2.resize(1000, 1);
+    moved_seq.generate(seeds_2.begin(), seeds_2.end());
+    // Verify that seeds produced by moved-instance are the same as original.
+    EXPECT_THAT(seeds_1, Pointwise(Eq(), seeds_2));
+
+    // Verify that the moved-from instance now behaves like a
+    // default-constructed instance.
+    EXPECT_EQ(seq_from_entropy.size(), 0);
+    seq_from_entropy.generate(seeds_1.begin(), seeds_1.end());
+    EXPECT_THAT(seeds_1, Each(Eq(0)));
+  }
+}