Add 'third_party/abseil_cpp/' from commit '768eb2ca2857342673fcd462792ce04b8bac3fa3' r/781

git-subtree-dir: third_party/abseil_cpp
git-subtree-mainline: ffb2ae54beb5796cd408fbe15d2d2da09ff37adf
git-subtree-split: 768eb2ca2857342673fcd462792ce04b8bac3fa3

1 files changed, 261 insertions, 0 deletions

diff --git a/third_party/abseil_cpp/absl/random/mock_distributions.h b/third_party/abseil_cpp/absl/random/mock_distributions.h
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+// Copyright 2018 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.
+//
+// -----------------------------------------------------------------------------
+// File: mock_distributions.h
+// -----------------------------------------------------------------------------
+//
+// This file contains mock distribution functions for use alongside an
+// `absl::MockingBitGen` object within the Googletest testing framework. Such
+// mocks are useful to provide deterministic values as return values within
+// (otherwise random) Abseil distribution functions.
+//
+// The return type of each function is a mock expectation object which
+// is used to set the match result.
+//
+// More information about the Googletest testing framework is available at
+// https://github.com/google/googletest
+//
+// Example:
+//
+//   absl::MockingBitGen mock;
+//   EXPECT_CALL(absl::MockUniform<int>(), Call(mock, 1, 1000))
+//     .WillRepeatedly(testing::ReturnRoundRobin({20, 40}));
+//
+//   EXPECT_EQ(absl::Uniform<int>(gen, 1, 1000), 20);
+//   EXPECT_EQ(absl::Uniform<int>(gen, 1, 1000), 40);
+//   EXPECT_EQ(absl::Uniform<int>(gen, 1, 1000), 20);
+//   EXPECT_EQ(absl::Uniform<int>(gen, 1, 1000), 40);
+
+#ifndef ABSL_RANDOM_MOCK_DISTRIBUTIONS_H_
+#define ABSL_RANDOM_MOCK_DISTRIBUTIONS_H_
+
+#include <limits>
+#include <type_traits>
+#include <utility>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/meta/type_traits.h"
+#include "absl/random/distributions.h"
+#include "absl/random/internal/mock_overload_set.h"
+#include "absl/random/mocking_bit_gen.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// -----------------------------------------------------------------------------
+// absl::MockUniform
+// -----------------------------------------------------------------------------
+//
+// Matches calls to absl::Uniform.
+//
+// `absl::MockUniform` is a class template used in conjunction with Googletest's
+// `ON_CALL()` and `EXPECT_CALL()` macros. To use it, default-construct an
+// instance of it inside `ON_CALL()` or `EXPECT_CALL()`, and use `Call(...)` the
+// same way one would define mocks on a Googletest `MockFunction()`.
+//
+// Example:
+//
+//  absl::MockingBitGen mock;
+//  EXPECT_CALL(absl::MockUniform<uint32_t>(), Call(mock))
+//     .WillOnce(Return(123456));
+//  auto x = absl::Uniform<uint32_t>(mock);
+//  assert(x == 123456)
+//
+template <typename R>
+using MockUniform = random_internal::MockOverloadSet<
+    random_internal::UniformDistributionWrapper<R>,
+    R(IntervalClosedOpenTag, MockingBitGen&, R, R),
+    R(IntervalClosedClosedTag, MockingBitGen&, R, R),
+    R(IntervalOpenOpenTag, MockingBitGen&, R, R),
+    R(IntervalOpenClosedTag, MockingBitGen&, R, R), R(MockingBitGen&, R, R),
+    R(MockingBitGen&)>;
+
+// -----------------------------------------------------------------------------
+// absl::MockBernoulli
+// -----------------------------------------------------------------------------
+//
+// Matches calls to absl::Bernoulli.
+//
+// `absl::MockBernoulli` is a class used in conjunction with Googletest's
+// `ON_CALL()` and `EXPECT_CALL()` macros. To use it, default-construct an
+// instance of it inside `ON_CALL()` or `EXPECT_CALL()`, and use `Call(...)` the
+// same way one would define mocks on a Googletest `MockFunction()`.
+//
+// Example:
+//
+//  absl::MockingBitGen mock;
+//  EXPECT_CALL(absl::MockBernoulli(), Call(mock, testing::_))
+//     .WillOnce(Return(false));
+//  assert(absl::Bernoulli(mock, 0.5) == false);
+//
+using MockBernoulli =
+    random_internal::MockOverloadSet<absl::bernoulli_distribution,
+                                     bool(MockingBitGen&, double)>;
+
+// -----------------------------------------------------------------------------
+// absl::MockBeta
+// -----------------------------------------------------------------------------
+//
+// Matches calls to absl::Beta.
+//
+// `absl::MockBeta` is a class used in conjunction with Googletest's `ON_CALL()`
+// and `EXPECT_CALL()` macros. To use it, default-construct an instance of it
+// inside `ON_CALL()` or `EXPECT_CALL()`, and use `Call(...)` the same way one
+// would define mocks on a Googletest `MockFunction()`.
+//
+// Example:
+//
+//  absl::MockingBitGen mock;
+//  EXPECT_CALL(absl::MockBeta(), Call(mock, 3.0, 2.0))
+//     .WillOnce(Return(0.567));
+//  auto x = absl::Beta<double>(mock, 3.0, 2.0);
+//  assert(x == 0.567);
+//
+template <typename RealType>
+using MockBeta =
+    random_internal::MockOverloadSet<absl::beta_distribution<RealType>,
+                                     RealType(MockingBitGen&, RealType,
+                                              RealType)>;
+
+// -----------------------------------------------------------------------------
+// absl::MockExponential
+// -----------------------------------------------------------------------------
+//
+// Matches calls to absl::Exponential.
+//
+// `absl::MockExponential` is a class template used in conjunction with
+// Googletest's `ON_CALL()` and `EXPECT_CALL()` macros. To use it,
+// default-construct an instance of it inside `ON_CALL()` or `EXPECT_CALL()`,
+// and use `Call(...)` the same way one would define mocks on a
+// Googletest `MockFunction()`.
+//
+// Example:
+//
+//  absl::MockingBitGen mock;
+//  EXPECT_CALL(absl::MockExponential<double>(), Call(mock, 0.5))
+//     .WillOnce(Return(12.3456789));
+//  auto x = absl::Exponential<double>(mock, 0.5);
+//  assert(x == 12.3456789)
+//
+template <typename RealType>
+using MockExponential =
+    random_internal::MockOverloadSet<absl::exponential_distribution<RealType>,
+                                     RealType(MockingBitGen&, RealType)>;
+
+// -----------------------------------------------------------------------------
+// absl::MockGaussian
+// -----------------------------------------------------------------------------
+//
+// Matches calls to absl::Gaussian.
+//
+// `absl::MockGaussian` is a class template used in conjunction with
+// Googletest's `ON_CALL()` and `EXPECT_CALL()` macros. To use it,
+// default-construct an instance of it inside `ON_CALL()` or `EXPECT_CALL()`,
+// and use `Call(...)` the same way one would define mocks on a
+// Googletest `MockFunction()`.
+//
+// Example:
+//
+//  absl::MockingBitGen mock;
+//  EXPECT_CALL(absl::MockGaussian<double>(), Call(mock, 16.3, 3.3))
+//     .WillOnce(Return(12.3456789));
+//  auto x = absl::Gaussian<double>(mock, 16.3, 3.3);
+//  assert(x == 12.3456789)
+//
+template <typename RealType>
+using MockGaussian =
+    random_internal::MockOverloadSet<absl::gaussian_distribution<RealType>,
+                                     RealType(MockingBitGen&, RealType,
+                                              RealType)>;
+
+// -----------------------------------------------------------------------------
+// absl::MockLogUniform
+// -----------------------------------------------------------------------------
+//
+// Matches calls to absl::LogUniform.
+//
+// `absl::MockLogUniform` is a class template used in conjunction with
+// Googletest's `ON_CALL()` and `EXPECT_CALL()` macros. To use it,
+// default-construct an instance of it inside `ON_CALL()` or `EXPECT_CALL()`,
+// and use `Call(...)` the same way one would define mocks on a
+// Googletest `MockFunction()`.
+//
+// Example:
+//
+//  absl::MockingBitGen mock;
+//  EXPECT_CALL(absl::MockLogUniform<int>(), Call(mock, 10, 10000, 10))
+//     .WillOnce(Return(1221));
+//  auto x = absl::LogUniform<int>(mock, 10, 10000, 10);
+//  assert(x == 1221)
+//
+template <typename IntType>
+using MockLogUniform = random_internal::MockOverloadSet<
+    absl::log_uniform_int_distribution<IntType>,
+    IntType(MockingBitGen&, IntType, IntType, IntType)>;
+
+// -----------------------------------------------------------------------------
+// absl::MockPoisson
+// -----------------------------------------------------------------------------
+//
+// Matches calls to absl::Poisson.
+//
+// `absl::MockPoisson` is a class template used in conjunction with Googletest's
+// `ON_CALL()` and `EXPECT_CALL()` macros. To use it, default-construct an
+// instance of it inside `ON_CALL()` or `EXPECT_CALL()`, and use `Call(...)` the
+// same way one would define mocks on a Googletest `MockFunction()`.
+//
+// Example:
+//
+//  absl::MockingBitGen mock;
+//  EXPECT_CALL(absl::MockPoisson<int>(), Call(mock, 2.0))
+//     .WillOnce(Return(1221));
+//  auto x = absl::Poisson<int>(mock, 2.0);
+//  assert(x == 1221)
+//
+template <typename IntType>
+using MockPoisson =
+    random_internal::MockOverloadSet<absl::poisson_distribution<IntType>,
+                                     IntType(MockingBitGen&, double)>;
+
+// -----------------------------------------------------------------------------
+// absl::MockZipf
+// -----------------------------------------------------------------------------
+//
+// Matches calls to absl::Zipf.
+//
+// `absl::MockZipf` is a class template used in conjunction with Googletest's
+// `ON_CALL()` and `EXPECT_CALL()` macros. To use it, default-construct an
+// instance of it inside `ON_CALL()` or `EXPECT_CALL()`, and use `Call(...)` the
+// same way one would define mocks on a Googletest `MockFunction()`.
+//
+// Example:
+//
+//  absl::MockingBitGen mock;
+//  EXPECT_CALL(absl::MockZipf<int>(), Call(mock, 1000000, 2.0, 1.0))
+//     .WillOnce(Return(1221));
+//  auto x = absl::Zipf<int>(mock, 1000000, 2.0, 1.0);
+//  assert(x == 1221)
+//
+template <typename IntType>
+using MockZipf =
+    random_internal::MockOverloadSet<absl::zipf_distribution<IntType>,
+                                     IntType(MockingBitGen&, IntType, double,
+                                             double)>;
+
+ABSL_NAMESPACE_END
+}  // namespace absl
+
+#endif  // ABSL_RANDOM_MOCK_DISTRIBUTIONS_H_