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+// 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 <cstddef>
+#include <cstdint>
+#include <random>
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "absl/random/distributions.h"
+#include "absl/random/random.h"
+
+namespace {
+
+template <typename URBG>
+void TestUniform(URBG* gen) {
+ // [a, b) default-semantics, inferred types.
+ absl::Uniform(*gen, 0, 100); // int
+ absl::Uniform(*gen, 0, 1.0); // Promoted to double
+ absl::Uniform(*gen, 0.0f, 1.0); // Promoted to double
+ absl::Uniform(*gen, 0.0, 1.0); // double
+ absl::Uniform(*gen, -1, 1L); // Promoted to long
+
+ // Roll a die.
+ absl::Uniform(absl::IntervalClosedClosed, *gen, 1, 6);
+
+ // Get a fraction.
+ absl::Uniform(absl::IntervalOpenOpen, *gen, 0.0, 1.0);
+
+ // Assign a value to a random element.
+ std::vector<int> elems = {10, 20, 30, 40, 50};
+ elems[absl::Uniform(*gen, 0u, elems.size())] = 5;
+ elems[absl::Uniform<size_t>(*gen, 0, elems.size())] = 3;
+
+ // Choose some epsilon around zero.
+ absl::Uniform(absl::IntervalOpenOpen, *gen, -1.0, 1.0);
+
+ // (a, b) semantics, inferred types.
+ absl::Uniform(absl::IntervalOpenOpen, *gen, 0, 1.0); // Promoted to double
+
+ // Explict overriding of types.
+ absl::Uniform<int>(*gen, 0, 100);
+ absl::Uniform<int8_t>(*gen, 0, 100);
+ absl::Uniform<int16_t>(*gen, 0, 100);
+ absl::Uniform<uint16_t>(*gen, 0, 100);
+ absl::Uniform<int32_t>(*gen, 0, 1 << 10);
+ absl::Uniform<uint32_t>(*gen, 0, 1 << 10);
+ absl::Uniform<int64_t>(*gen, 0, 1 << 10);
+ absl::Uniform<uint64_t>(*gen, 0, 1 << 10);
+
+ absl::Uniform<float>(*gen, 0.0, 1.0);
+ absl::Uniform<float>(*gen, 0, 1);
+ absl::Uniform<float>(*gen, -1, 1);
+ absl::Uniform<double>(*gen, 0.0, 1.0);
+
+ absl::Uniform<float>(*gen, -1.0, 0);
+ absl::Uniform<double>(*gen, -1.0, 0);
+
+ // Tagged
+ absl::Uniform<double>(absl::IntervalClosedClosed, *gen, 0, 1);
+ absl::Uniform<double>(absl::IntervalClosedOpen, *gen, 0, 1);
+ absl::Uniform<double>(absl::IntervalOpenOpen, *gen, 0, 1);
+ absl::Uniform<double>(absl::IntervalOpenClosed, *gen, 0, 1);
+ absl::Uniform<double>(absl::IntervalClosedClosed, *gen, 0, 1);
+ absl::Uniform<double>(absl::IntervalOpenOpen, *gen, 0, 1);
+
+ absl::Uniform<int>(absl::IntervalClosedClosed, *gen, 0, 100);
+ absl::Uniform<int>(absl::IntervalClosedOpen, *gen, 0, 100);
+ absl::Uniform<int>(absl::IntervalOpenOpen, *gen, 0, 100);
+ absl::Uniform<int>(absl::IntervalOpenClosed, *gen, 0, 100);
+ absl::Uniform<int>(absl::IntervalClosedClosed, *gen, 0, 100);
+ absl::Uniform<int>(absl::IntervalOpenOpen, *gen, 0, 100);
+
+ // With *generator as an R-value reference.
+ absl::Uniform<int>(URBG(), 0, 100);
+ absl::Uniform<double>(URBG(), 0.0, 1.0);
+}
+
+template <typename URBG>
+void TestExponential(URBG* gen) {
+ absl::Exponential<float>(*gen);
+ absl::Exponential<double>(*gen);
+ absl::Exponential<double>(URBG());
+}
+
+template <typename URBG>
+void TestPoisson(URBG* gen) {
+ // [rand.dist.pois] Indicates that the std::poisson_distribution
+ // is parameterized by IntType, however MSVC does not allow 8-bit
+ // types.
+ absl::Poisson<int>(*gen);
+ absl::Poisson<int16_t>(*gen);
+ absl::Poisson<uint16_t>(*gen);
+ absl::Poisson<int32_t>(*gen);
+ absl::Poisson<uint32_t>(*gen);
+ absl::Poisson<int64_t>(*gen);
+ absl::Poisson<uint64_t>(*gen);
+ absl::Poisson<uint64_t>(URBG());
+}
+
+template <typename URBG>
+void TestBernoulli(URBG* gen) {
+ absl::Bernoulli(*gen, 0.5);
+ absl::Bernoulli(*gen, 0.5);
+}
+
+template <typename URBG>
+void TestZipf(URBG* gen) {
+ absl::Zipf<int>(*gen, 100);
+ absl::Zipf<int8_t>(*gen, 100);
+ absl::Zipf<int16_t>(*gen, 100);
+ absl::Zipf<uint16_t>(*gen, 100);
+ absl::Zipf<int32_t>(*gen, 1 << 10);
+ absl::Zipf<uint32_t>(*gen, 1 << 10);
+ absl::Zipf<int64_t>(*gen, 1 << 10);
+ absl::Zipf<uint64_t>(*gen, 1 << 10);
+ absl::Zipf<uint64_t>(URBG(), 1 << 10);
+}
+
+template <typename URBG>
+void TestGaussian(URBG* gen) {
+ absl::Gaussian<float>(*gen, 1.0, 1.0);
+ absl::Gaussian<double>(*gen, 1.0, 1.0);
+ absl::Gaussian<double>(URBG(), 1.0, 1.0);
+}
+
+template <typename URBG>
+void TestLogNormal(URBG* gen) {
+ absl::LogUniform<int>(*gen, 0, 100);
+ absl::LogUniform<int8_t>(*gen, 0, 100);
+ absl::LogUniform<int16_t>(*gen, 0, 100);
+ absl::LogUniform<uint16_t>(*gen, 0, 100);
+ absl::LogUniform<int32_t>(*gen, 0, 1 << 10);
+ absl::LogUniform<uint32_t>(*gen, 0, 1 << 10);
+ absl::LogUniform<int64_t>(*gen, 0, 1 << 10);
+ absl::LogUniform<uint64_t>(*gen, 0, 1 << 10);
+ absl::LogUniform<uint64_t>(URBG(), 0, 1 << 10);
+}
+
+template <typename URBG>
+void CompatibilityTest() {
+ URBG gen;
+
+ TestUniform(&gen);
+ TestExponential(&gen);
+ TestPoisson(&gen);
+ TestBernoulli(&gen);
+ TestZipf(&gen);
+ TestGaussian(&gen);
+ TestLogNormal(&gen);
+}
+
+TEST(std_mt19937_64, Compatibility) {
+ // Validate with std::mt19937_64
+ CompatibilityTest<std::mt19937_64>();
+}
+
+TEST(BitGen, Compatibility) {
+ // Validate with absl::BitGen
+ CompatibilityTest<absl::BitGen>();
+}
+
+TEST(InsecureBitGen, Compatibility) {
+ // Validate with absl::InsecureBitGen
+ CompatibilityTest<absl::InsecureBitGen>();
+}
+
+} // namespace