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// Copyright (c) 2019 Google LLC
//
// 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
//
// http://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 "source/fuzz/pseudo_random_generator.h"
#include <cassert>
namespace spvtools {
namespace fuzz {
PseudoRandomGenerator::PseudoRandomGenerator(uint32_t seed) : mt_(seed) {}
PseudoRandomGenerator::~PseudoRandomGenerator() = default;
uint32_t PseudoRandomGenerator::RandomUint32(uint32_t bound) {
assert(bound > 0 && "Bound must be positive");
return std::uniform_int_distribution<uint32_t>(0, bound - 1)(mt_);
}
uint64_t PseudoRandomGenerator::RandomUint64(uint64_t bound) {
assert(bound > 0 && "Bound must be positive");
return std::uniform_int_distribution<uint64_t>(0, bound - 1)(mt_);
}
bool PseudoRandomGenerator::RandomBool() {
return static_cast<bool>(std::uniform_int_distribution<>(0, 1)(mt_));
}
uint32_t PseudoRandomGenerator::RandomPercentage() {
// We use 101 because we want a result in the closed interval [0, 100], and
// RandomUint32 is not inclusive of its bound.
return RandomUint32(101);
}
double PseudoRandomGenerator::RandomDouble() {
return std::uniform_real_distribution<double>(0.0, 1.0)(mt_);
}
} // namespace fuzz
} // namespace spvtools
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