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61 lines
1.7 KiB
61 lines
1.7 KiB
2 years ago
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// Copyright 2017 The Abseil Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef ABSL_RANDOM_INTERNAL_SEQUENCE_URBG_H_
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#define ABSL_RANDOM_INTERNAL_SEQUENCE_URBG_H_
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#include <cstdint>
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#include <cstring>
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#include <limits>
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#include <type_traits>
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#include <vector>
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#include "absl/base/config.h"
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namespace absl {
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ABSL_NAMESPACE_BEGIN
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namespace random_internal {
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// `sequence_urbg` is a simple random number generator which meets the
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// requirements of [rand.req.urbg], and is solely for testing absl
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// distributions.
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class sequence_urbg {
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public:
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using result_type = uint64_t;
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static constexpr result_type(min)() {
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return (std::numeric_limits<result_type>::min)();
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}
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static constexpr result_type(max)() {
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return (std::numeric_limits<result_type>::max)();
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}
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sequence_urbg(std::initializer_list<result_type> data) : i_(0), data_(data) {}
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void reset() { i_ = 0; }
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result_type operator()() { return data_[i_++ % data_.size()]; }
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size_t invocations() const { return i_; }
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private:
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size_t i_;
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std::vector<result_type> data_;
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};
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} // namespace random_internal
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ABSL_NAMESPACE_END
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} // namespace absl
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#endif // ABSL_RANDOM_INTERNAL_SEQUENCE_URBG_H_
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