Abseil Common Libraries (C++) (grcp 依赖)
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60 lines
1.7 KiB
60 lines
1.7 KiB
// 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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