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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.
#ifndef Y_ABSL_RANDOM_INTERNAL_SEQUENCE_URBG_H_
#define Y_ABSL_RANDOM_INTERNAL_SEQUENCE_URBG_H_
#include <cstdint>
#include <cstring>
#include <limits>
#include <type_traits>
#include <vector>
#include "y_absl/base/config.h"
namespace y_absl {
Y_ABSL_NAMESPACE_BEGIN
namespace random_internal {
// `sequence_urbg` is a simple random number generator which meets the
// requirements of [rand.req.urbg], and is solely for testing y_absl
// distributions.
class sequence_urbg {
public:
using result_type = uint64_t;
static constexpr result_type(min)() {
return (std::numeric_limits<result_type>::min)();
}
static constexpr result_type(max)() {
return (std::numeric_limits<result_type>::max)();
}
sequence_urbg(std::initializer_list<result_type> data) : i_(0), data_(data) {}
void reset() { i_ = 0; }
result_type operator()() { return data_[i_++ % data_.size()]; }
size_t invocations() const { return i_; }
private:
size_t i_;
std::vector<result_type> data_;
};
} // namespace random_internal
Y_ABSL_NAMESPACE_END
} // namespace y_absl
#endif // Y_ABSL_RANDOM_INTERNAL_SEQUENCE_URBG_H_
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