Abseil Common Libraries (C++) (grcp 依赖)
https://abseil.io/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
57 lines
1.6 KiB
57 lines
1.6 KiB
6 years ago
|
// 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 ABSL_RANDOM_INTERNAL_SEQUENCE_URBG_H_
|
||
|
#define ABSL_RANDOM_INTERNAL_SEQUENCE_URBG_H_
|
||
|
|
||
|
#include <cstdint>
|
||
|
#include <cstring>
|
||
|
#include <limits>
|
||
|
#include <type_traits>
|
||
|
#include <vector>
|
||
|
|
||
|
namespace absl {
|
||
|
namespace random_internal {
|
||
|
|
||
|
// `sequence_urbg` is a simple random number generator which meets the
|
||
|
// requirements of [rand.req.urbg], and is solely for testing 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
|
||
|
} // namespace absl
|
||
|
|
||
|
#endif // ABSL_RANDOM_INTERNAL_SEQUENCE_URBG_H_
|