blob: bc96a12cd29ccb692ce2a25f858ecf24ee1f55b3 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
// 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>
#include "absl/base/config.h"
namespace absl {
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 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
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_RANDOM_INTERNAL_SEQUENCE_URBG_H_
|
