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1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 #ifndef RUNTIME_VM_RANDOM_H_ | 5 #ifndef RUNTIME_VM_RANDOM_H_ |
6 #define RUNTIME_VM_RANDOM_H_ | 6 #define RUNTIME_VM_RANDOM_H_ |
7 | 7 |
8 #include "vm/globals.h" | 8 #include "vm/globals.h" |
9 #include "vm/allocation.h" | 9 #include "vm/allocation.h" |
10 | 10 |
11 namespace dart { | 11 namespace dart { |
12 | 12 |
13 class Random { | 13 class Random { |
14 public: | 14 public: |
15 Random(); | 15 Random(); |
16 // Seed must be non-zero. | 16 // Seed must be non-zero. |
17 explicit Random(uint64_t seed); | 17 explicit Random(uint64_t seed); |
18 ~Random(); | 18 ~Random(); |
19 | 19 |
20 uint32_t NextUInt32(); | 20 uint32_t NextUInt32(); |
21 uint64_t NextUInt64() { | 21 uint64_t NextUInt64() { |
22 return (static_cast<uint64_t>(NextUInt32()) << 32) | | 22 return (static_cast<uint64_t>(NextUInt32()) << 32) | |
23 static_cast<uint64_t>(NextUInt32()); | 23 static_cast<uint64_t>(NextUInt32()); |
24 } | 24 } |
25 | 25 |
26 private: | 26 private: |
27 void NextState(); | 27 void NextState(); |
28 void Initialize(uint64_t seed); | 28 void Initialize(uint64_t seed); |
29 | 29 |
30 uint64_t _state; | 30 uint64_t _state; |
31 | 31 |
32 DISALLOW_COPY_AND_ASSIGN(Random); | 32 DISALLOW_COPY_AND_ASSIGN(Random); |
33 }; | 33 }; |
34 | 34 |
35 } // namespace dart | 35 } // namespace dart |
36 | 36 |
37 #endif // RUNTIME_VM_RANDOM_H_ | 37 #endif // RUNTIME_VM_RANDOM_H_ |
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