1 | /** |
---|---|
2 | * Copyright (c) Glow Contributors. See CONTRIBUTORS file. |
3 | * |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
5 | * you may not use this file except in compliance with the License. |
6 | * You may obtain a copy of the License at |
7 | * |
8 | * http://www.apache.org/licenses/LICENSE-2.0 |
9 | * |
10 | * Unless required by applicable law or agreed to in writing, software |
11 | * distributed under the License is distributed on an "AS IS" BASIS, |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
13 | * See the License for the specific language governing permissions and |
14 | * limitations under the License. |
15 | */ |
16 | |
17 | #include "glow/Support/Random.h" |
18 | #include "llvm/Support/CommandLine.h" |
19 | |
20 | #include <cassert> |
21 | |
22 | static llvm::cl::opt<glow::PseudoRNG::result_type> |
23 | pseudoRandomSeed("pseudo-random-seed", |
24 | llvm::cl::desc("Seed for pseudo-random numbers"), |
25 | llvm::cl::init(glow::PseudoRNG::Engine::default_seed)); |
26 | |
27 | namespace glow { |
28 | |
29 | PseudoRNG::PseudoRNG() : engine_(pseudoRandomSeed.getValue()) {} |
30 | |
31 | // Constant uniform distribution used as a template in nextRand. |
32 | // This computes the parameters once instead of on each call. |
33 | const static std::uniform_real_distribution<> uniformReal(-1, 1); |
34 | |
35 | double PseudoRNG::nextRand() { |
36 | return std::uniform_real_distribution<double>(uniformReal.param())(engine_); |
37 | } |
38 | |
39 | double PseudoRNG::nextRandReal(double a, double b) { |
40 | return std::uniform_real_distribution<double>(a, b)(engine_); |
41 | } |
42 | |
43 | } // namespace glow |
44 |