1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// <random>
10
11// template <class UIntType, UIntType a, UIntType c, UIntType m>
12// class linear_congruential_engine;
13
14// void discard(unsigned long long z);
15
16#include <random>
17#include <cassert>
18
19#include "test_macros.h"
20
21template <class T>
22void
23rand0()
24{
25 typedef std::linear_congruential_engine<T, 16807, 0, 2147483647> E;
26 E e;
27 e.discard(9999);
28 assert(e() == 1043618065);
29}
30
31template <class T>
32void
33rand()
34{
35 typedef std::linear_congruential_engine<T, 48271, 0, 2147483647> E;
36 E e;
37 e.discard(9999);
38 assert(e() == 399268537);
39}
40
41template <class T>
42void
43other()
44{
45 typedef std::linear_congruential_engine<T, 48271, 123465789, 2147483647> E;
46 E e1;
47 E e2;
48 assert(e1 == e2);
49 e1.discard(1);
50 assert(e1 != e2);
51 (void)e2();
52 assert(e1 == e2);
53 e1.discard(3);
54 assert(e1 != e2);
55 (void)e2();
56 (void)e2();
57 (void)e2();
58 assert(e1 == e2);
59}
60
61int main(int, char**)
62{
63 rand0<unsigned int>();
64 rand0<unsigned long>();
65 rand0<unsigned long long>();
66
67 rand<unsigned int>();
68 rand<unsigned long>();
69 rand<unsigned long long>();
70
71 other<unsigned int>();
72 other<unsigned long>();
73 other<unsigned long long>();
74
75 return 0;
76}
77

source code of libcxx/test/std/numerics/rand/rand.eng/rand.eng.lcong/discard.pass.cpp