| 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 | // UNSUPPORTED: c++03 |
| 10 | |
| 11 | // <random> |
| 12 | |
| 13 | // template<class _IntType = int> |
| 14 | // class uniform_int_distribution |
| 15 | |
| 16 | // template<class _URNG> result_type operator()(_URNG& g); |
| 17 | |
| 18 | |
| 19 | #include <cassert> |
| 20 | #include <cstdint> |
| 21 | #include <limits> |
| 22 | #include <random> |
| 23 | |
| 24 | #include "test_macros.h" |
| 25 | |
| 26 | int main(int, char**) { |
| 27 | |
| 28 | #ifndef TEST_HAS_NO_INT128 |
| 29 | |
| 30 | // Test that values outside of the 64-bit range can be produced. |
| 31 | { |
| 32 | std::minstd_rand0 e; |
| 33 | std::uniform_int_distribution<__int128_t> d; |
| 34 | assert(d.min() == 0 && d.max() == std::numeric_limits<__int128_t>::max()); |
| 35 | bool all_in_64bit_range = true; |
| 36 | for (int i = 0; i < 100; ++i) { |
| 37 | __int128_t n = d(e); |
| 38 | all_in_64bit_range = all_in_64bit_range && (n <= UINT64_MAX); |
| 39 | } |
| 40 | assert(!all_in_64bit_range); |
| 41 | } |
| 42 | |
| 43 | // Same test as above with min/max set and outside the 64-bit range. |
| 44 | { |
| 45 | __int128_t a = ((__int128_t)INT64_MIN) * 10; |
| 46 | __int128_t b = ((__int128_t)INT64_MAX) * 10; |
| 47 | std::minstd_rand0 e; |
| 48 | std::uniform_int_distribution<__int128_t> d(a, b); |
| 49 | assert(d.min() == a && d.max() == b); |
| 50 | bool all_in_64bit_range = true; |
| 51 | for (int i = 0; i < 100; ++i) { |
| 52 | __int128_t n = d(e); |
| 53 | assert(a <= n && n <= b); |
| 54 | all_in_64bit_range = all_in_64bit_range && (INT64_MIN <= n) && (n <= (INT64_MAX)); |
| 55 | } |
| 56 | assert(!all_in_64bit_range); |
| 57 | } |
| 58 | |
| 59 | // Same test as above with __uint128_t. |
| 60 | { |
| 61 | __uint128_t a = UINT64_MAX / 3; |
| 62 | __uint128_t b = ((__uint128_t)UINT64_MAX) * 10; |
| 63 | std::minstd_rand0 e; |
| 64 | std::uniform_int_distribution<__uint128_t> d(a, b); |
| 65 | assert(d.min() == a && d.max() == b); |
| 66 | bool all_in_64bit_range = true; |
| 67 | for (int i = 0; i < 100; ++i) { |
| 68 | __uint128_t n = d(e); |
| 69 | assert(a <= n && n <= b); |
| 70 | all_in_64bit_range = all_in_64bit_range && (n <= (UINT64_MAX)); |
| 71 | } |
| 72 | assert(!all_in_64bit_range); |
| 73 | } |
| 74 | |
| 75 | // Regression test for PR#51520: |
| 76 | { |
| 77 | std::minstd_rand0 e; |
| 78 | std::uniform_int_distribution<__int128_t> d(INT64_MIN, INT64_MAX); |
| 79 | assert(d.min() == INT64_MIN && d.max() == INT64_MAX); |
| 80 | for (int i = 0; i < 100; ++i) { |
| 81 | __int128_t n = d(e); |
| 82 | assert((INT64_MIN <= n) && (n <= INT64_MAX)); |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | #endif // TEST_HAS_NO_INT128 |
| 87 | |
| 88 | return 0; |
| 89 | } |
| 90 |