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: no-random-device
10
11// <random>
12
13// class random_device;
14
15// result_type operator()();
16
17#include <random>
18#include <cassert>
19#include <string>
20#include <system_error>
21
22#include "test_macros.h"
23
24int main(int, char**)
25{
26 {
27 std::random_device r;
28 std::random_device::result_type e = r();
29 ((void)e); // Prevent unused warning
30 }
31
32 // When using the `/dev/urandom` implementation, make sure that we throw
33 // an exception when we hit EOF while reading the custom-provided file.
34#if !defined(TEST_HAS_NO_EXCEPTIONS) && defined(_LIBCPP_USING_DEV_RANDOM)
35 {
36 std::random_device r("/dev/null");
37 try {
38 (void)r();
39 LIBCPP_ASSERT(false);
40 } catch (const std::system_error&) {
41 }
42 }
43#endif
44
45 return 0;
46}
47

source code of libcxx/test/std/numerics/rand/rand.device/eval.pass.cpp