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 RealType = double>
12// class exponential_distribution
13
14// explicit exponential_distribution(RealType lambda = 1.0); // before C++20
15// exponential_distribution() : exponential_distribution(1.0) {} // C++20
16// explicit exponential_distribution(RealType lambda); // C++20
17
18#include <random>
19#include <cassert>
20
21#include "test_macros.h"
22#if TEST_STD_VER >= 11
23#include "make_implicit.h"
24#include "test_convertible.h"
25#endif
26
27template <class T>
28void test_implicit() {
29#if TEST_STD_VER >= 11
30 typedef std::exponential_distribution<T> D;
31 static_assert(test_convertible<D>(), "");
32 assert(D(1) == make_implicit<D>());
33 static_assert(!test_convertible<D, T>(), "");
34#endif
35}
36
37int main(int, char**)
38{
39 {
40 typedef std::exponential_distribution<> D;
41 D d;
42 assert(d.lambda() == 1);
43 }
44 {
45 typedef std::exponential_distribution<> D;
46 D d(3.5);
47 assert(d.lambda() == 3.5);
48 }
49
50 test_implicit<float>();
51 test_implicit<double>();
52
53 return 0;
54}
55

source code of libcxx/test/std/numerics/rand/rand.dist/rand.dist.pois/rand.dist.pois.exp/ctor_double.pass.cpp