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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// <random>
// template<class Engine, size_t w, class UIntType>
// class independent_bits_engine
// result_type operator()();
#include <random>
#include <cassert>
#include "test_macros.h"
template <class UIntType, UIntType Min, UIntType Max>
class rand1
{
public:
// types
typedef UIntType result_type;
private:
result_type x_;
static_assert(Min < Max, "rand1 invalid parameters");
public:
#if TEST_STD_VER < 11 && defined(_LIBCPP_VERSION)
// Workaround for lack of constexpr in C++03
static const result_type _Min = Min;
static const result_type _Max = Max;
#endif
static TEST_CONSTEXPR result_type min() {return Min;}
static TEST_CONSTEXPR result_type max() {return Max;}
explicit rand1(result_type sd = Min) : x_(sd)
{
if (x_ > Max)
x_ = Max;
}
result_type operator()()
{
result_type r = x_;
if (x_ < Max)
++x_;
else
x_ = Min;
return r;
}
};
void
test1()
{
typedef std::independent_bits_engine<rand1<unsigned, 0, 10>, 16, unsigned> E;
E e;
assert(e() == 6958);
}
void
test2()
{
typedef std::independent_bits_engine<rand1<unsigned, 0, 100>, 16, unsigned> E;
E e;
assert(e() == 66);
}
void
test3()
{
typedef std::independent_bits_engine<rand1<unsigned, 0, 0xFFFFFFFF>, 32, unsigned> E;
E e(5);
assert(e() == 5);
}
void
test4()
{
typedef std::independent_bits_engine<rand1<unsigned, 0, 0xFFFFFFFF>, 7, unsigned> E;
E e(129);
assert(e() == 1);
}
void
test5()
{
typedef std::independent_bits_engine<rand1<unsigned, 2, 3>, 1, unsigned> E;
E e(6);
assert(e() == 1);
}
void
test6()
{
typedef std::independent_bits_engine<rand1<unsigned, 2, 3>, 11, unsigned> E;
E e(6);
assert(e() == 1365);
}
void
test7()
{
typedef std::independent_bits_engine<rand1<unsigned, 2, 3>, 32, unsigned> E;
E e(6);
assert(e() == 2863311530u);
}
void
test8()
{
typedef std::independent_bits_engine<std::mt19937, 64, unsigned long long> E;
E e(6);
assert(e() == 16470362623952407241ull);
}
int main(int, char**)
{
test1();
test2();
test3();
test4();
test5();
test6();
test7();
test8();
return 0;
}
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