f5256e16df
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@103516 91177308-0d34-0410-b5e6-96231b3b80d8
142 lines
2.5 KiB
C++
142 lines
2.5 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// <random>
|
|
|
|
// template<class Engine, size_t w, class UIntType>
|
|
// class independent_bits_engine
|
|
|
|
// result_type operator()();
|
|
|
|
#include <random>
|
|
#include <cassert>
|
|
|
|
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:
|
|
|
|
// Temporary work around for lack of constexpr
|
|
static const result_type _Min = Min;
|
|
static const result_type _Max = Max;
|
|
|
|
static const/*expr*/ result_type min() {return Min;}
|
|
static const/*expr*/ result_type max() {return Max;}
|
|
|
|
explicit rand1(result_type sd = Min) : x_(sd)
|
|
{
|
|
if (x_ < Min)
|
|
x_ = Min;
|
|
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()
|
|
{
|
|
test1();
|
|
test2();
|
|
test3();
|
|
test4();
|
|
test5();
|
|
test6();
|
|
test7();
|
|
test8();
|
|
}
|