94 lines
1.8 KiB
C++
94 lines
1.8 KiB
C++
|
//===----------------------------------------------------------------------===//
|
|||
|
|
//
|
|||
|
|
// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>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 k>
|
|||
|
|
// class shuffle_order_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::knuth_b E;
|
|||
|
|
|
|||
|
|
E e;
|
|||
|
|
assert(e() == 152607844u);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
void
|
|||
|
|
test2()
|
|||
|
|
{
|
|||
|
|
typedef rand1<unsigned long long, 0, 0xFFFFFFFFFFFFFFFFull> E0;
|
|||
|
|
typedef std::shuffle_order_engine<E0, 101> E;
|
|||
|
|
E e;
|
|||
|
|
e.discard(400);
|
|||
|
|
assert(e() == 501);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
void
|
|||
|
|
test3()
|
|||
|
|
{
|
|||
|
|
typedef rand1<unsigned long long, 0, 0xFFFFFFFFFFFFFFFFull> E0;
|
|||
|
|
typedef std::shuffle_order_engine<E0, 100> E;
|
|||
|
|
E e;
|
|||
|
|
e.discard(400);
|
|||
|
|
assert(e() == 500);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
int main()
|
|||
|
|
{
|
|||
|
|
test1();
|
|||
|
|
test2();
|
|||
|
|
test3();
|
|||
|
|
}
|