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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// <numeric>
// UNSUPPORTED: c++98, c++03, c++11, c++14
// template<class InputIterator, class OutputIterator, class T,
// class BinaryOperation, class UnaryOperation>
// OutputIterator transform_inclusive_scan(InputIterator first, InputIterator last,
// OutputIterator result,
// BinaryOperation binary_op,
// UnaryOperation unary_op);
#include <numeric>
#include <vector>
#include <cassert>
#include <iostream>
#include "test_iterators.h"
template <class T = void>
struct identity : std::unary_function<T, T>
{
constexpr const T& operator()(const T& x) const { return x;}
};
template <>
struct identity<void>
{
template <class T>
constexpr auto operator()(T&& x) const
_NOEXCEPT_(noexcept(_VSTD::forward<T>(x)))
-> decltype (_VSTD::forward<T>(x))
{ return _VSTD::forward<T>(x); }
};
template <class Iter1, class BOp, class UOp, class Iter2>
void
test(Iter1 first, Iter1 last, BOp bop, UOp uop, Iter2 rFirst, Iter2 rLast)
{
std::vector<typename std::iterator_traits<Iter1>::value_type> v;
// Test not in-place
std::transform_inclusive_scan(first, last, std::back_inserter(v), bop, uop);
assert(std::equal(v.begin(), v.end(), rFirst, rLast));
// Test in-place
v.clear();
v.assign(first, last);
std::transform_inclusive_scan(v.begin(), v.end(), v.begin(), bop, uop);
assert(std::equal(v.begin(), v.end(), rFirst, rLast));
}
template <class Iter>
void
test()
{
int ia[] = { 1, 3, 5, 7, 9};
const int pResI0[] = { 1, 4, 9, 16, 25}; // with identity
const int mResI0[] = { 1, 3, 15, 105, 945};
const int pResN0[] = { -1, -4, -9, -16, -25}; // with negate
const int mResN0[] = { -1, 3, -15, 105, -945};
const unsigned sa = sizeof(ia) / sizeof(ia[0]);
static_assert(sa == sizeof(pResI0) / sizeof(pResI0[0])); // just to be sure
static_assert(sa == sizeof(mResI0) / sizeof(mResI0[0])); // just to be sure
static_assert(sa == sizeof(pResN0) / sizeof(pResN0[0])); // just to be sure
static_assert(sa == sizeof(mResN0) / sizeof(mResN0[0])); // just to be sure
for (unsigned int i = 0; i < sa; ++i ) {
test(Iter(ia), Iter(ia + i), std::plus<>(), identity<>(), pResI0, pResI0 + i);
test(Iter(ia), Iter(ia + i), std::multiplies<>(), identity<>(), mResI0, mResI0 + i);
test(Iter(ia), Iter(ia + i), std::plus<>(), std::negate<>(), pResN0, pResN0 + i);
test(Iter(ia), Iter(ia + i), std::multiplies<>(), std::negate<>(), mResN0, mResN0 + i);
}
}
int triangle(int n) { return n*(n+1)/2; }
// Basic sanity
void basic_tests()
{
{
std::vector<int> v(10);
std::fill(v.begin(), v.end(), 3);
std::transform_inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>(), identity<>());
std::copy(v.begin(), v.end(), std::ostream_iterator<int>(std::cout, " "));
std::cout << std::endl;
for (size_t i = 0; i < v.size(); ++i)
assert(v[i] == (int)(i+1) * 3);
}
{
std::vector<int> v(10);
std::iota(v.begin(), v.end(), 0);
std::transform_inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>(), identity<>());
for (size_t i = 0; i < v.size(); ++i)
assert(v[i] == triangle(i));
}
{
std::vector<int> v(10);
std::iota(v.begin(), v.end(), 1);
std::transform_inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>(), identity<>());
for (size_t i = 0; i < v.size(); ++i)
assert(v[i] == triangle(i + 1));
}
{
std::vector<int> v, res;
std::transform_inclusive_scan(v.begin(), v.end(), std::back_inserter(res), std::plus<>(), identity<>());
assert(res.empty());
}
}
int main()
{
basic_tests();
// All the iterator categories
test<input_iterator <const int*> >();
test<forward_iterator <const int*> >();
test<bidirectional_iterator<const int*> >();
test<random_access_iterator<const int*> >();
test<const int*>();
test< int*>();
}
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