[libcxx] r306083 - Implement inclusive_scan/transform_inclusive_scan for C++17.
Marshall Clow via cfe-commits
cfe-commits at lists.llvm.org
Thu Jun 22 22:12:43 PDT 2017
Author: marshall
Date: Fri Jun 23 00:12:42 2017
New Revision: 306083
URL: http://llvm.org/viewvc/llvm-project?rev=306083&view=rev
Log:
Implement inclusive_scan/transform_inclusive_scan for C++17.
Added:
libcxx/trunk/test/std/numerics/numeric.ops/inclusive.scan/
libcxx/trunk/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan.pass.cpp
libcxx/trunk/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op.pass.cpp
libcxx/trunk/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op_init.pass.cpp
libcxx/trunk/test/std/numerics/numeric.ops/transform.inclusive.scan/
libcxx/trunk/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop.pass.cpp
libcxx/trunk/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop_init.pass.cpp
Modified:
libcxx/trunk/include/numeric
Modified: libcxx/trunk/include/numeric
URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/numeric?rev=306083&r1=306082&r2=306083&view=diff
==============================================================================
--- libcxx/trunk/include/numeric (original)
+++ libcxx/trunk/include/numeric Fri Jun 23 00:12:42 2017
@@ -81,6 +81,20 @@ template<class InputIterator, class Outp
exclusive_scan(InputIterator first, InputIterator last,
OutputIterator result, T init, BinaryOperation binary_op); // C++17
+template<class InputIterator, class OutputIterator>
+ OutputIterator
+ inclusive_scan(InputIterator first, InputIterator last, OutputIterator result); // C++17
+
+template<class InputIterator, class OutputIterator, class BinaryOperation>
+ OutputIterator
+ inclusive_scan(InputIterator first, InputIterator last,
+ OutputIterator result, BinaryOperation binary_op); // C++17
+
+template<class InputIterator, class OutputIterator, class BinaryOperation, class T>
+ OutputIterator
+ inclusive_scan(InputIterator first, InputIterator last,
+ OutputIterator result, BinaryOperation binary_op, T init); // C++17
+
template<class InputIterator, class OutputIterator, class T,
class BinaryOperation, class UnaryOperation>
OutputIterator
@@ -88,6 +102,21 @@ template<class InputIterator, class Outp
OutputIterator result, T init,
BinaryOperation binary_op, UnaryOperation unary_op); // C++17
+template<class InputIterator, class OutputIterator,
+ class BinaryOperation, class UnaryOperation>
+ OutputIterator
+ transform_inclusive_scan(InputIterator first, InputIterator last,
+ OutputIterator result,
+ BinaryOperation binary_op, UnaryOperation unary_op); // C++17
+
+template<class InputIterator, class OutputIterator,
+ class BinaryOperation, class UnaryOperation, class T>
+ OutputIterator
+ transform_inclusive_scan(InputIterator first, InputIterator last,
+ OutputIterator result,
+ BinaryOperation binary_op, UnaryOperation unary_op,
+ T init); // C++17
+
template <class InputIterator, class OutputIterator>
OutputIterator
adjacent_difference(InputIterator first, InputIterator last, OutputIterator result);
@@ -295,6 +324,38 @@ exclusive_scan(_InputIterator __first, _
return _VSTD::exclusive_scan(__first, __last, __result, __init, _VSTD::plus<>());
}
+template <class _InputIterator, class _OutputIterator, class _Tp, class _BinaryOp>
+_OutputIterator inclusive_scan(_InputIterator __first, _InputIterator __last,
+ _OutputIterator __result, _BinaryOp __b, _Tp __init)
+{
+ for (; __first != __last; ++__first, (void) ++__result) {
+ __init = __b(__init, *__first);
+ *__result = __init;
+ }
+ return __result;
+}
+
+template <class _InputIterator, class _OutputIterator, class _BinaryOp>
+_OutputIterator inclusive_scan(_InputIterator __first, _InputIterator __last,
+ _OutputIterator __result, _BinaryOp __b)
+{
+ if (__first != __last) {
+ typename std::iterator_traits<_InputIterator>::value_type __init = *__first;
+ *__result++ = __init;
+ if (++__first != __last)
+ return _VSTD::inclusive_scan(__first, __last, __result, __b, __init);
+ }
+
+ return __result;
+}
+
+template <class _InputIterator, class _OutputIterator>
+_OutputIterator inclusive_scan(_InputIterator __first, _InputIterator __last,
+ _OutputIterator __result)
+{
+ return _VSTD::inclusive_scan(__first, __last, __result, std::plus<>());
+}
+
template <class _InputIterator, class _OutputIterator, class _Tp,
class _BinaryOp, class _UnaryOp>
inline _LIBCPP_INLINE_VISIBILITY
@@ -316,6 +377,32 @@ transform_exclusive_scan(_InputIterator
}
return __result;
}
+
+template <class _InputIterator, class _OutputIterator, class _Tp, class _BinaryOp, class _UnaryOp>
+_OutputIterator transform_inclusive_scan(_InputIterator __first, _InputIterator __last,
+ _OutputIterator __result, _BinaryOp __b, _UnaryOp __u, _Tp __init)
+{
+ for (; __first != __last; ++__first, (void) ++__result) {
+ __init = __b(__init, __u(*__first));
+ *__result = __init;
+ }
+
+ return __result;
+}
+
+template <class _InputIterator, class _OutputIterator, class _BinaryOp, class _UnaryOp>
+_OutputIterator transform_inclusive_scan(_InputIterator __first, _InputIterator __last,
+ _OutputIterator __result, _BinaryOp __b, _UnaryOp __u)
+{
+ if (__first != __last) {
+ typename std::iterator_traits<_InputIterator>::value_type __init = __u(*__first);
+ *__result++ = __init;
+ if (++__first != __last)
+ return _VSTD::transform_inclusive_scan(__first, __last, __result, __b, __u, __init);
+ }
+
+ return __result;
+}
#endif
template <class _InputIterator, class _OutputIterator>
Added: libcxx/trunk/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan.pass.cpp
URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan.pass.cpp?rev=306083&view=auto
==============================================================================
--- libcxx/trunk/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan.pass.cpp (added)
+++ libcxx/trunk/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan.pass.cpp Fri Jun 23 00:12:42 2017
@@ -0,0 +1,102 @@
+//===----------------------------------------------------------------------===//
+//
+// 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>
+// OutputIterator inclusive_scan(InputIterator first, InputIterator last,
+// OutputIterator result, T init);
+//
+
+#include <numeric>
+#include <vector>
+#include <cassert>
+
+#include "test_iterators.h"
+
+template <class Iter1, class Iter2>
+void
+test(Iter1 first, Iter1 last, Iter2 rFirst, Iter2 rLast)
+{
+ std::vector<typename std::iterator_traits<Iter1>::value_type> v;
+
+// Not in place
+ std::inclusive_scan(first, last, std::back_inserter(v));
+ assert(std::equal(v.begin(), v.end(), rFirst, rLast));
+
+// In place
+ v.clear();
+ v.assign(first, last);
+ std::inclusive_scan(v.begin(), v.end(), v.begin());
+ assert(std::equal(v.begin(), v.end(), rFirst, rLast));
+}
+
+
+template <class Iter>
+void
+test()
+{
+ int ia[] = {1, 3, 5, 7, 9};
+ const int pRes[] = {1, 4, 9, 16, 25};
+ const unsigned sa = sizeof(ia) / sizeof(ia[0]);
+ static_assert(sa == sizeof(pRes) / sizeof(pRes[0])); // just to be sure
+
+ for (unsigned int i = 0; i < sa; ++i )
+ test(Iter(ia), Iter(ia + i), pRes, pRes + 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::inclusive_scan(v.begin(), v.end(), v.begin());
+ 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::inclusive_scan(v.begin(), v.end(), v.begin());
+ 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::inclusive_scan(v.begin(), v.end(), v.begin());
+ for (size_t i = 0; i < v.size(); ++i)
+ assert(v[i] == triangle(i + 1));
+ }
+
+ {
+ std::vector<int> v, res;
+ std::inclusive_scan(v.begin(), v.end(), std::back_inserter(res));
+ 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*>();
+}
Added: libcxx/trunk/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op.pass.cpp
URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op.pass.cpp?rev=306083&view=auto
==============================================================================
--- libcxx/trunk/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op.pass.cpp (added)
+++ libcxx/trunk/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op.pass.cpp Fri Jun 23 00:12:42 2017
@@ -0,0 +1,112 @@
+//===----------------------------------------------------------------------===//
+//
+// 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>
+// OutputIterator
+// inclusive_scan(InputIterator first, InputIterator last,
+// OutputIterator result,
+// BinaryOperation binary_op); // C++17
+
+#include <numeric>
+#include <vector>
+#include <cassert>
+#include <iostream>
+
+#include "test_iterators.h"
+
+template <class Iter1, class T, class Op, class Iter2>
+void
+test(Iter1 first, Iter1 last, Op op, Iter2 rFirst, Iter2 rLast)
+{
+ std::vector<typename std::iterator_traits<Iter1>::value_type> v;
+
+// Not in place
+ std::inclusive_scan(first, last, std::back_inserter(v), op);
+ assert(std::equal(v.begin(), v.end(), rFirst, rLast));
+
+// In place
+ v.clear();
+ v.assign(first, last);
+ std::inclusive_scan(v.begin(), v.end(), v.begin(), op);
+ assert(std::equal(v.begin(), v.end(), rFirst, rLast));
+}
+
+
+template <class Iter>
+void
+test()
+{
+ int ia[] = {1, 3, 5, 7, 9};
+ const int pRes[] = {1, 4, 9, 16, 25};
+ const int mRes[] = {1, 3, 15, 105, 945};
+ const unsigned sa = sizeof(ia) / sizeof(ia[0]);
+ static_assert(sa == sizeof(pRes) / sizeof(pRes[0])); // just to be sure
+ static_assert(sa == sizeof(mRes) / sizeof(mRes[0])); // just to be sure
+
+ for (unsigned int i = 0; i < sa; ++i ) {
+ test(Iter(ia), Iter(ia + i), std::plus<>(), pRes, pRes + i);
+ test(Iter(ia), Iter(ia + i), std::multiplies<>(), mRes, mRes + 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::inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>());
+ 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::inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>());
+ 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::inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>());
+ for (size_t i = 0; i < v.size(); ++i)
+ assert(v[i] == triangle(i + 1));
+ }
+
+ {
+ std::vector<int> v, res;
+ std::inclusive_scan(v.begin(), v.end(), std::back_inserter(res), std::plus<>());
+ 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*>();
+
+}
+
\ No newline at end of file
Added: libcxx/trunk/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op_init.pass.cpp
URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op_init.pass.cpp?rev=306083&view=auto
==============================================================================
--- libcxx/trunk/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op_init.pass.cpp (added)
+++ libcxx/trunk/test/std/numerics/numeric.ops/inclusive.scan/inclusive_scan_op_init.pass.cpp Fri Jun 23 00:12:42 2017
@@ -0,0 +1,128 @@
+//===----------------------------------------------------------------------===//
+//
+// 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>
+// OutputIterator
+// inclusive_scan(InputIterator first, InputIterator last,
+// OutputIterator result,
+// BinaryOperation binary_op, T init); // C++17
+
+#include <numeric>
+#include <vector>
+#include <cassert>
+
+#include "test_iterators.h"
+
+template <class Iter1, class T, class Op, class Iter2>
+void
+test(Iter1 first, Iter1 last, Op op, T init, Iter2 rFirst, Iter2 rLast)
+{
+ std::vector<typename std::iterator_traits<Iter1>::value_type> v;
+
+// Not in place
+ std::inclusive_scan(first, last, std::back_inserter(v), op, init);
+ assert(std::equal(v.begin(), v.end(), rFirst, rLast));
+
+// In place
+ v.clear();
+ v.assign(first, last);
+ std::inclusive_scan(v.begin(), v.end(), v.begin(), op, init);
+ assert(std::equal(v.begin(), v.end(), rFirst, rLast));
+}
+
+
+template <class Iter>
+void
+test()
+{
+ int ia[] = {1, 3, 5, 7, 9};
+ const int pRes[] = {1, 4, 9, 16, 25};
+ const int mRes[] = {1, 3, 15, 105, 945};
+ const unsigned sa = sizeof(ia) / sizeof(ia[0]);
+ static_assert(sa == sizeof(pRes) / sizeof(pRes[0])); // just to be sure
+ static_assert(sa == sizeof(mRes) / sizeof(mRes[0])); // just to be sure
+
+ for (unsigned int i = 0; i < sa; ++i ) {
+ test(Iter(ia), Iter(ia + i), std::plus<>(), 0, pRes, pRes + i);
+ test(Iter(ia), Iter(ia + i), std::multiplies<>(), 1, mRes, mRes + 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::inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>(), 50);
+ for (size_t i = 0; i < v.size(); ++i)
+ assert(v[i] == 50 + (int)(i+1) * 3);
+ }
+
+ {
+ std::vector<int> v(10);
+ std::iota(v.begin(), v.end(), 0);
+ std::inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>(), 40);
+ for (size_t i = 0; i < v.size(); ++i)
+ assert(v[i] == 40 + triangle(i));
+ }
+
+ {
+ std::vector<int> v(10);
+ std::iota(v.begin(), v.end(), 1);
+ std::inclusive_scan(v.begin(), v.end(), v.begin(), std::plus<>(), 30);
+ for (size_t i = 0; i < v.size(); ++i)
+ assert(v[i] == 30 + triangle(i + 1));
+ }
+
+ {
+ std::vector<int> v, res;
+ std::inclusive_scan(v.begin(), v.end(), std::back_inserter(res), std::plus<>(), 40);
+ assert(res.empty());
+ }
+
+// Make sure that the calculations are done using the init typedef
+ {
+ std::vector<unsigned char> v(10);
+ std::iota(v.begin(), v.end(), 1);
+ std::vector<int> res;
+ std::inclusive_scan(v.begin(), v.end(), std::back_inserter(res), std::multiplies<>(), 1);
+
+ assert(res.size() == 10);
+ int j = 1;
+ assert(res[0] == 1);
+ for (size_t i = 1; i < v.size(); ++i)
+ {
+ j *= i + 1;
+ assert(res[i] == j);
+ }
+ }
+}
+
+
+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*>();
+
+}
+
\ No newline at end of file
Added: libcxx/trunk/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop.pass.cpp
URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop.pass.cpp?rev=306083&view=auto
==============================================================================
--- libcxx/trunk/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop.pass.cpp (added)
+++ libcxx/trunk/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop.pass.cpp Fri Jun 23 00:12:42 2017
@@ -0,0 +1,133 @@
+//===----------------------------------------------------------------------===//
+//
+// 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 _Tp = void>
+struct identity : std::unary_function<_Tp, _Tp>
+{
+ constexpr const _Tp& operator()(const _Tp& __x) const { return __x;}
+};
+
+template <>
+struct identity<void>
+{
+ template <class _Tp>
+ constexpr auto operator()(_Tp&& __x) const
+ _NOEXCEPT_(noexcept(_VSTD::forward<_Tp>(__x)))
+ -> decltype (_VSTD::forward<_Tp>(__x))
+ { return _VSTD::forward<_Tp>(__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*>();
+}
Added: libcxx/trunk/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop_init.pass.cpp
URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop_init.pass.cpp?rev=306083&view=auto
==============================================================================
--- libcxx/trunk/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop_init.pass.cpp (added)
+++ libcxx/trunk/test/std/numerics/numeric.ops/transform.inclusive.scan/transform_inclusive_scan_bop_uop_init.pass.cpp Fri Jun 23 00:12:42 2017
@@ -0,0 +1,160 @@
+//===----------------------------------------------------------------------===//
+//
+// 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,
+// T init);
+
+
+#include <numeric>
+#include <vector>
+#include <cassert>
+
+#include "test_iterators.h"
+
+template <class _Tp = void>
+struct identity : std::unary_function<_Tp, _Tp>
+{
+ constexpr const _Tp& operator()(const _Tp& __x) const { return __x;}
+};
+
+template <>
+struct identity<void>
+{
+ template <class _Tp>
+ constexpr auto operator()(_Tp&& __x) const
+ _NOEXCEPT_(noexcept(_VSTD::forward<_Tp>(__x)))
+ -> decltype (_VSTD::forward<_Tp>(__x))
+ { return _VSTD::forward<_Tp>(__x); }
+};
+
+template <class Iter1, class BOp, class UOp, class T, class Iter2>
+void
+test(Iter1 first, Iter1 last, BOp bop, UOp uop, T init, 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, init);
+ 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, init);
+ 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[] = { 0, 0, 0, 0, 0};
+ const int pResN0[] = { -1, -4, -9, -16, -25}; // with negate
+ const int mResN0[] = { 0, 0, 0, 0, 0};
+ const int pResI2[] = { 3, 6, 11, 18, 27}; // with identity
+ const int mResI2[] = { 2, 6, 30, 210, 1890};
+ const int pResN2[] = { 1, -2, -7, -14, -23}; // with negate
+ const int mResN2[] = { -2, 6, -30, 210, -1890};
+ 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
+ static_assert(sa == sizeof(pResI2) / sizeof(pResI2[0])); // just to be sure
+ static_assert(sa == sizeof(mResI2) / sizeof(mResI2[0])); // just to be sure
+ static_assert(sa == sizeof(pResN2) / sizeof(pResN2[0])); // just to be sure
+ static_assert(sa == sizeof(mResN2) / sizeof(mResN2[0])); // just to be sure
+
+ for (unsigned int i = 0; i < sa; ++i ) {
+ test(Iter(ia), Iter(ia + i), std::plus<>(), identity<>(), 0, pResI0, pResI0 + i);
+ test(Iter(ia), Iter(ia + i), std::multiplies<>(), identity<>(), 0, mResI0, mResI0 + i);
+ test(Iter(ia), Iter(ia + i), std::plus<>(), std::negate<>(), 0, pResN0, pResN0 + i);
+ test(Iter(ia), Iter(ia + i), std::multiplies<>(), std::negate<>(), 0, mResN0, mResN0 + i);
+ test(Iter(ia), Iter(ia + i), std::plus<>(), identity<>(), 2, pResI2, pResI2 + i);
+ test(Iter(ia), Iter(ia + i), std::multiplies<>(), identity<>(), 2, mResI2, mResI2 + i);
+ test(Iter(ia), Iter(ia + i), std::plus<>(), std::negate<>(), 2, pResN2, pResN2 + i);
+ test(Iter(ia), Iter(ia + i), std::multiplies<>(), std::negate<>(), 2, mResN2, mResN2 + 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<>(), 50);
+ for (size_t i = 0; i < v.size(); ++i)
+ assert(v[i] == 50 + (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<>(), 30);
+ for (size_t i = 0; i < v.size(); ++i)
+ assert(v[i] == 30 + 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<>(), 40);
+ for (size_t i = 0; i < v.size(); ++i)
+ assert(v[i] == 40 + triangle(i + 1));
+ }
+
+ {
+ std::vector<int> v, res;
+ std::transform_inclusive_scan(v.begin(), v.end(), std::back_inserter(res), std::plus<>(), identity<>(), 1);
+ assert(res.empty());
+ }
+
+// Make sure that the calculations are done using the init typedef
+ {
+ std::vector<unsigned char> v(10);
+ std::iota(v.begin(), v.end(), 1);
+ std::vector<int> res;
+ std::transform_inclusive_scan(v.begin(), v.end(), std::back_inserter(res), std::multiplies<>(), identity<>(), 1);
+
+ assert(res.size() == 10);
+ int j = 1;
+ assert(res[0] == 1);
+ for (size_t i = 1; i < res.size(); ++i)
+ {
+ j *= i + 1;
+ assert(res[i] == j);
+ }
+ }
+}
+
+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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