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Still more P0202 constexpr-ifying. This batch is: for_each/for_each_n/lexicographical_compare

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@323147 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Marshall Clow
2018-01-22 20:44:33 +00:00
parent 65d4ee3df0
commit a15161a030
6 changed files with 108 additions and 17 deletions
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23
include/algorithm
View File

@@ -32,11 +32,12 @@ template <class InputIterator, class Predicate>
none_of(InputIterator first, InputIterator last, Predicate pred);
template <class InputIterator, class Function>
Function
constexpr Function // constexpr in C++20
for_each(InputIterator first, InputIterator last, Function f);
template<class InputIterator, class Size, class Function>
InputIterator for_each_n(InputIterator first, Size n, Function f); // C++17
constexpr InputIterator // constexpr in C++20
for_each_n(InputIterator first, Size n, Function f); // C++17
template <class InputIterator, class T>
constexpr InputIterator // constexpr in C++20
@@ -311,7 +312,7 @@ template <class ForwardIterator, class Predicate>
template <class InputIterator, class OutputIterator1,
class OutputIterator2, class Predicate>
pair<OutputIterator1, OutputIterator2>
constexpr pair<OutputIterator1, OutputIterator2> // constexpr in C++20
partition_copy(InputIterator first, InputIterator last,
OutputIterator1 out_true, OutputIterator2 out_false,
Predicate pred);
@@ -607,11 +608,11 @@ template<class T, class Compare>
minmax(initializer_list<T> t, Compare comp); // constexpr in C++14
template <class InputIterator1, class InputIterator2>
bool
constexpr bool // constexpr in C++20
lexicographical_compare(InputIterator1 first1, InputIterator1 last1, InputIterator2 first2, InputIterator2 last2);
template <class InputIterator1, class InputIterator2, class Compare>
bool
constexpr bool // constexpr in C++20
lexicographical_compare(InputIterator1 first1, InputIterator1 last1,
InputIterator2 first2, InputIterator2 last2, Compare comp);
@@ -958,7 +959,7 @@ none_of(_InputIterator __first, _InputIterator __last, _Predicate __pred)
// for_each
template <class _InputIterator, class _Function>
inline _LIBCPP_INLINE_VISIBILITY
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
_Function
for_each(_InputIterator __first, _InputIterator __last, _Function __f)
{
@@ -971,7 +972,7 @@ for_each(_InputIterator __first, _InputIterator __last, _Function __f)
// for_each_n
template <class _InputIterator, class _Size, class _Function>
inline _LIBCPP_INLINE_VISIBILITY
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
_InputIterator
for_each_n(_InputIterator __first, _Size __orig_n, _Function __f)
{
@@ -3288,7 +3289,7 @@ partition(_ForwardIterator __first, _ForwardIterator __last, _Predicate __pred)
template <class _InputIterator, class _OutputIterator1,
class _OutputIterator2, class _Predicate>
pair<_OutputIterator1, _OutputIterator2>
_LIBCPP_CONSTEXPR_AFTER_CXX17 pair<_OutputIterator1, _OutputIterator2>
partition_copy(_InputIterator __first, _InputIterator __last,
_OutputIterator1 __out_true, _OutputIterator2 __out_false,
_Predicate __pred)
@@ -5658,7 +5659,7 @@ set_symmetric_difference(_InputIterator1 __first1, _InputIterator1 __last1,
// lexicographical_compare
template <class _Compare, class _InputIterator1, class _InputIterator2>
bool
_LIBCPP_CONSTEXPR_AFTER_CXX17 bool
__lexicographical_compare(_InputIterator1 __first1, _InputIterator1 __last1,
_InputIterator2 __first2, _InputIterator2 __last2, _Compare __comp)
{
@@ -5673,7 +5674,7 @@ __lexicographical_compare(_InputIterator1 __first1, _InputIterator1 __last1,
}
template <class _InputIterator1, class _InputIterator2, class _Compare>
inline _LIBCPP_INLINE_VISIBILITY
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
bool
lexicographical_compare(_InputIterator1 __first1, _InputIterator1 __last1,
_InputIterator2 __first2, _InputIterator2 __last2, _Compare __comp)
@@ -5689,7 +5690,7 @@ lexicographical_compare(_InputIterator1 __first1, _InputIterator1 __last1,
}
template <class _InputIterator1, class _InputIterator2>
inline _LIBCPP_INLINE_VISIBILITY
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
bool
lexicographical_compare(_InputIterator1 __first1, _InputIterator1 __last1,
_InputIterator2 __first2, _InputIterator2 __last2)

26
test/std/algorithms/alg.modifying.operations/alg.partitions/partition_copy.pass.cpp
View File

@@ -11,7 +11,7 @@
// template <class InputIterator, class OutputIterator1,
// class OutputIterator2, class Predicate>
// pair<OutputIterator1, OutputIterator2>
// constexpr pair<OutputIterator1, OutputIterator2> // constexpr after C++17
// partition_copy(InputIterator first, InputIterator last,
// OutputIterator1 out_true, OutputIterator2 out_false,
// Predicate pred);
@@ -19,13 +19,31 @@
#include <algorithm>
#include <cassert>
#include "test_macros.h"
#include "test_iterators.h"
struct is_odd
{
bool operator()(const int& i) const {return i & 1;}
TEST_CONSTEXPR bool operator()(const int& i) const {return i & 1;}
};
#if TEST_STD_VER > 17
TEST_CONSTEXPR bool test_constexpr() {
int ia[] = {1, 3, 5, 2, 4, 6};
int r1[10] = {0};
int r2[10] = {0};
auto p = std::partition_copy(std::begin(ia), std::end(ia),
std::begin(r1), std::begin(r2), is_odd());
return std::all_of(std::begin(r1), p.first, is_odd())
&& std::all_of(p.first, std::end(r1), [](int a){return a == 0;})
&& std::none_of(std::begin(r2), p.second, is_odd())
&& std::all_of(p.second, std::end(r2), [](int a){return a == 0;})
;
}
#endif
int main()
{
{
@@ -47,4 +65,8 @@ int main()
assert(r2[2] == 6);
assert(r2[3] == 8);
}
#if TEST_STD_VER > 17
static_assert(test_constexpr());
#endif
}

21
test/std/algorithms/alg.nonmodifying/alg.foreach/for_each_n.pass.cpp
View File

@@ -11,14 +11,29 @@
// UNSUPPORTED: c++98, c++03, c++11, c++14
// template<class InputIterator, class Size, class Function>
// InputIterator for_each_n(InputIterator first, Size n, Function f);
// constexpr InputIterator // constexpr after C++17
// for_each_n(InputIterator first, Size n, Function f);
#include <algorithm>
#include <cassert>
#include "test_macros.h"
#include "test_iterators.h"
#if TEST_STD_VER > 17
TEST_CONSTEXPR bool test_constexpr() {
int ia[] = {1, 3, 6, 7};
int expected[] = {3, 5, 8, 9};
const size_t N = 4;
auto it = std::for_each_n(std::begin(ia), N, [](int &a) { a += 2; });
return it == (std::begin(ia) + N)
&& std::equal(std::begin(ia), std::end(ia), std::begin(expected))
;
}
#endif
struct for_each_test
{
for_each_test(int c) : count(c) {}
@@ -58,4 +73,8 @@ int main()
for (unsigned i = 0; i < 1; ++i)
assert(ia[i] == static_cast<int>(i+2));
}
#if TEST_STD_VER > 17
static_assert(test_constexpr());
#endif
}

18
test/std/algorithms/alg.nonmodifying/alg.foreach/test.pass.cpp
View File

@@ -11,14 +11,26 @@
// template<InputIterator Iter, Callable<auto, Iter::reference> Function>
// requires CopyConstructible<Function>
// Function
// constexpr Function // constexpr after C++17
// for_each(Iter first, Iter last, Function f);
#include <algorithm>
#include <cassert>
#include "test_macros.h"
#include "test_iterators.h"
#if TEST_STD_VER > 17
TEST_CONSTEXPR bool test_constexpr() {
int ia[] = {1, 3, 6, 7};
int expected[] = {3, 5, 8, 9};
std::for_each(std::begin(ia), std::end(ia), [](int &a) { a += 2; });
return std::equal(std::begin(ia), std::end(ia), std::begin(expected))
;
}
#endif
struct for_each_test
{
for_each_test(int c) : count(c) {}
@@ -36,4 +48,8 @@ int main()
assert(f.count == s);
for (unsigned i = 0; i < s; ++i)
assert(ia[i] == static_cast<int>(i+1));
#if TEST_STD_VER > 17
static_assert(test_constexpr());
#endif
}

18
test/std/algorithms/alg.sorting/alg.lex.comparison/lexicographical_compare.pass.cpp
View File

@@ -12,14 +12,26 @@
// template<InputIterator Iter1, InputIterator Iter2>
// requires HasLess<Iter1::value_type, Iter2::value_type>
// && HasLess<Iter2::value_type, Iter1::value_type>
// bool
// constexpr bool // constexpr after C++17
// lexicographical_compare(Iter1 first1, Iter1 last1, Iter2 first2, Iter2 last2);
#include <algorithm>
#include <cassert>
#include "test_macros.h"
#include "test_iterators.h"
#if TEST_STD_VER > 17
TEST_CONSTEXPR bool test_constexpr() {
int ia[] = {1, 2, 3};
int ib[] = {1, 3, 5, 2, 4, 6};
return std::lexicographical_compare(std::begin(ia), std::end(ia), std::begin(ib), std::end(ib))
&& !std::lexicographical_compare(std::begin(ib), std::end(ib), std::begin(ia), std::end(ia))
;
}
#endif
template <class Iter1, class Iter2>
void
test()
@@ -66,4 +78,8 @@ int main()
test<const int*, bidirectional_iterator<const int*> >();
test<const int*, random_access_iterator<const int*> >();
test<const int*, const int*>();
#if TEST_STD_VER > 17
static_assert(test_constexpr());
#endif
}

19
test/std/algorithms/alg.sorting/alg.lex.comparison/lexicographical_compare_comp.pass.cpp
View File

@@ -12,7 +12,7 @@
// template<InputIterator Iter1, InputIterator Iter2, CopyConstructible Compare>
// requires Predicate<Compare, Iter1::value_type, Iter2::value_type>
// && Predicate<Compare, Iter2::value_type, Iter1::value_type>
// bool
// constexpr bool // constexpr after C++17
// lexicographical_compare(Iter1 first1, Iter1 last1,
// Iter2 first2, Iter2 last2, Compare comp);
@@ -20,8 +20,21 @@
#include <functional>
#include <cassert>
#include "test_macros.h"
#include "test_iterators.h"
#if TEST_STD_VER > 17
TEST_CONSTEXPR bool test_constexpr() {
int ia[] = {1, 2, 3};
int ib[] = {1, 3, 5, 2, 4, 6};
std::greater<int> pred;
return !std::lexicographical_compare(std::begin(ia), std::end(ia), std::begin(ib), std::end(ib), pred)
&& std::lexicographical_compare(std::begin(ib), std::end(ib), std::begin(ia), std::end(ia), pred)
;
}
#endif
template <class Iter1, class Iter2>
void
test()
@@ -70,4 +83,8 @@ int main()
test<const int*, bidirectional_iterator<const int*> >();
test<const int*, random_access_iterator<const int*> >();
test<const int*, const int*>();
#if TEST_STD_VER > 17
static_assert(test_constexpr());
#endif
}