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

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

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
}

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
}