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More constexpr (re P0202) - equal and mismatch

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@322527 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Marshall Clow
2018-01-16 02:04:10 +00:00
parent 5af38a078e
commit 4cd596538b
5 changed files with 164 additions and 22 deletions
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36
test/std/algorithms/alg.nonmodifying/alg.equal/equal_pred.pass.cpp
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@@ -12,8 +12,16 @@
// template<InputIterator Iter1, InputIterator Iter2,
// Predicate<auto, Iter1::value_type, Iter2::value_type> Pred>
// requires CopyConstructible<Pred>
// bool
// constexpr bool // constexpr after c++17
// equal(Iter1 first1, Iter1 last1, Iter2 first2, Pred pred);
//
// Introduced in C++14:
// template<InputIterator Iter1, InputIterator Iter2,
// Predicate<auto, Iter1::value_type, Iter2::value_type> Pred>
// requires CopyConstructible<Pred>
// constexpr bool // constexpr after c++17
// equal(Iter1 first1, Iter1 last1, Iter2 first2, Iter2 last2, Pred pred);
#include <algorithm>
#include <functional>
@@ -22,6 +30,28 @@
#include "test_macros.h"
#include "test_iterators.h"
#if TEST_STD_VER > 17
TEST_CONSTEXPR bool eq(int a, int b) { return a == b; }
TEST_CONSTEXPR bool test_constexpr() {
int ia[] = {1, 3, 6, 7};
int ib[] = {1, 3};
int ic[] = {1, 3, 5, 7};
typedef input_iterator<int*> II;
typedef bidirectional_iterator<int*> BI;
return !std::equal(std::begin(ia), std::end(ia), std::begin(ic) , eq)
&& !std::equal(std::begin(ia), std::end(ia), std::begin(ic), std::end(ic), eq)
&& std::equal(std::begin(ib), std::end(ib), std::begin(ic) , eq)
&& !std::equal(std::begin(ib), std::end(ib), std::begin(ic), std::end(ic), eq)
&& std::equal(II(std::begin(ib)), II(std::end(ib)), II(std::begin(ic)) , eq)
&& !std::equal(BI(std::begin(ib)), BI(std::end(ib)), BI(std::begin(ic)), BI(std::end(ic)), eq)
;
}
#endif
int comparison_count = 0;
template <typename T>
bool counting_equals ( const T &a, const T &b ) {
@@ -81,4 +111,8 @@ int main()
random_access_iterator<const int*>(ib+s),
std::equal_to<int>()));
#endif
#if TEST_STD_VER > 17
static_assert(test_constexpr());
#endif
}