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More constexpr from P0202. count and count_if. Also fix a comment that Morwenn noted.

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@322506 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Marshall Clow
2018-01-15 19:40:34 +00:00
parent 82091c2583
commit 0dc8ca7729
3 changed files with 39 additions and 10 deletions
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17
test/std/algorithms/alg.nonmodifying/alg.count/count.pass.cpp
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@@ -11,14 +11,25 @@
// template<InputIterator Iter, class T>
// requires HasEqualTo<Iter::value_type, T>
// Iter::difference_type
// constexpr Iter::difference_type // constexpr after C++17
// count(Iter first, Iter last, const T& value);
#include <algorithm>
#include <cassert>
#include "test_macros.h"
#include "test_iterators.h"
#if TEST_STD_VER > 17
TEST_CONSTEXPR bool test_constexpr() {
int ia[] = {0, 1, 2, 2, 0, 1, 2, 3};
int ib[] = {1, 2, 3, 4, 5, 6};
return (std::count(std::begin(ia), std::end(ia), 2) == 3)
&& (std::count(std::begin(ib), std::end(ib), 9) == 0)
;
}
#endif
int main()
{
int ia[] = {0, 1, 2, 2, 0, 1, 2, 3};
@@ -29,4 +40,8 @@ int main()
input_iterator<const int*>(ia + sa), 7) == 0);
assert(std::count(input_iterator<const int*>(ia),
input_iterator<const int*>(ia), 2) == 0);
#if TEST_STD_VER > 17
static_assert(test_constexpr());
#endif
}