llvm/libcxx
1
0
Fork 0
mirror of https://github.com/llvm-mirror/libcxx.git synced 2025-10-23 10:07:41 +08:00
Code Issues Packages Projects Releases Wiki Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

20
test/std/algorithms/alg.nonmodifying/alg.count/count_if.pass.cpp
View File

@@ -11,21 +11,31 @@
// template<InputIterator Iter, Predicate<auto, Iter::value_type> Pred>
// requires CopyConstructible<Pred>
// Iter::difference_type
// constexpr Iter::difference_type // constexpr after C++17
// count_if(Iter first, Iter last, Pred pred);
#include <algorithm>
#include <functional>
#include <cassert>
#include "test_macros.h"
#include "test_iterators.h"
struct eq {
eq (int val) : v(val) {}
bool operator () (int v2) const { return v == v2; }
TEST_CONSTEXPR eq (int val) : v(val) {}
TEST_CONSTEXPR bool operator () (int v2) const { return v == v2; }
int v;
};
#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_if(std::begin(ia), std::end(ia), eq(2)) == 3)
&& (std::count_if(std::begin(ib), std::end(ib), eq(9)) == 0)
;
}
#endif
int main()
{
@@ -40,4 +50,8 @@ int main()
assert(std::count_if(input_iterator<const int*>(ia),
input_iterator<const int*>(ia),
eq(2)) == 0);
#if TEST_STD_VER > 17
static_assert(test_constexpr());
#endif
}