1 //===----------------------------------------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 // <algorithm>
11
12 // template<InputIterator Iter, Predicate<auto, Iter::value_type> Pred>
13 // requires CopyConstructible<Pred>
14 // constexpr Iter // constexpr after C++17
15 // find_if(Iter first, Iter last, Pred pred);
16
17 #include <algorithm>
18 #include <functional>
19 #include <cassert>
20
21 #include "test_macros.h"
22 #include "test_iterators.h"
23
24 struct eq {
eqeq25 TEST_CONSTEXPR eq (int val) : v(val) {}
operator ()eq26 TEST_CONSTEXPR bool operator () (int v2) const { return v == v2; }
27 int v;
28 };
29
30 #if TEST_STD_VER > 17
test_constexpr()31 TEST_CONSTEXPR bool test_constexpr() {
32 int ia[] = {1, 3, 5, 2, 4, 6};
33 int ib[] = {1, 2, 3, 7, 5, 6};
34 eq c(4);
35 return (std::find_if(std::begin(ia), std::end(ia), c) == ia+4)
36 && (std::find_if(std::begin(ib), std::end(ib), c) == ib+6)
37 ;
38 }
39 #endif
40
main()41 int main()
42 {
43 int ia[] = {0, 1, 2, 3, 4, 5};
44 const unsigned s = sizeof(ia)/sizeof(ia[0]);
45 input_iterator<const int*> r = std::find_if(input_iterator<const int*>(ia),
46 input_iterator<const int*>(ia+s),
47 eq(3));
48 assert(*r == 3);
49 r = std::find_if(input_iterator<const int*>(ia),
50 input_iterator<const int*>(ia+s),
51 eq(10));
52 assert(r == input_iterator<const int*>(ia+s));
53
54 #if TEST_STD_VER > 17
55 static_assert(test_constexpr());
56 #endif
57 }
58