1 // -*- C++ -*-
2 //===----------------------------------------------------------------------===//
3 //
4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5 // See https://llvm.org/LICENSE.txt for license information.
6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #ifndef _LIBCPP___ALGORITHM_FIND_FIRST_OF_H
11 #define _LIBCPP___ALGORITHM_FIND_FIRST_OF_H
12 
13 #include <__config>
14 #include <__iterator/iterator_traits.h>
15 
16 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
17 #pragma GCC system_header
18 #endif
19 
20 _LIBCPP_PUSH_MACROS
21 #include <__undef_macros>
22 
23 _LIBCPP_BEGIN_NAMESPACE_STD
24 
25 template <class _ForwardIterator1, class _ForwardIterator2, class _BinaryPredicate>
26 _LIBCPP_CONSTEXPR_AFTER_CXX11 _ForwardIterator1 __find_first_of_ce(_ForwardIterator1 __first1,
27                                                                    _ForwardIterator1 __last1,
28                                                                    _ForwardIterator2 __first2,
29                                                                    _ForwardIterator2 __last2, _BinaryPredicate __pred) {
30   for (; __first1 != __last1; ++__first1)
31     for (_ForwardIterator2 __j = __first2; __j != __last2; ++__j)
32       if (__pred(*__first1, *__j))
33         return __first1;
34   return __last1;
35 }
36 
37 template <class _ForwardIterator1, class _ForwardIterator2, class _BinaryPredicate>
38 _LIBCPP_NODISCARD_EXT inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 _ForwardIterator1
39 find_first_of(_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2,
40               _ForwardIterator2 __last2, _BinaryPredicate __pred) {
41   return _VSTD::__find_first_of_ce(__first1, __last1, __first2, __last2, __pred);
42 }
43 
44 template <class _ForwardIterator1, class _ForwardIterator2>
45 _LIBCPP_NODISCARD_EXT inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 _ForwardIterator1 find_first_of(
46     _ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2, _ForwardIterator2 __last2) {
47   typedef typename iterator_traits<_ForwardIterator1>::value_type __v1;
48   typedef typename iterator_traits<_ForwardIterator2>::value_type __v2;
49   return _VSTD::__find_first_of_ce(__first1, __last1, __first2, __last2, __equal_to<__v1, __v2>());
50 }
51 
52 _LIBCPP_END_NAMESPACE_STD
53 
54 _LIBCPP_POP_MACROS
55 
56 #endif // _LIBCPP___ALGORITHM_FIND_FIRST_OF_H
57