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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___ITERATOR_FRONT_INSERT_ITERATOR_H 11 #define _LIBCPP___ITERATOR_FRONT_INSERT_ITERATOR_H 12 13 #include <__config> 14 #include <__iterator/iterator.h> 15 #include <__iterator/iterator_traits.h> 16 #include <__memory/addressof.h> 17 #include <__utility/move.h> 18 #include <cstddef> 19 20 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 21 # pragma GCC system_header 22 #endif 23 24 _LIBCPP_BEGIN_NAMESPACE_STD 25 26 _LIBCPP_SUPPRESS_DEPRECATED_PUSH 27 template <class _Container> 28 class _LIBCPP_TEMPLATE_VIS front_insert_iterator 29 #if _LIBCPP_STD_VER <= 14 || !defined(_LIBCPP_ABI_NO_ITERATOR_BASES) 30 : public iterator<output_iterator_tag, void, void, void, void> 31 #endif 32 { 33 _LIBCPP_SUPPRESS_DEPRECATED_POP 34 protected: 35 _Container* container; 36 public: 37 typedef output_iterator_tag iterator_category; 38 typedef void value_type; 39 #if _LIBCPP_STD_VER > 17 40 typedef ptrdiff_t difference_type; 41 #else 42 typedef void difference_type; 43 #endif 44 typedef void pointer; 45 typedef void reference; 46 typedef _Container container_type; 47 48 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 explicit front_insert_iterator(_Container& __x) : container(_VSTD::addressof(__x)) {} 49 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 front_insert_iterator& operator=(const typename _Container::value_type& __value) 50 {container->push_front(__value); return *this;} 51 #ifndef _LIBCPP_CXX03_LANG 52 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 front_insert_iterator& operator=(typename _Container::value_type&& __value) 53 {container->push_front(_VSTD::move(__value)); return *this;} 54 #endif // _LIBCPP_CXX03_LANG 55 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 front_insert_iterator& operator*() {return *this;} 56 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 front_insert_iterator& operator++() {return *this;} 57 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 front_insert_iterator operator++(int) {return *this;} 58 }; 59 60 template <class _Container> 61 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 62 front_insert_iterator<_Container> 63 front_inserter(_Container& __x) 64 { 65 return front_insert_iterator<_Container>(__x); 66 } 67 68 _LIBCPP_END_NAMESPACE_STD 69 70 #endif // _LIBCPP___ITERATOR_FRONT_INSERT_ITERATOR_H