xtd 0.2.0
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__enumerable_collection.hpp
Go to the documentation of this file.
1
4#pragma once
6#if !defined(__XTD_CORE_INTERNAL__)
7#error "Do not include this file: Internal use only"
8#endif
10
13#include "../istringable.hpp"
14
16namespace xtd::linq {
17 class enumerable;
18};
19
20template<class type_t, class param_t>
21struct __opaque_xtd_linq_lazy_enumerable__ : xtd::collections::generic::ienumerable<type_t>, xtd::istringable {
22 xtd::collections::generic::enumerator<type_t> get_enumerator() const override {
23 return {xtd::new_ptr<lazy_enumerator>(data_->params, data_->move_next, data_->reset)};
24 }
25
26 xtd::string to_string() const override;
27
28private:
29 friend class xtd::linq::enumerable;
30 using param_type = param_t;
31 using move_next_type = std::function<bool(param_type&)>;
32 using reset_type = std::function<void(param_type&)>;
33
34 __opaque_xtd_linq_lazy_enumerable__() = default;
35 __opaque_xtd_linq_lazy_enumerable__(__opaque_xtd_linq_lazy_enumerable__&&) = default;
36 __opaque_xtd_linq_lazy_enumerable__(const __opaque_xtd_linq_lazy_enumerable__&) = default;
37 __opaque_xtd_linq_lazy_enumerable__& operator =(const __opaque_xtd_linq_lazy_enumerable__&) = default;
38 __opaque_xtd_linq_lazy_enumerable__(const param_type& params, move_next_type move_next, reset_type reset) {
39 data_->params = params;
40 data_->move_next = move_next;
41 data_->reset = reset;
42 }
43
44 struct lazy_enumerator : xtd::collections::generic::ienumerator<type_t> {
45 lazy_enumerator(param_type& params, move_next_type& move_next, reset_type& reset) : params_ {params}, move_next_ {move_next}, reset_ {reset} {}
46
47 const type_t& current() const override {
48 return std::get<0>(params_);
49 }
50 bool move_next() override {
51 return move_next_(params_);
52 }
53 void reset() override {
54 reset_(params_);
55 }
56
57 private:
58 param_type& params_;
59 move_next_type& move_next_;
60 reset_type& reset_;
61 };
62
63 struct data {
64 param_type params;
65 move_next_type move_next;
66 reset_type reset;
67 };
68
69 mutable xtd::ptr<data> data_ = xtd::new_ptr<data>();
70};
71
72template<class type_t>
73struct __opaque_xtd_linq_enumerable_collection__ : xtd::collections::generic::ienumerable<type_t>, xtd::istringable {
74 xtd::collections::generic::enumerator<type_t> get_enumerator() const override {
76 }
77
78 xtd::string to_string() const override;
79
80 operator const __xtd_raw_array_data__<type_t>& () const noexcept {return items;}
81 operator __xtd_raw_array_data__<type_t>& () noexcept {return items;}
82
83private:
84 friend class xtd::linq::enumerable;
85 __opaque_xtd_linq_enumerable_collection__() = default;
86 __xtd_raw_array_data__<type_t> items;
87};
Exposes the enumerator, which supports a simple iteration over a collection of a specified type.
Definition ienumerable.hpp:40
virtual xtd::collections::generic::enumerator< type_t > get_enumerator() const =0
Returns an enumerator that iterates through a collection.
Provides a way to represent the current object as a string.
Definition istringable.hpp:22
Provides a set of static methods for querying objects that implement ienumerable <type_t>.
Definition enumerable.hpp:62
Contains xtd::collections::generic::enumerator <type_t> class.
Contains xtd::collections::generic::ienumerable <type_t> interface.
xtd::basic_string< char > string
Represents text as a sequence of UTF-8 code units.
Definition __string_definitions.hpp:43
xtd::sptr< type_t > ptr
The xtd::ptr object is a shared pointer.
Definition ptr.hpp:27
ptr< type_t > new_ptr(args_t &&... args)
The xtd::new_ptr operator creates a xtd::ptr object.
Definition new_ptr.hpp:24
@ current
Specifies the current position within a stream.
Definition seek_origin.hpp:20
Contains xtd::istringable interface.
Provides classes and interfaces that support queries that use Language-Integrated Query (LINQ).
Definition enumerable.hpp:45
string to_string() const noexcept override
Returns the string representation of this xtd::read_only_span <type_t> object.
Definition read_only_span.hpp:375
constexpr const_pointer data() const noexcept
Gets direct access to the underlying contiguous storage.
Definition read_only_span.hpp:201
static auto create(const collection_t &items, const version_t *current_version=nullptr) noexcept
Create an enumerator from specified collection and version.
Definition enumerator.hpp:114