xtd 0.2.0
__enumerable_collection.hpp
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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#include <vector>
15
17namespace xtd::linq {
18 class enumerable;
19};
20
21template<class type_t, class param_t>
22struct __opaque_xtd_linq_lazy_enumerable__ : xtd::collections::generic::ienumerable<type_t>, xtd::istringable {
23 xtd::collections::generic::enumerator<type_t> get_enumerator() const override {
24 return {xtd::new_ptr<lazy_enumerator>(data_->params, data_->move_next, data_->reset)};
25 }
26
27 xtd::string to_string() const override;
28
29private:
30 friend class xtd::linq::enumerable;
31 using param_type = param_t;
32 using move_next_type = std::function<bool(param_type&)>;
33 using reset_type = std::function<void(param_type&)>;
34
35 __opaque_xtd_linq_lazy_enumerable__() = default;
36 __opaque_xtd_linq_lazy_enumerable__(__opaque_xtd_linq_lazy_enumerable__&&) = default;
37 __opaque_xtd_linq_lazy_enumerable__(const __opaque_xtd_linq_lazy_enumerable__&) = default;
38 __opaque_xtd_linq_lazy_enumerable__& operator =(const __opaque_xtd_linq_lazy_enumerable__&) = default;
39 __opaque_xtd_linq_lazy_enumerable__(const param_type& params, move_next_type move_next, reset_type reset) {
40 data_->params = params;
41 data_->move_next = move_next;
42 data_->reset = reset;
43 }
44
45 struct lazy_enumerator : xtd::collections::generic::ienumerator<type_t> {
46 lazy_enumerator(param_type& params, move_next_type& move_next, reset_type& reset) : params_ {params}, move_next_ {move_next}, reset_ {reset} {}
47
48 const type_t& current() const override {
49 return std::get<0>(params_);
50 }
51 bool move_next() override {
52 return move_next_(params_);
53 }
54 void reset() override {
55 reset_(params_);
56 }
57
58 private:
59 param_type& params_;
60 move_next_type& move_next_;
61 reset_type& reset_;
62 };
63
64 struct data {
65 param_type params;
66 move_next_type move_next;
67 reset_type reset;
68 };
69
70 mutable xtd::ptr<data> data_ = xtd::new_ptr<data>();
71};
72
73template<class type_t>
74struct __opaque_xtd_linq_enumerable_collection__ : xtd::collections::generic::ienumerable<type_t>, xtd::istringable {
75 xtd::collections::generic::enumerator<type_t> get_enumerator() const override {
77 }
78
79 xtd::string to_string() const override;
80
81private:
82 friend class xtd::linq::enumerable;
83 __opaque_xtd_linq_enumerable_collection__() = default;
84 std::vector<type_t> items;
85};
Exposes the enumerator, which supports a simple iteration over a collection of a specified type.
Definition ienumerable.hpp:36
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:58
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:41
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 vertion_t *current_version=nullptr) noexcept
Create an enumerator from specified collection and version.
Definition enumerator.hpp:114