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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,70 @@ | ||
| # base | ||
| * ranges[meta header] | ||
| * std::ranges[meta namespace] | ||
| * filter_view[meta class] | ||
| * function[meta id-type] | ||
| * cpp20[meta cpp] | ||
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| ```cpp | ||
| constexpr V base() const & requires copy_constructible<V>; // (1) | ||
| constexpr V base() &&; // (2) | ||
| ``` | ||
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| ## 概要 | ||
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| メンバ変数として保持している、元の`view`を取得する。 | ||
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| ## 効果 | ||
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| 入力`view`（`V`）のオブジェクトを`base_`というメンバに保持するとして | ||
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| - (1) : `return base_;` と等しい | ||
| - (2) : `return std::move(base_);` と等しい | ||
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| ## 例 | ||
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| ```cpp example | ||
| #include <ranges> | ||
| #include <vector> | ||
| #include <iostream> | ||
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| int main() { | ||
| using std::ranges::view; | ||
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| std::vector<int> vec = {1, 2, 3, 4, 5}; | ||
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| std::ranges::filter_view fv{vec, [](int i) { return i % 2 == 0; }}; | ||
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| // (1) コピーして取得 | ||
| view auto b1 = fv.base(); | ||
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| // (2) ムーブして取得 | ||
| view auto b2 = std::move(fv).base(); | ||
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| // 得られるのは元のRangeではなく、あくまでview | ||
| static_assert(not std::same_as<decltype(b1), std::vector<int>>); | ||
| static_assert( std::same_as<decltype(b1), std::ranges::ref_view<std::vector<int>>>); | ||
| static_assert( std::same_as<decltype(b2), std::ranges::ref_view<std::vector<int>>>); | ||
| } | ||
| ``` | ||
| * base[color ff0000] | ||
| * filter_view[link ../filter_view.md] | ||
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| ### 出力 | ||
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| ``` | ||
| ``` | ||
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| ## バージョン | ||
| ### 言語 | ||
| - C++20 | ||
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| ### 処理系 | ||
| - [Clang](/implementation.md#clang): 13.0.0 [mark verified] | ||
| - [GCC](/implementation.md#gcc): 10.1.0 [mark verified] | ||
| - [ICC](/implementation.md#icc): ? | ||
| - [Visual C++](/implementation.md#visual_cpp): 2019 Update 10 [mark verified] | ||
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| ## 参照 | ||
| - [N4861 24.7.4 Filter view](https://timsong-cpp.github.io/cppwp/n4861/range.filter) | ||
| - [N4950 26.7.8 Filter view](https://timsong-cpp.github.io/cppwp/n4950/range.filter) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| # begin | ||
| * ranges[meta header] | ||
| * std::ranges[meta namespace] | ||
| * filter_view[meta class] | ||
| * function[meta id-type] | ||
| * cpp20[meta cpp] | ||
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| ```cpp | ||
| constexpr iterator begin(); | ||
| ``` | ||
| * iterator[link iterator.md] | ||
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| ## 概要 | ||
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| `view`の先頭要素を指すイテレータを取得する。 | ||
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| ## 事前条件 | ||
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| `pred_.`[`has_value`](/reference/optional/optional/has_value.md)`()`が`true`であること。 | ||
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| ## 戻り値 | ||
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| `{*this, `[`ranges::find_if`](/reference/algorithm/ranges_find_if.md)`(base_, `[`ref`](/reference/functional/ref.md)`(*pred_))}` | ||
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| [`range`](../range.md)のモデルとなるためにはこの関数が償却定数時間で実行できなければならないため、値はキャッシュされる。 | ||
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| ## 例 | ||
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| ```cpp example | ||
| #include <ranges> | ||
| #include <vector> | ||
| #include <iostream> | ||
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| int main() { | ||
| std::vector<int> vec = {1, 2, 3, 4, 5}; | ||
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| std::ranges::filter_view fv{vec, [](int i) { return i % 2 == 0; }}; | ||
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| auto it = fv.begin(); | ||
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| std::cout << *it << '\n'; | ||
| } | ||
| ``` | ||
| * begin[color ff0000] | ||
| * filter_view[link ../filter_view.md] | ||
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| ### 出力 | ||
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| ``` | ||
| 2 | ||
| ``` | ||
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| ## バージョン | ||
| ### 言語 | ||
| - C++20 | ||
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| ### 処理系 | ||
| - [Clang](/implementation.md#clang): 13.0.0 [mark verified] | ||
| - [GCC](/implementation.md#gcc): 10.1.0 [mark verified] | ||
| - [ICC](/implementation.md#icc): ? | ||
| - [Visual C++](/implementation.md#visual_cpp): 2019 Update 10 [mark verified] | ||
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| ## 参照 | ||
| - [N4861 24.7.4 Filter view](https://timsong-cpp.github.io/cppwp/n4861/range.filter) | ||
| - [N4950 26.7.8 Filter view](https://timsong-cpp.github.io/cppwp/n4950/range.filter) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| # end | ||
| * ranges[meta header] | ||
| * std::ranges[meta namespace] | ||
| * filter_view[meta class] | ||
| * function[meta id-type] | ||
| * cpp23[meta cpp] | ||
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| ```cpp | ||
| constexpr auto end() { | ||
| if constexpr (common_range<V>) | ||
| return iterator{*this, ranges::end(base_)}; | ||
| else | ||
| return sentinel{*this}; | ||
| } | ||
| ``` | ||
| * ranges::end[link ../end.md] | ||
| * iterator[link iterator.md] | ||
| * sentinel[link sentinel.md] | ||
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| ## 概要 | ||
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| 番兵を取得する。 | ||
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| ## 例 | ||
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| ```cpp example | ||
| #include <ranges> | ||
| #include <vector> | ||
| #include <iostream> | ||
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| int main() { | ||
| std::vector<int> vec = {1, 2, 3, 4, 5}; | ||
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| std::ranges::filter_view fv{vec, [](int i) { return i % 2 == 0; }}; | ||
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| auto e = fv.end(); | ||
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| --e; | ||
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| std::cout << *e << '\n'; | ||
| } | ||
| ``` | ||
| * end[color ff0000] | ||
| * filter_view[link ../filter_view.md] | ||
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| ### 出力 | ||
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| ``` | ||
| 4 | ||
| ``` | ||
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| ## バージョン | ||
| ### 言語 | ||
| - C++20 | ||
|
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| ### 処理系 | ||
| - [Clang](/implementation.md#clang): 13.0.0 [mark verified] | ||
| - [GCC](/implementation.md#gcc): 10.1.0 [mark verified] | ||
| - [ICC](/implementation.md#icc): ? | ||
| - [Visual C++](/implementation.md#visual_cpp): 2019 Update 10 [mark verified] | ||
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| ## 参照 | ||
| - [N4861 24.7.4 Filter view](https://timsong-cpp.github.io/cppwp/n4861/range.filter) | ||
| - [N4950 26.7.8 Filter view](https://timsong-cpp.github.io/cppwp/n4950/range.filter) |
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