cpprefjp · faithandbrave · Feb 17, 2026 · Feb 17, 2026 · Feb 17, 2026 · Feb 17, 2026
diff --git a/reference/deque/deque/append_range.md b/reference/deque/deque/append_range.md
@@ -7,7 +7,11 @@
 
 ```cpp
 template <container-compatible-range<T> R>
-void append_range(R&& rg); // C++23
+void
+  append_range(R&& rg); // (1) C++23
+template <container-compatible-range<T> R>
+constexpr void
+  append_range(R&& rg); // (1) C++26
 ```
 
 ## 概要
@@ -63,3 +67,7 @@ int main()
 |-------------------------------------------|----------------------|
 | [`push_back`](push_back.md)               | 末尾に要素を追加する         |
 | [`emplace_back`](emplace_back.md)         | 末尾に要素を直接構築で追加する |
+
+
+## 参照
+- [P3372R3 constexpr containers and adaptors](https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3372r3.html)
diff --git a/reference/deque/deque/assign.md b/reference/deque/deque/assign.md
@@ -6,11 +6,21 @@
 
 ```cpp
 template <class InputIterator>
-void assign(InputIterator first, InputIterator last); // (1)
-
-void assign(size_type n, const T& t);                 // (2)
-
-void assign(initializer_list<T> init);                // (3) C++11
+void
+  assign(InputIterator first, InputIterator last); // (1) C++03
+template <class InputIterator>
+constexpr void
+  assign(InputIterator first, InputIterator last); // (1) C++26
+
+void
+  assign(size_type n, const T& t);                 // (2) C++03
+constexpr void
+  assign(size_type n, const T& t);                 // (2) C++26
+
+void
+  assign(initializer_list<T> init);                // (3) C++11
+constexpr void
+  assign(initializer_list<T> init);                // (3) C++26
 ```
 * initializer_list[link /reference/initializer_list/initializer_list.md]
 
@@ -73,3 +83,4 @@ c3 : {1 2 3 }
 
 ## 参照
 - [N2679 Initializer Lists for Standard Containers(Revision 1)](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2679.pdf)
+- [P3372R3 constexpr containers and adaptors](https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3372r3.html)
diff --git a/reference/deque/deque/assign_range.md b/reference/deque/deque/assign_range.md
@@ -7,7 +7,11 @@
 
 ```cpp
 template <container-compatible-range<T> R>
-void assign_range(R&& rg); // C++23
+void
+  assign_range(R&& rg); // (1) C++23
+template <container-compatible-range<T> R>
+constexpr void
+  assign_range(R&& rg); // (1) C++26
 ```
 
 ## 概要
@@ -62,3 +66,7 @@ int main()
 | 名前                                      | 説明                  |
 |-------------------------------------------|----------------------|
 | [`assign`](assign.md)                     | コンテナに値を代入する   |
+
+
+## 参照
+- [P3372R3 constexpr containers and adaptors](https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3372r3.html)
diff --git a/reference/deque/deque/at.md b/reference/deque/deque/at.md
@@ -5,8 +5,15 @@
 * function[meta id-type]
 
 ```cpp
-reference at(size_type n);
-const_reference at(size_type n) const;
+reference
+  at(size_type n);           // (1) C++03
+constexpr
+  reference at(size_type n); // (1) C++26
+
+const_reference
+  at(size_type n) const;     // (2) C++03
+constexpr const_reference
+  at(size_type n) const;     // (2) C++26
 ```
 
 ## 概要
@@ -68,3 +75,7 @@ out of range!
 | 名前 | 説明 |
 |----------------------------|----------------------------------|
 | [`operator[]`](op_at.md) | 任意位置の要素への参照を取得する |
+
+
+## 参照
+- [P3372R3 constexpr containers and adaptors](https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3372r3.html)
diff --git a/reference/deque/deque/back.md b/reference/deque/deque/back.md
@@ -5,8 +5,15 @@
 * function[meta id-type]
 
 ```cpp
-reference back();
-const_reference back() const;
+reference
+  back();           // (1) C++03
+constexpr reference
+  back();           // (1) C++26
+
+const_reference
+  back() const;           // (2) C++03
+constexpr const_reference
+  back() const;           // (2) C++26
 ```
 
 ## 概要
@@ -53,3 +60,7 @@ int main()
 | [`front`](front.md)         | 先頭要素への参照を取得する |
 | [`push_back`](push_back.md) | 末尾に要素を追加する |
 | [`pop_back`](pop_back.md)   | 末尾要素を削除する |
+
+
+## 参照
+- [P3372R3 constexpr containers and adaptors](https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3372r3.html)
diff --git a/reference/deque/deque/begin.md b/reference/deque/deque/begin.md
@@ -5,11 +5,13 @@
 * function[meta id-type]
 
 ```cpp
-iterator begin();           // (1) C++03
-iterator begin() noexcept;  // (1) C++11
+iterator begin();                    // (1) C++03
+iterator begin() noexcept;           // (1) C++11
+constexpr iterator begin() noexcept; // (1) C++26
 
-const_iterator begin() const;           // (2) C++03
-const_iterator begin() const noexcept;  // (2) C++11
+const_iterator begin() const;                    // (2) C++03
+const_iterator begin() const noexcept;           // (2) C++11
+constexpr const_iterator begin() const noexcept; // (2) C++26
 ```
 
 ## 概要
@@ -63,3 +65,7 @@ int main()
 | [`cend`](cend.md)     | 末尾要素を指す読み取り専用イテレータを取得する |
 | [`rbegin`](rbegin.md) | 末尾要素を指す逆イテレータを取得する |
 | [`rend`](rend.md)     | 先頭要素の前を指す逆イテレータを取得する |
+
+
+## 参照
+- [P3372R3 constexpr containers and adaptors](https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3372r3.html)
diff --git a/reference/deque/deque/cbegin.md b/reference/deque/deque/cbegin.md
@@ -6,7 +6,8 @@
 * cpp11[meta cpp]
 
 ```cpp
-const_iterator cbegin() const noexcept;
+const_iterator cbegin() const noexcept;           // (1) C++11
+constexpr const_iterator cbegin() const noexcept; // (1) C++26
 ```
 
 ## 概要
@@ -67,3 +68,4 @@ int main()
 - [Visual C++](/implementation.md#visual_cpp): 2010 [mark verified], 2012 [mark verified], 2013 [mark verified]
 
 ## 参照
+- [P3372R3 constexpr containers and adaptors](https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3372r3.html)
diff --git a/reference/deque/deque/cend.md b/reference/deque/deque/cend.md
@@ -6,7 +6,8 @@
 * cpp11[meta cpp]
 
 ```cpp
-const_iterator cend() const noexcept;
+const_iterator cend() const noexcept;           // (1) C++11
+constexpr const_iterator cend() const noexcept; // (1) C++26
 ```
 
 ## 概要
@@ -71,3 +72,4 @@ int main()
 
 
 ## 参照
+- [P3372R3 constexpr containers and adaptors](https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3372r3.html)
diff --git a/reference/deque/deque/clear.md b/reference/deque/deque/clear.md
@@ -5,8 +5,9 @@
 * function[meta id-type]
 
 ```cpp
-void clear();           // C++03
-void clear() noexcept;  // C++11
+void clear();                    // (1) C++03
+void clear() noexcept;           // (1) C++11
+constexpr void clear() noexcept; // (1) C++26
 ```
 
 ## 概要
@@ -58,11 +59,6 @@ int main()
 ```
 ```
 
-## 参照
-- [LWG Issue 2231. DR 704 removes complexity guarantee for `clear()`](http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2231)
-    - C++03までこの関数の効果は`erase(begin(), end())`だったため、それによって線形時間の計算量が保証されていたが、C++11で効果の表記が変わったために、保証がなくなってしまっていた。C++14であらためて保証を追加。
-
-
 ## 関連項目
 
 | 名前 | 説明 |
@@ -72,3 +68,9 @@ int main()
 | [`pop_back`](pop_back.md)   | 末尾要素を削除する |
 | [`pop_front`](pop_front.md) | 先頭要素を削除する |
 | [`empty`](empty.md)         | コンテナが空であるかどうかを調べる |
+
+
+## 参照
+- [LWG Issue 2231. DR 704 removes complexity guarantee for `clear()`](http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2231)
+    - C++03までこの関数の効果は`erase(begin(), end())`だったため、それによって線形時間の計算量が保証されていたが、C++11で効果の表記が変わったために、保証がなくなってしまっていた。C++14であらためて保証を追加。
+- [P3372R3 constexpr containers and adaptors](https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3372r3.html)
diff --git a/reference/deque/deque/crbegin.md b/reference/deque/deque/crbegin.md
@@ -6,7 +6,8 @@
 * cpp11[meta cpp]
 
 ```cpp
-const_reverse_iterator crbegin() const noexcept;
+const_reverse_iterator crbegin() const noexcept;           // (1) C++11
+constexpr const_reverse_iterator crbegin() const noexcept; // (1) C++26
 ```
 
 ## 概要
@@ -67,3 +68,4 @@ int main()
 
 
 ## 参照
+- [P3372R3 constexpr containers and adaptors](https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3372r3.html)
diff --git a/reference/deque/deque/crend.md b/reference/deque/deque/crend.md
@@ -6,7 +6,8 @@
 * cpp11[meta cpp]
 
 ```cpp
-const_reverse_iterator crend() const noexcept;
+const_reverse_iterator crend() const noexcept;           // (1) C++11
+constexpr const_reverse_iterator crend() const noexcept; // (1) C++26
 ```
 
 ## 概要
@@ -67,3 +68,4 @@ int main()
 
 
 ## 参照
+- [P3372R3 constexpr containers and adaptors](https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3372r3.html)
diff --git a/reference/deque/deque/emplace.md b/reference/deque/deque/emplace.md
@@ -7,7 +7,9 @@
 
 ```cpp
 template <class... Args>
-iterator emplace(const_iterator position, Args&&... args);
+iterator emplace(const_iterator position, Args&&... args);           // (1) C++11
+template <class... Args>
+constexpr iterator emplace(const_iterator position, Args&&... args); // (1) C++26
 ```
 
 ## 概要
@@ -85,3 +87,4 @@ int main()
 - [N2345 Placement Insert for Containers (Revision 2)](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2345.pdf)
 - [LWG Issue 2252. Strong guarantee on `vector::push_back()` still broken with C++11?](http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2252)
     - 経緯の説明は、[`vector::push_back()`](/reference/vector/vector/push_back.md)ページを参照。
+- [P3372R3 constexpr containers and adaptors](https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3372r3.html)
diff --git a/reference/deque/deque/emplace_back.md b/reference/deque/deque/emplace_back.md
@@ -7,10 +7,11 @@
 
 ```cpp
 template <class... Args>
-void emplace_back(Args&&... args);      // C++14 まで
-
+void emplace_back(Args&&... args);                // (1) C++11
+template <class... Args>
+reference emplace_back(Args&&... args);           // (1) C++17
 template <class... Args>
-reference emplace_back(Args&&... args); // C++17 から
+constexpr reference emplace_back(Args&&... args); // (1) C++26
 ```
 
 ## 概要
@@ -94,3 +95,4 @@ int main()
 - [P0084R0 Emplace Return Type](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0084r0.pdf)
 - [P0084R1 Emplace Return Type (Revision 1)](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0084r1.pdf)
 - [P0084R2 Emplace Return Type (Revision 2)](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0084r2.pdf)
+- [P3372R3 constexpr containers and adaptors](https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3372r3.html)
diff --git a/reference/deque/deque/emplace_front.md b/reference/deque/deque/emplace_front.md
@@ -7,10 +7,11 @@
 
 ```cpp
 template <class... Args>
-void emplace_front(Args&&... args);         // C++14 まで
-
+void emplace_front(Args&&... args);                // (1) C++11
+template <class... Args>
+reference emplace_front(Args&&... args);           // (1) C++17
 template <class... Args>
-reference emplace_front(Args&&... args);    // C++17 から
+constexpr reference emplace_front(Args&&... args); // (1) C++26
 ```
 
 ## 概要
@@ -94,3 +95,4 @@ int main()
 - [P0084R0 Emplace Return Type](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0084r0.pdf)
 - [P0084R1 Emplace Return Type (Revision 1)](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0084r1.pdf)
 - [P0084R2 Emplace Return Type (Revision 2)](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0084r2.pdf)
+- [P3372R3 constexpr containers and adaptors](https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3372r3.html)
diff --git a/reference/deque/deque/empty.md b/reference/deque/deque/empty.md
@@ -5,10 +5,10 @@
 * function[meta id-type]
 
 ```cpp
-bool empty() const;                        // C++03
-bool empty() const noexcept;               // C++11
-[[nodiscard]] bool empty() const noexcept; // C++20
-bool empty() const noexcept;               // C++26
+bool empty() const;                        // (1) C++03
+bool empty() const noexcept;               // (1) C++11
+[[nodiscard]] bool empty() const noexcept; // (1) C++20
+constexpr bool empty() const noexcept;     // (1) C++26
 ```
 
 ## 概要
@@ -70,3 +70,4 @@ false
     - C++20で`[[nodiscard]]`が付加された
 - [P2422R1 Remove `nodiscard` annotations from the standard library specification](https://open-std.org/jtc1/sc22/wg21/docs/papers/2024/p2422r1.html)
     - C++26で`[[nodiscard]]`指定が削除された
+- [P3372R3 constexpr containers and adaptors](https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3372r3.html)
diff --git a/reference/deque/deque/end.md b/reference/deque/deque/end.md
@@ -5,11 +5,13 @@
 * function[meta id-type]
 
 ```cpp
-iterator end();           // (1) C++03
-iterator end() noexcept;  // (1) C++11
+iterator end();                    // (1) C++03
+iterator end() noexcept;           // (1) C++11
+constexpr iterator end() noexcept; // (1) C++26
 
-const_iterator end() const;           // (2) C++03
-const_iterator end() const noexcept;  // (2) C++11
+const_iterator end() const;                    // (2) C++03
+const_iterator end() const noexcept;           // (2) C++11
+constexpr const_iterator end() const noexcept; // (2) C++26
 ```
 
 ## 概要
@@ -80,3 +82,7 @@ int main()
 | [`cend`](cend.md)     | 末尾要素の次を指す読み取り専用イテレータを取得する |
 | [`rbegin`](rbegin.md) | 末尾要素を指す逆イテレータを取得する |
 | [`rend`](rend.md)     | 先頭要素の前を指す逆イテレータを取得する |
+
+
+## 参照
+- [P3372R3 constexpr containers and adaptors](https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3372r3.html)
diff --git a/reference/deque/deque/erase.md b/reference/deque/deque/erase.md
@@ -7,9 +7,11 @@
 ```cpp
 iterator erase(iterator position);                         // (1) C++03
 iterator erase(const_iterator position);                   // (1) C++11
+constexpr iterator erase(const_iterator position);         // (1) C++26
 
-iterator erase(iterator first, iterator last);             // (2) C++03
-iterator erase(const_iterator first, const_iterator last); // (2) C++11
+iterator erase(iterator first, iterator last);                       // (2) C++03
+iterator erase(const_iterator first, const_iterator last);           // (2) C++11
+constexpr iterator erase(const_iterator first, const_iterator last); // (2) C++26
 ```
 
 ## 概要
@@ -110,3 +112,4 @@ int main()
 ## 参照
 - [N2350 Container insert/erase and iterator constness (Revision 1)](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2350.pdf)
 - [LWG Issue 638. `deque` end invalidation during erase](http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#638)
+- [P3372R3 constexpr containers and adaptors](https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3372r3.html)
diff --git a/reference/deque/deque/erase_free.md b/reference/deque/deque/erase_free.md
@@ -10,7 +10,7 @@ namespace std {
   typename deque<T, Allocator>::size_type
     erase(deque<T, Allocator>& c, const U& value); // (1) C++20
   template <class T, class Allocator, class U = T>
-  typename deque<T, Allocator>::size_type
+  constexpr typename deque<T, Allocator>::size_type
     erase(deque<T, Allocator>& c, const U& value); // (1) C++26
 }
 ```
@@ -117,3 +117,4 @@ int main() {
 - [R1115R3 Improving the Return Value of Erase-Like Algorithms II: Free `erase`/`erase_if`](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1115r3.pdf)
 - [P2248R8 Enabling list-initialization for algorithms](https://open-std.org/jtc1/sc22/wg21/docs/papers/2024/p2248r8.html)
     - C++26で波カッコ初期化 (リスト初期化) に対応した
+- [P3372R3 constexpr containers and adaptors](https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3372r3.html)
diff --git a/reference/deque/deque/erase_if_free.md b/reference/deque/deque/erase_if_free.md
@@ -7,7 +7,11 @@
 ```cpp
 namespace std {
   template <class T, class Allocator, class Predicate>
-  typename deque<T, Allocator>::size_type erase_if(deque<T, Allocator>& c, Predicate pred);
+  typename deque<T, Allocator>::size_type
+    erase_if(deque<T, Allocator>& c, Predicate pred); // (1) C++20
+  template <class T, class Allocator, class Predicate>
+  constexpr typename deque<T, Allocator>::size_type
+    erase_if(deque<T, Allocator>& c, Predicate pred); // (1) C++26
 }
 ```
 
@@ -74,3 +78,4 @@ int main()
 ## 参照
 - [P1209R0 Adopt consistent container erasure from Library Fundamentals 2](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1209r0.html)
 - [R1115R3 Improving the Return Value of Erase-Like Algorithms II: Free `erase`/`erase_if`](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1115r3.pdf)
+- [P3372R3 constexpr containers and adaptors](https://open-std.org/jtc1/sc22/wg21/docs/papers/2025/p3372r3.html)