[355] - Did you know that C++20 added constinit keyword?

README.md

@@ -73,6 +73,7 @@
 
 > C++20
 
+* [Did you know that C++20 added constinit keyword?](https://github.com/tip-of-the-week/cpp/blob/master/tips/355.md)
 * [Did you know about C++20 `std::next_permutation` algorithm?](https://github.com/tip-of-the-week/cpp/blob/master/tips/338.md)
 * [Did you know that C++20 added `std::span`?](https://github.com/tip-of-the-week/cpp/blob/master/tips/333.md)
 * [Did you know that with C++20 you can pass concepts?](https://github.com/tip-of-the-week/cpp/blob/master/tips/317.md)

tips/354.md

@@ -33,4 +33,20 @@ static_assert(&b.data[42] == std::string_view{b}.end());
 </p></details>
 
 </p></details><details><summary>Solutions</summary><p>
+
+```cpp
+template <auto N>
+struct buffer {
+    constexpr buffer() {}
+    constexpr char const* begin() const { return data; }
+    constexpr char const* end() const { return data + N; }
+    constexpr operator std::basic_string_view<char>() const {
+        return std::basic_string_view<char>(begin(), end());
+    }
+    char data[N]{};
+};
+```
+
+> https://godbolt.org/z/1cY8enTqc
+
 </p></details>

tips/355.md

@@ -0,0 +1,28 @@
+<details open><summary>Info</summary><p>
+
+* **Did you know that C++20 added constinit keyword?**
+
+  * https://wg21.link/P1143
+
+</p></details><details open><summary>Example</summary><p>
+
+```cpp
+constinit static auto i = 42;
+```
+
+> https://godbolt.org/z/8xWqf9vE8
+
+</p></details><details open><summary>Puzzle</summary><p>
+
+* **Can you implement example showing constinit with thread_local storage?**
+
+```cpp
+extern constinit thread_local int var;
+```
+
+> https://godbolt.org/z/zznznchEE
+
+</p></details>
+
+</p></details><details><summary>Solutions</summary><p>
+</p></details>