173

* fix #155
* fix #145

README.md

@@ -29,7 +29,7 @@ RSS使用仓库的release RSS [链接](https://github.com/wanghenshui/cppweeklyn
 ## 2024
 
 
-|   [171](./posts/171.md)                 |    [172](./posts/172.md)                     |                    |                    |  |  |  |  |  |  |
+|   [171](./posts/171.md)                 |    [172](./posts/172.md)                     |    [173](./posts/173.md)                |                    |  |  |  |  |  |  |
 | ------------------ | ------------------ | ------------------ | ------------------ | ------------------ | ------------------ | ------------------ | ------------------ | ------------------ | ------------------ |
 | [161](./posts/161.md) | [162](./posts/162.md) | [163](./posts/163.md) | [164](./posts/164.md) | [165](./posts/165.md) | [166](./posts/166.md) | [167](./posts/167.md) | [168](./posts/168.md) | [169](./posts/169.md) |  [170](./posts/170.md)                  |
 | [151](./posts/151.md) | [152](./posts/152.md) | [153](./posts/153.md) | [154](./posts/154.md) | [155](./posts/155.md) | [156](./posts/156.md) | [157](./posts/157.md) | [158](./posts/158.md) | [159](./posts/159.md) | [160](./posts/160.md) |

posts/115.md

@@ -270,7 +270,7 @@ auto d = map.find<return_value_or_zero>(key);  // Value
 ```
 **优化insert**
 
-insert可能不成功，所以需要推迟value构造
+insert可能不成功，所以需要推迟value构造，惰性构造
 
 ```cpp
 template <class F>
@@ -287,6 +287,8 @@ auto [iter, success] = map.try_emplace(key, LAZY(acquire_value()));
 
 这个思路还是很有用的
 
+有提案 [P3288 std::elide](http://www.virjacode.com/papers/p3288r1.htm) 不知道有没有机会合入，代码还是很简单的 https://godbolt.org/z/rd5qbfE7E
+
 - [Don’t name your header file security.h either](https://devblogs.microsoft.com/oldnewthing/20230524-00/?p=108239)
 
 windows总是有这种稀奇古怪的错误，类似的有 [shouldn’t name your DLL “security.dll](https://devblogs.microsoft.com/oldnewthing/20040702-00/?p=38583)

posts/158.md

@@ -61,6 +61,8 @@ operator new(sizeof(T), type_identity<T>{}, args…)
 
 帮你把optional variant any里的T掏出来。这个很干净
 
+就是一个惰性延迟wrapper
+
 [实现godbolt](https://godbolt.org/z/65fEd3axf)
 
 - [A Relocating Swap](https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2024/p3239r0.pdf)