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用 bool 泛左值访问 char 变量是未定义行为 #74

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#80
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用 bool 泛左值访问 char 变量是未定义行为#74
#80
@frederick-vs-ja

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@frederick-vs-ja
frederick-vs-ja
opened on Dec 31, 2024

cppguidebook/docs/undef.md

Lines 256 to 269 in 8119e85

```cpp
char c = 0;
bool b = *(bool *)&c; // 可以，b = false
```
```cpp
char c = 1;
bool b = *(bool *)&c; // 可以，b = true
```
```cpp
char c = 2;
bool b = *(bool *)&c; // 未定义行为
```

这里“可以”的代码实际上也是错误的，应该换别的写法。

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