40 lines
712 B
Markdown
40 lines
712 B
Markdown
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# 存储说明符
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+ static
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+ extern
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+ mutable
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+ thread_local
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# cv 说明符
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+ const
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+ volatile
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## static
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用在整个文件的声明中，表示内部连接性
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局部声明中，代表存储持续性为静态
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可将函数限制为内部连接性
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`static void show();`
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## extern
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引用声明
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声明引用在其他地方定义的变量
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## mutable
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即使结构(类)被声明为const,也可以被修改的成员函数
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```cpp
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struct people {
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int scora;
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mutable int accesses;
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};
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const people demo;
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demo.accesses = 0;
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```
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## const
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const 全局变量的连接性为内部(默认外部)
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就像使用了static
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如果希望连接性为外部，则可以用extern覆盖
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## volatile 强制读内存
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