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Update README.md

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Francis 2022-04-10 17:52:46 +08:00 committed by GitHub
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@ -248,7 +248,7 @@ Welcome to Apple!
**限定访问范围** **限定访问范围**
static还有限定访问范围的作用（类似于匿名名字空间）。来自issue:https://github.com/Light-City/CPlusPlusThings/issues/142 static还有限定访问范围的作用（类似于匿名名字空间）。来自issue:https://github.com/Light-City/CPlusPlusThings/issues/142
```cpp
// source1.cpp // source1.cpp
extern void sayHello(); extern void sayHello();
const char* msg = "Hello World!\n"; const char* msg = "Hello World!\n";
@ -265,8 +265,9 @@ void sayHello()
{ {
printf("%s", msg); printf("%s", msg);
} }
```
g++对于上面两个代码文件是可以正常编译并且打印Hello World!，但如果给source1.cpp中的msg加上static，则会导致undefined reference to 'msg'的编译错误： g++对于上面两个代码文件是可以正常编译并且打印Hello World!，但如果给source1.cpp中的msg加上static，则会导致undefined reference to 'msg'的编译错误：
```cpp
// source1.cpp // source1.cpp
extern void sayHello(); extern void sayHello();
static const char* msg = "Hello World!\n"; static const char* msg = "Hello World!\n";
@ -275,3 +276,4 @@ int main()
sayHello(); sayHello();
return 0; return 0;
} }
```