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fix: 实用小技巧中的一些错误 #90

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fix: 实用小技巧中的一些错误 #90

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22 changes: 21 additions & 1 deletion docs/cpp_tricks.md
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Original file line number Diff line number Diff line change
Expand Up @@ -397,8 +397,11 @@ void babysitter(Baby *baby) {
```

这个函数有很多层嵌套，很不美观。用**提前返回**的写法来优化：
鉴于多return违反了单一出口原则，我们尽可能采用do while(0) +break的方式来打断分支。
注:但这种方法对于涉及到内层有多重循环的时候并不好用。

```cpp
/*return版*/
void babysitter(Baby *baby) {
if (!baby->is_alive()) {
puts("宝宝已经去世了");
Expand All @@ -413,6 +416,23 @@ void babysitter(Baby *baby) {
puts("正在调教宝宝...");
puts("正在安抚宝宝...");
}
/*do while版*/
void babysitter(Baby *baby) {
do{
if (!baby->is_alive()) {
puts("宝宝已经去世了");
break;
}
puts("正在检查宝宝喂食情况...");
if (baby->is_feeded()) {
puts("宝宝已经喂食过了");
break;
}
puts("正在喂食宝宝...");
puts("正在调教宝宝...");
puts("正在安抚宝宝...");
}while(0);
}
```

## 立即调用的 Lambda
Expand Down Expand Up @@ -608,7 +628,7 @@ void calc_average() {
void calc_average() {
int res = 0;
int count = 0;
auto cihou = [&] { // 局部 Lambda 的好处：自动帮你捕获 res 和 count！
auto cihou = [&](auto const& arr ) { // 局部 Lambda 的好处：自动帮你捕获 res 和 count！
for (int i = 0; i < arr.size(); i++) {
res += arr[i].age;
count += arr[i].count;
Expand Down