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book: reword generic lambda

Fixes #242

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- en-us
  - 03-runtime.md
- zh-cn
  - 03-runtime.md

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`‎book/en-us/03-runtime.md‎`

Lines changed: 6 additions & 10 deletions

Original file line number	Diff line number	Diff line change
`@@ -126,13 +126,9 @@ initialize it in the expression.`
`126`	`126`
`127`	`127`	In the previous section, we mentioned that the `auto` keyword cannot be used
`128`	`128`	`in the parameter list because it would conflict with the functionality of the template.`
`129`		`-But Lambda expressions are not ordinary functions, so Lambda expressions are not templated.`
`130`		`-This has caused us some trouble: the parameter table cannot be generalized,`
`131`		`-and the parameter table type must be clarified.`
`132`		`-`
`133`		`-Fortunately, this trouble only exists in C++11, starting with C++14.`
`134`		-The formal parameters of the Lambda function can use the `auto` keyword
`135`		`-to generate generic meanings:`
	`129`	`+But lambda expressions are not regular functions, without further specification on the typed parameter list, lambda expressions cannot utilize templates. Fortunately, this trouble`
	`130`	`+only exists in C++11, starting with C++14. The formal parameters of the lambda function`
	`131`	+can use the `auto` keyword to utilize template generics:
`136`	`132`
`137`	`133`	```cpp
`138`	`134`	`void lambda_generic() {`
`@@ -221,7 +217,7 @@ int foo(int a, int b, int c) {`
`221`	`217`	`;`
`222`	`218`	`}`
`223`	`219`	`int main() {`
`224`		`- // bind parameter 1, 2 on function foo,`
	`220`	`+ // bind parameter 1, 2 on function foo,`
`225`	`221`	`// and use std::placeholders::_1 as placeholder for the first parameter.`
`226`	`222`	`auto bindFoo = std::bind(foo, std::placeholders::_1, 1,2);`
`227`	`223`	`// when call bindFoo, we only need one param left`
`@@ -483,8 +479,8 @@ int main() {`
`483`	`479`	`// "str: Hello world."`
`484`	`480`	`std::cout << "str: " << str << std::endl;`
`485`	`481`
`486`		`- // use push_back(const T&&),`
`487`		`- // no copy the string will be moved to vector,`
	`482`	`+ // use push_back(const T&&),`
	`483`	`+ // no copy the string will be moved to vector,`
`488`	`484`	`// and therefore std::move can reduce copy cost`
`489`	`485`	`v.push_back(std::move(str));`
`490`	`486`	`// str is empty now`

`‎book/zh-cn/03-runtime.md‎`

Lines changed: 3 additions & 5 deletions

Original file line number	Diff line number	Diff line change
`@@ -107,11 +107,9 @@ void lambda_expression_capture() {`
`107`	`107`	`### 泛型 Lambda`
`108`	`108`
`109`	`109`	上一节中我们提到了 `auto` 关键字不能够用在参数表里,这是因为这样的写法会与模板的功能产生冲突。
`110`		`-但是 Lambda 表达式并不是普通函数,所以 Lambda 表达式并不能够模板化。`
`111`		`-这就为我们造成了一定程度上的麻烦:参数表不能够泛化,必须明确参数表类型。`
`112`		`-`
`113`		`-幸运的是,这种麻烦只存在于 C++11 中,从 C++14 开始,`
`114`		-Lambda 函数的形式参数可以使用 `auto` 关键字来产生意义上的泛型:
	`110`	`+但是 Lambda 表达式并不是普通函数,所以在没有明确指明参数表类型的情况下,Lambda 表达式并不能够模板化。`
	`111`	+幸运的是,这种麻烦只存在于 C++11 中,从 C++14 开始,Lambda 函数的形式参数可以使用 `auto`
	`112`	`+关键字来产生意义上的泛型:`
`115`	`113`
`116`	`114`	```cpp
`117`	`115`	`auto add = [](auto x, auto y) {`

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`‎book/en-us/03-runtime.md‎`

`‎book/zh-cn/03-runtime.md‎`

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