Movatterモバイル変換

[0]ホーム
URL:

Skip to content

Navigation Menu

Sign in
Appearance settings

Search code, repositories, users, issues, pull requests...

Provide feedback

We read every piece of feedback, and take your input very seriously.

Saved searches

Use saved searches to filter your results more quickly

 Sign up
Appearance settings

Commit6238d66

Browse files
committed
book: translate ch03
seechangkun#12
1 parent09537ae commit6238d66

15 files changed

+808
-180
lines changed

‎book/en-us/03-runtime.md

Lines changed: 605 additions & 0 deletions
Large diffs are not rendered by default.

‎book/en-us/toc.md

Lines changed: 3 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -42,17 +42,13 @@
4242
-[**Chapter 03 Language Runtime Enhancements**](./03-runtime.md)
4343
+ 3.1 Lambda expression
4444
+ Basics
45-
+ Value capture
46-
+ Reference capture
47-
+ Implicit capture
48-
+ Expression capture
49-
+ Generic lambda
45+
+ Generics
5046
+ 3.2 Function object wrapper
5147
+ std::function
5248
+ std::bind/std::placeholder
5349
+ 3.3 rvalue reference
5450
+ lvalue, rvalue, prvalue, xvalue
55-
+ rvalue reference& lvalue reference
51+
+ rvalue referenceand lvalue reference
5652
+ Move semantics
5753
+ Perfect forwarding
5854
-[**Chapter 04 Containers**](./04-containers.md)
@@ -87,7 +83,7 @@
8783
+ 7.4 Condition Variable
8884
+ 7.5 Atomic Operation and Memory Model
8985
+ Atomic Operation
90-
+Concistency Model
86+
+Consistency Model
9187
+ Memory Orders
9288
-[**Chapter 08 File System**](./08-filesystem.md)
9389
+ 8.1 Documents and links

‎book/zh-cn/03-runtime.md

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -317,8 +317,8 @@ void foo() {
317317
}
318318
```
319319
320-
由于 int& 不能引用 double 类型的参数，因此必须产生一个临时值来保存s 的值，
321-
从而当 increase() 修改这个临时值时，从而调用完成后s 本身并没有被修改。
320+
由于`int&` 不能引用`double` 类型的参数，因此必须产生一个临时值来保存`s` 的值，
321+
从而当`increase()` 修改这个临时值时，从而调用完成后`s` 本身并没有被修改。
322322
323323
第二个问题，为什么常量引用允许绑定到非左值？原因很简单，因为 Fortran 需要。
324324

‎book/zh-cn/toc.md

Lines changed: 3 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -41,15 +41,11 @@
4141
- 强类型枚举
4242
-[**第 3 章 语言运行期的强化**](./03-runtime.md)
4343
+ 3.1 lambda 表达式
44-
+ lambda 表达式基础
45-
+ 值捕获
46-
+ 引用捕获
47-
+ 隐式捕获
48-
+ 表达式捕获
49-
+ 泛型 lambda
44+
+ 基础
45+
+ 泛型
5046
+ 3.2 函数对象包装器
5147
+ std::function
52-
+ std::bind/std::placeholder
48+
+ std::bind 和std::placeholder
5349
+ 3.3 右值引用
5450
+ 左值、右值的纯右值、将亡值、右值
5551
+ 右值引用和左值引用

‎code/3/3.1.cpp

Lines changed: 0 additions & 55 deletions
This file was deleted.

‎code/3/3.1.lambda.basic.cpp

Lines changed: 61 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,61 @@
1+
//
2+
// 3.1.lambda.basic.cpp
3+
// chapter 03 runtime enhancement
4+
// modern c++ tutorial
5+
//
6+
// created by changkun at changkun.de
7+
// https://github.com/changkun/modern-cpp-tutorial
8+
//
9+
10+
11+
#include<iostream>
12+
#include<utility>
13+
14+
voidlambda_value_capture() {
15+
int value =1;
16+
auto copy_value = [value] {
17+
return value;
18+
};
19+
value =100;
20+
auto stored_value =copy_value();
21+
std::cout <<"stored_value =" << stored_value << std::endl;
22+
// At this moment, stored_value == 1, and value == 100.
23+
// Because copy_value has copied when its was created.
24+
}
25+
26+
voidlambda_reference_capture() {
27+
int value =1;
28+
auto copy_value = [&value] {
29+
return value;
30+
};
31+
value =100;
32+
auto stored_value =copy_value();
33+
std::cout <<"stored_value =" << stored_value << std::endl;
34+
// At this moment, stored_value == 100, value == 100.
35+
// Because copy_value stores reference
36+
}
37+
38+
voidlambda_expression_capture() {
39+
auto important = std::make_unique<int>(1);
40+
auto add = [v1 =1, v2 =std::move(important)](int x,int y) ->int {
41+
return x+y+v1+(*v2);
42+
};
43+
std::cout <<add(3,4) << std::endl;
44+
}
45+
46+
voidlambda_generic() {
47+
auto generic = [](auto x,auto y) {
48+
return x+y;
49+
};
50+
51+
std::cout <<generic(1,2) << std::endl;
52+
std::cout <<generic(1.1,2.2) << std::endl;
53+
}
54+
55+
intmain() {
56+
lambda_value_capture();
57+
lambda_reference_capture();
58+
lambda_expression_capture();
59+
lambda_generic();
60+
return0;
61+
}
Lines changed: 14 additions & 15 deletions
Original file line numberDiff line numberDiff line change
@@ -1,16 +1,16 @@
11
//
2-
// 3.2.cpp
2+
// 3.2.function.wrap.cpp
3+
// chapter 03 runtime enhancement
34
// modern c++ tutorial
45
//
56
// created by changkun at changkun.de
67
// https://github.com/changkun/modern-cpp-tutorial
78
//
8-
// std::function std::bind
99

1010
#include<functional>
1111
#include<iostream>
1212

13-
using foo =void(int);//定义函数指针
13+
using foo =void(int);//function pointer
1414
voidfunctional(foo f) {
1515
f(1);
1616
}
@@ -24,29 +24,28 @@ int foo3(int a, int b, int c) {
2424
}
2525

2626
intmain() {
27-
27+
2828
auto f = [](int value) {
2929
std::cout << value << std::endl;
3030
};
31-
functional(f);//函数指针调用
32-
f(1);// lambda表达式调用
33-
34-
// std::function包装了一个返回值为int, 参数为int的函数
31+
functional(f);//call by function pointer
32+
f(1);//call bylambdaexpression
33+
34+
// std::functionwraps a function that takeint paremeter and returnsintvalue
3535
std::function<int(int)> func = foo2;
36-
36+
3737
int important =10;
3838
std::function<int(int)> func2 = [&](int value) ->int {
3939
return1+value+important;
4040
};
4141
std::cout <<func(10) << std::endl;
4242
std::cout <<func2(10) << std::endl;
43-
44-
45-
//将参数1,2绑定到函数 foo 上，但是使用 std::placeholders::_1 来对第一个参数进行占位
43+
44+
// bind parameter 1, 2 on function foo, and use std::placeholders::_1 as placeholder
45+
//for the first parameter.
4646
auto bindFoo =std::bind(foo3, std::placeholders::_1,1,2);
47-
//这时调用bindFoo 时，只需要提供第一个参数即可
47+
//when callbindFoo, we only need one param left
4848
bindFoo(1);
49-
50-
49+
5150
return0;
5251
}

‎code/3/3.3.cpp

Lines changed: 0 additions & 39 deletions
This file was deleted.

‎code/3/3.3.rvalue.cpp

Lines changed: 38 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,38 @@
1+
//
2+
// 3.3.rvalue.cpp
3+
// modern c++ tutorial
4+
//
5+
// created by changkun at changkun.de
6+
// https://github.com/changkun/modern-cpp-tutorial
7+
//
8+
9+
10+
#include<iostream>
11+
#include<string>
12+
13+
voidreference(std::string& str) {
14+
std::cout <<"lvalue" << std::endl;
15+
}
16+
voidreference(std::string&& str) {
17+
std::cout <<"rvalue" << std::endl;
18+
}
19+
20+
intmain()
21+
{
22+
std::string lv1 ="string,";// lv1 is a lvalue
23+
// std::string&& r1 = s1; // illegal, rvalue can't ref to lvalue
24+
std::string&& rv1 =std::move(lv1);// legal, std::move can convert lvalue to rvalue
25+
std::cout << rv1 << std::endl;// string,
26+
27+
const std::string& lv2 = lv1 + lv1;// legal, const lvalue reference can extend temp variable's lifecycle
28+
// lv2 += "Test"; // illegal, const ref can't be modified
29+
std::cout << lv2 << std::endl;// string,string
30+
31+
std::string&& rv2 = lv1 + lv2;// legal, rvalue ref extend lifecycle
32+
rv2 +="string";// legal, non-const reference can be modified
33+
std::cout << rv2 << std::endl;// string,string,string,
34+
35+
reference(rv2);// output: lvalue
36+
37+
return0;
38+
}

‎code/3/3.4.historical.cpp

Lines changed: 16 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,16 @@
1+
//
2+
// 3.4.historical.cpp
3+
// modern c++ tutorial
4+
//
5+
// created by changkun at changkun.de
6+
// https://github.com/changkun/modern-cpp-tutorial
7+
//
8+
9+
#include<iostream>
10+
11+
intmain() {
12+
// int &a = std::move(1); // illegal, non-const lvalue reference cannot ref rvalue
13+
constint &b =std::move(1);// legal, const lvalue reference can
14+
15+
std::cout << b << std::endl;
16+
}

‎code/3/3.4.cpprenamed to‎code/3/3.5.move.semantics.cpp

Lines changed: 9 additions & 10 deletions
Original file line numberDiff line numberDiff line change
@@ -1,36 +1,35 @@
11
//
2-
// 3.4.cpp
2+
// 3.5.move.semantics.cpp
33
// modern c++ tutorial
44
//
55
// created by changkun at changkun.de
66
// https://github.com/changkun/modern-cpp-tutorial
77
//
8-
// 移动语义
98

109
#include<iostream>
1110
classA {
1211
public:
1312
int *pointer;
1413
A():pointer(newint(1)) {
15-
std::cout <<"构造" << pointer << std::endl;
14+
std::cout <<"construct" << pointer << std::endl;
1615
}
1716
A(A& a):pointer(newint(*a.pointer)) {
18-
std::cout <<"拷贝" << pointer << std::endl;
19-
}//无意义的对象拷贝
17+
std::cout <<"copy" << pointer << std::endl;
18+
}//meaningless object copy
2019
A(A&& a):pointer(a.pointer) {
2120
a.pointer =nullptr;
22-
std::cout <<"移动" << pointer << std::endl;
21+
std::cout <<"move" << pointer << std::endl;
2322
}
2423
~A(){
25-
std::cout <<"析构" << pointer << std::endl;
24+
std::cout <<"destruct" << pointer << std::endl;
2625
delete pointer;
2726
}
2827
};
29-
//防止编译器优化
28+
//avoid compiler optimization
3029
Areturn_rvalue(bool test) {
3130
A a,b;
32-
if(test)return a;//等价于 static_cast<A&&>(a);
33-
elsereturn b;//等价于 static_cast<A&&>(b);
31+
if(test)return a;//equal to static_cast<A&&>(a);
32+
elsereturn b;//equal to static_cast<A&&>(b);
3433
}
3534
intmain() {
3635
A obj =return_rvalue(false);

0 commit comments

Comments
 (0)
[8]ページ先頭
©2009-2025 Movatter.jp