-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathcpp_primer.cpp
More file actions
67 lines (52 loc) · 925 Bytes
/
Copy pathcpp_primer.cpp
File metadata and controls
67 lines (52 loc) · 925 Bytes
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
// Test.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include <vector>
#include <memory>
#include <string>
#include <unordered_map>
#include <iostream>
class A {
public:
A(const std::string& name)
{
std::cout << name << std::endl;
}
};
int main1()
{
char szTmp[] = "Hello";
A a(std::string(szTmp));
return 0;
}
auto func(int w) -> decltype(w)
{
return w;
}
auto func(double w) -> decltype(w)
{
return w;
}
template <typename T>
auto func(T w) -> decltype(T)
{
int x = 3;
const int cx = x;
const int& fx = cx;
auto ax = fx;
decltype(auto) dx = fx;
return w;
}
int _tmain(int argc, _TCHAR* argv[])
{
//int x = 1;
//int y = 1;
//int z = 1;
//int sum1{ x + y + z };
int &&rr1 = 42; // 正确：字面常量是右值
// int &&rr2 = rr1; // 错误：表达式rr1是左值
int &&rr3 = std::move(rr1); // ok
rr1 = 3;
system("pause");
return 0;
}