[已解决]返回数组的引用

我是第一名

1. #include <iostream>
   
2. #include <string>
   
3. using namespace std;
   
4. string (& str(string s))[10];
   
5. 
   
6. typedef string sss[10];
   
7. sss& str1(string s);
   
8. 
   
9. auto str2(string s)->string(&)[10];
   
10. 
    
11. string s1[10];
    
12. decltype(s1)& str3(string s);
    
13. 
    

复制代码

大佬看看是否都是等价的函数声明

最佳答案

月排行榜 / 总排行榜

人造人

2022-1-25 01:32:47

1. $ cat main.cpp
   
2. #include <iostream>
   
3. #include <string>
   
4. 
   
5. //using namespace std;
   
6. using std::string;
   
7. 
   
8. string (&str(string s))[10];
   
9. 
   
10. typedef string sss[10];
    
11. sss &str1(string s);
    
12. 
    
13. auto str2(string s) -> string (&)[10];
    
14. 
    
15. string s1[10];
    
16. decltype(s1) &str3(string s);
    
17. 
    
18. using std::cout, std::endl;
    
19. 
    
20. int main() {
    
21.     cout << typeid(str).name() << endl;
    
22.     cout << typeid(str1).name() << endl;
    
23.     cout << typeid(str2).name() << endl;
    
24.     cout << typeid(str3).name() << endl;
    
25.     return 0;
    
26. }
    
27. $ g++-debug -o main main.cpp
    
28. $ ./main
    
29. FRA10_NSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES4_E
    
30. FRA10_NSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES4_E
    
31. FRA10_NSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES4_E
    
32. FRA10_NSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES4_E
    
33. $ ./main | c++filt -t
    
34. std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > (&(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)) [10]
    
35. std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > (&(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)) [10]
    
36. std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > (&(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)) [10]
    
37. std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > (&(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)) [10]
    
38. $

复制代码

跳转到最佳答案楼层

人造人

是

人造人

1. $ cat main.cpp
   
2. #include <iostream>
   
3. #include <string>
   
4. 
   
5. //using namespace std;
   
6. using std::string;
   
7. 
   
8. string (&str(string s))[10];
   
9. 
   
10. typedef string sss[10];
    
11. sss &str1(string s);
    
12. 
    
13. auto str2(string s) -> string (&)[10];
    
14. 
    
15. string s1[10];
    
16. decltype(s1) &str3(string s);
    
17. 
    
18. using std::cout, std::endl;
    
19. 
    
20. int main() {
    
21.     cout << typeid(str).name() << endl;
    
22.     cout << typeid(str1).name() << endl;
    
23.     cout << typeid(str2).name() << endl;
    
24.     cout << typeid(str3).name() << endl;
    
25.     return 0;
    
26. }
    
27. $ g++-debug -o main main.cpp
    
28. $ ./main
    
29. FRA10_NSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES4_E
    
30. FRA10_NSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES4_E
    
31. FRA10_NSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES4_E
    
32. FRA10_NSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES4_E
    
33. $ ./main | c++filt -t
    
34. std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > (&(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)) [10]
    
35. std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > (&(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)) [10]
    
36. std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > (&(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)) [10]
    
37. std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > (&(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)) [10]
    
38. $

复制代码