[已解决]返回数组的引用

我是第一名

#include <iostream>
#include <string>
using namespace std;
string (& str(string s))[10];

typedef string sss[10];
sss& str1(string s);

auto str2(string s)->string(&)[10];

string s1[10];
decltype(s1)& str3(string s);

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

$ cat main.cpp
#include <iostream>
#include <string>

//using namespace std;
using std::string;

string (&str(string s))[10];

typedef string sss[10];
sss &str1(string s);

auto str2(string s) -> string (&)[10];

string s1[10];
decltype(s1) &str3(string s);

using std::cout, std::endl;

int main() {
    cout << typeid(str).name() << endl;
    cout << typeid(str1).name() << endl;
    cout << typeid(str2).name() << endl;
    cout << typeid(str3).name() << endl;
    return 0;
}
$ g++-debug -o main main.cpp
$ ./main
FRA10_NSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES4_E
FRA10_NSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES4_E
FRA10_NSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES4_E
FRA10_NSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES4_E
$ ./main | c++filt -t
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]
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]
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]
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]
$

跳转到最佳答案楼层

人造人

是

人造人

$ cat main.cpp
#include <iostream>
#include <string>

//using namespace std;
using std::string;

string (&str(string s))[10];

typedef string sss[10];
sss &str1(string s);

auto str2(string s) -> string (&)[10];

string s1[10];
decltype(s1) &str3(string s);

using std::cout, std::endl;

int main() {
    cout << typeid(str).name() << endl;
    cout << typeid(str1).name() << endl;
    cout << typeid(str2).name() << endl;
    cout << typeid(str3).name() << endl;
    return 0;
}
$ g++-debug -o main main.cpp
$ ./main
FRA10_NSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES4_E
FRA10_NSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES4_E
FRA10_NSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES4_E
FRA10_NSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES4_E
$ ./main | c++filt -t
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]
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]
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]
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]
$