How to return struct from class where it is defined?-CodePudding

I want to return a copy of struct from public class function, and i define this struct inside this class as a private member.

Is it possible to return this structure of any other type of custom data?

Consider this simple example:

class Test {
private:
    struct sTest {
        int i = 1;
    }_sTest;
public:
    sTest GetStruct() {
        return _sTest;
    }
};

then after i create object of this class:

Test cTest;

how can i call

 cTest.GetStruct()

to get

 _sTest

CodePudding user response：

You can use auto to store the object.

Following is sample code. See it here in action:

#include <iostream>
using namespace std;

class Test {
private:
    struct sTest {
        int i = 1;
    }_sTest;
public:
    sTest GetStruct() {
        return _sTest;
    }
};



int main()
{
    Test a;
    auto obj = a.GetStruct();
    
    cout<< obj.i <<"\nDone!!!\n";
    return 0;
}

Output:

1
Done!!!

Note: It is fine on other compilers also. Check here on other compilers also.

CodePudding user response：

Since the private class is not accessible from the class Test outside, use the keyword auto.

auto test = cTest.GetStruct();

CodePudding user response：

Yes, it is perfectly safe. It is like any other type of data. With auto you are just telling the compiler to guess which kind of variable would be.