Accessing struct and union member functions within a class - c++

Question

In this program I just want to test a structure and union within a class itself.
I had created a public struct, and declared a union within it.
I am using Visual Studio and Qt Creator to type this code.
I want to ask, is defining a struct within a class good and accessible?
I am having problem with that.
If this is correct, how could I access the method or data member of the struct from main?
I'd also like to use the union member of the struct.
If the method or functions of the struct are not accessible this way,. what's another way of doing it?
//************************************************************************************
#ifndef CTEST_H
#define CTEST_H
class CTest {
int value;
public:
CTest(int);
int getValue();
struct CTESTSTRUCT {
union CTESTUNION
{
enum CTestEnum {
var1 = 1
};
char varChar1 = 'Y';
char varChar2 /*= 'N'*/; //union atmost have one field initializer
};
int structValue();
int testVal;
};
~CTest();
};
#endif
//************************************************************************************
#include <iostream>
#include "CTest.h"
CTest::CTest(int argVal) : value(argVal) {
std::cout << "Constructor Called" << std::endl;
}
int CTest::getValue() {
std::cout << "getValue Called" << std::endl;
return value;
}
int CTest::CTESTSTRUCT::structValue() {
std::cout << "CTESTSTRUCT::setValue Called" << std::endl;
return CTESTSTRUCT::CTESTUNION::var1;
}
CTest::~CTest() {
std::cout << "Distructor Called" << std::endl;
}
//*********************************************************************************
#include <iostream>
#include "CTest.h"
using namespace std;
CTest * ctestObj;
int main() {
ctestObj = new CTest(25);
int returnVal = ctestObj->getValue();
std::cout << "Value Returned: " << returnVal << std::endl;
std::cout << "structVal: " << std::endl;
//CTest::CTESTSTRUCT::testVal = 10;
delete ctestObj;
return 0;
}

Answer 1

What you're actually trying to do is have an instance of a struct inside your class. What you did was define a class within your class (which did not actually give your class a member of that type, but only scoped its definition).
So what you need to do is pull our the struct, from the class:
struct CTESTSTRUCT
{
// ...
};
And then give CTest a member of type CTESTSTRUCT
class CTest {
int value;
public:
CTest(int);
int getValue();
CTESTSTRUCT test;
~CTest();
};
Now you can access it like so:
int main() {
CTest * ctestObj;
ctestObj = new CTest(25);
int returnVal = ctestObj->getValue();
std::cout << "Value Returned: " << returnVal << std::endl;
std::cout << "structVal: " << std::endl;
ctestObj->test.testVal = 10;
delete ctestObj;
return 0;
}