inline in C++

#include <iostream>
#include <stdlib.h>
using namespace std;

typedef struct CStruct
{
    int cStructInt=1;
};

typedef struct CStruct2 : CStruct
{
    inline int returnCStructInt()
    {
        return cStructInt;
    }
};

int main()
{
    CStruct2 cst2;

    cout << "cStructInt=" << cst2.returnCStructInt() << '\n';

    //system("pause");
    return 0;
}