Question

Will the following code compile? If not, why not? Assume it is using the standard namespaces, includes all necessary libraries and has a defined class called "MyClass" with a default constructor.

vector <MyClass> vec;

MyClass myClass;

vec.push_back(myClass);

Options:

1. No, vectors must push back data types, not instances of a data type

2. no, space was never allocated for the vector

3. no, you can not use a user defined data type at the data type for a vector

4. yes, it can compile

Answer 1

#include <iostream>
#include <vector>
using namespace std;

class MyClass{ 
};

int main()
{
    vector <MyClass> vec;
    MyClass myClass;
    vec.push_back(myClass);
    return 0;
}

4. yes, it can compile