Error regarding Copy constructor and pushback method of vector

using namespace std;

class test {

    public:
        int p;
    test() {
        cout << "base" << endl;
       }
    test(int x) {
        p = new int;* p = x;
        cout<<"args" << endl;
       }
    test(test & args) {
        p = new int;
        *p = *(args.p);
        cout<<“acopy”<< endl; 
       } 
    };

void print(test arg){
    cout <<"funval"<< *(arg.p);
}
void printref(test & arg) {
    cout <<“funref”<< *(arg.p); 
} 
int main() 
{
    test tl;
    test t2 {10};
    test t3 = t2;
    print(t3);
    printref(t2);
    vector < test > myvec;
    myvec.push_back(t2);
    return 0;
}

Hello,

New to c++ here. I am trying to understand the calls of copy constructor with the code below.

My understanding seemed to be be correct till I created a vector of my class test.

When I run the below code , I run into error for line - myvec.push_back(t2)

Error 1:

/usr/include/c++/6/bits/stl_construct.h:75:7: error: invalid initialization of non—const reference of type test&' from an rvalue of type 'test'

Error2:

/usr/include/c++/6/ext/new_allocator.h:120:4: error: b inding 'const test' to reference of type 'test&' disca rds qualifiers { ::new((void *) p) _Up(std::forward<_Args>( args).

I read few articles here and I seem to have found the solution too, as below : Change for copy constructor Test(const test&args)

The thing I am unclear about is the description of errors generated .

1. In error1 , it says about rvalue. In my pushback call,t2 is an l-val not r-val. Correct? So,which r-val does error talk about?

2. I also read about push_back call.it’s syntax is: void push_back (const value_type& val); This expects a const type value and I am passing a non-constant which is ok. But I assume, push_back behind the pictures calls copy constructor and then a const value is passed to a non const argument in copy constructor and hence the error?

Can you please help me clarify my understandings here?

Thanks.