C++ Object Instantiation vs Assignment

Question

What is the difference between this:

TestClass t;

And this:

TestClass t = TestClass();

I expected that th

Answer 1

TestClass t;

calls the default constructor.

TestClass t = TestClass();

is a copy initialization. It will call the default constructor for TestClass() and then the copy constructor (theoretically, copying is subject to copy elision). No assignment takes place here.

There's also the notion of direct initialization:

TestClass t(TestClass());

If you want to use the assignment operator:

TestClass t;
TestClass s;
t = s;