Difference between constructor calls with and without ( )

Question

I\'m a C++ beginner and would like to understand why

return std::list();

needs parentheses, but

std::list         


        

Answer 1

Both statements call default constructor.

return std::list();

This is same as:

std::list value;
return value;

Here an object is created (using default constructor) and object is returned.

std::list foo;

Here object foo is created using the default constructor.

Here are other way to do the same in C++11:

std::list foo;
std::list foo1{}; // C++11