Why is the ternary operator not working in my code?

I have the following piece of code

mystack.empty() ? return 1 : return 0;

which looks perfect from the syntax point of view but whenever I try to run it throws an error saying

[Error] expected ':' before 'return'

and

[Error] expected primary-expression before 'return'

Do ternary operator don't work with return statements or is there something wrong with the code? And I guess the code is self explanatory.

Thank you.