Almost all C++ operators can be overloaded. 

These are the only ones that can't be overloaded:

• the field-selection dot (.)
• dot-star (.*)
• double colon (::)
• conditional expression (?:)

The preprocessor operators (# and ##) are not C or C++ language operators and thus can't be overloaded. 

Other non-operator punctuation, such as semicolon (;), can't be overloaded.