[lex.operators]

The lexical representation of C++ programs includes a number of preprocessing tokens that are used in the syntax of the preprocessor or are converted into tokens for operators and punctuators:

preprocessing-op-or-punc:
preprocessing-operator
operator-or-punctuator

preprocessing-operator: one of
# ## %: %:%:

operator-or-punctuator: one of
{        }        [        ]        (        )        [:       :]
<%       %>       <:       :>       ;        :        ..
?        ::       .        .*       ->       ->*      ^^       ~
!        +        -        *        /        %        ^        &        |
=        +=       -=       *=       /=       %=       ^=       &=       |=
==       !=       <        >        <=       >=       <=>      &&       ||
<<       >>       <<=      >>=      ++       --       ,
and      or       xor      not      bitand   bitor    compl
and_eq   or_eq    xor_eq   not_eq

Each operator-or-punctuator is converted to a single token in translation phase 6 ([lex.phases]).