When did “and” become an operator in C++

From the C++03 standard, section 2.5:

2.5 Alternative tokens

Alternative token representations are provided for some operators and punctuators. In all respects of the language, each alternative token behaves the same, respectively, as its primary token, except for its spelling. The set of alternative tokens is defined in Table 2.

Table 2—alternative tokens

alternative primary 
  <%         { 
  %>         } 
  <:         [ 
  :>         ] 
  %:         # 
  %:%:       ## 
  and        && 
  bitor      | 
  or         || 
  xor        ˆ 
  compl      ˜ 
  bitand     & 
  and_eq     &= 
  or_eq      |= 
  xor_eq     ˆ= 
  not        ! 
  not_eq     !=