[postmodern-devel] Binary and unary operators

[Ivan Boldyrev]

1.  You are missing such operators like || and && (former is string
    concatenation, latter is tests overlapping geometric objects).

    There are also
      a. math: !, !!, #, >>, <<.

      b. geometric: ##, @@, @-@, ~=, <->, &<, &>, <<|, |>>, &<|, |&>,
         <^, >^, ?#, ?|, ?-|, ?||, @>, <@.

      c. network: <<=, >>=.

    ?| is both binary and unary operator, ! is postfix (but is
    equivalent to prefix !!, so you may define :! that expands to prefix
    !! or just :!! that expands to !!).

    There are also another operators like @, but they have
    functions-substitutions (@ x <=> abs(x)).

    psql's command \do (describe operators) also lists other operators.

2.  As PSQL allows defining own operators, I think it worth exporting
    s-sql::def-infix-ops or creating some more flexible user macro (one
    might prefer to use :concat instead of :\|\|).

    With such facility you don't need to define such rare-used operators
    like @-@ and ?-|, allowing user to define them.

-- 
Ivan Boldyrev

                                   Violets are red
                                   Roses are blue
                                   It's amazing what DNA splicing can do.