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    $rnd with the precision of $rop. This function stores the
    computed value to avoid another calculation if a lower or
    equal precision is requested.
    Return zero if $rop is exact, a positive value if $rop is
    larger than the exact value, or a negative value if $rop
    is less than the exact value.

   $inex = Rmpfr_const_pi($rop, $rnd);
    Set $rop to the value of Pi rounded to the direction $rnd
    with the precision of $rop. This function uses the Borwein,
    Borwein, Plouffe formula which directly gives the expansion
    of Pi in base 16.
    Return zero if $rop is exact, a positive value if $rop is
    larger than the exact value, or a negative value if $rop
    is less than the exact value.

   $inex = Rmpfr_const_euler($rop, $rnd);
    Set $rop to the value of Euler's constant 0.577...  rounded
    to the direction $rnd with the precision of $rop.
    Return zero if $rop is exact, a positive value if $rop is
    larger than the exact value, or a negative value if $rop