num/sign.fz
# This file is part of the Fuzion language implementation.
#
# The Fuzion language implementation is free software: you can redistribute it
# and/or modify it under the terms of the GNU General Public License as published
# by the Free Software Foundation, version 3 of the License.
#
# The Fuzion language implementation is distributed in the hope that it will be
# useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
# License for more details.
#
# You should have received a copy of the GNU General Public License along with The
# Fuzion language implementation. If not, see <https://www.gnu.org/licenses/>.
# -----------------------------------------------------------------------
#
# Tokiwa Software GmbH, Germany
#
# Source code of Fuzion standard library feature num.sign
#
# -----------------------------------------------------------------------
# the sign of a number
#
# this can be plus or minus
#
public sign : choice num.plus num.minus, property.equatable is
module is_plus =>
match sign.this
num.plus => true
num.minus => false
# equality: are these signs equal?
#
public fixed type.equality(a, b num.sign) bool =>
match a
num.plus =>
match b
num.plus => true
num.minus => false
num.minus =>
match b
num.plus => false
num.minus => true
public redef as_string String =>
match sign.this
num.plus => ""
num.minus => "-"
last changed: 2024-03-07