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formal_generic_arg.e
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1998-12-22
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-- This file is part of SmallEiffel The GNU Eiffel Compiler.
-- Copyright (C) 1994-98 LORIA - UHP - CRIN - INRIA - FRANCE
-- Dominique COLNET and Suzanne COLLIN - colnet@loria.fr
-- http://www.loria.fr/SmallEiffel
-- SmallEiffel 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; either version 2, or (at your option) any later
-- version. SmallEiffel 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 SmallEiffel; see the file COPYING. If not,
-- write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-- Boston, MA 02111-1307, USA.
--
class FORMAL_GENERIC_ARG
--
-- To store one formal generic argument.
--
inherit GLOBALS;
creation make
feature
name: CLASS_NAME;
-- Name of the formal generic argument.
constraint: TYPE;
feature {NONE}
make(n: like name; c: like constraint) is
require
n /= Void
do
name := n;
constraint := c;
ensure
name = n;
constraint = c
end;
feature
base_class: BASE_CLASS is
do
Result := name.start_position.base_class;
ensure
Result.is_generic
end;
rank: INTEGER is
-- In the corresponding declation list.
do
check
base_class /= Void;
base_class.is_generic;
base_class.formal_generic_list.count >= 1;
end;
Result := base_class.formal_generic_list.index_of(Current.name);
ensure
Result >= 1
end;
constrained: BOOLEAN is
do
Result := (constraint /= void);
end;
start_position: POSITION is
do
Result := name.start_position;
end;
pretty_print is
do
name.pretty_print;
if constrained then
fmt.level_incr;
fmt.put_string("->");
constraint.pretty_print;
fmt.level_decr;
end;
end;
short is
do
short_print.a_class_name(name);
if constrained then
short_print.hook_or("arrow","->");
constraint.short;
end;
end;
invariant
name /= Void;
end -- FORMAL_GENERIC_ARG