Code coverage for safe_equal.li
///////////////////////////////////////////////////////////////////////////////
// Lisaac Library //
// //
// LSIIT - ULP - CNRS - INRIA - FRANCE //
// //
// This program 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 3 of the License, or //
// (at your option) any later version. //
// //
// This program 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 this program. If not, see <http://www.gnu.org/licenses/>. //
// //
// http://isaacproject.u-strasbg.fr/ //
///////////////////////////////////////////////////////////////////////////////
Section Header
+ name := SAFE_EQUAL(E);
- copyright := "2003-2005 Jérome Boutet, 2003-2007 Benoit Sonntag";
- comment :="The goal of this class is to share the definition of \
\feature `safe_equal'. Feature `safe_equal' compares \
\two arguments of type E, by calling `==' only \
\and only if both arguments have the `same_type'..";
Section Inherit
- parent:OBJECT := OBJECT;
Section Public
- safe_equal (e1, e2:E) :BOOLEAN <-
// In order to avoid run-time type errors, feature `safe_equal' call
// `==' only when `e1' and `e2' have exactly the same `generating_type'.
// Furthermore, this feature avoid argument passing from some
// expanded type to the corresponding reference type (no automatic
// allocation of some reference type during the comparison).
( /*
+ result:BOOLEAN;
( e1.is_basic_expanded_type).if { then
result := (e1 = e2);
}.elseif {e1.is_expanded_type} then {
result := e1 == e2;
}.elseif {e1 = e2} then {
result := true;
}.elseif {(e1 = NULL) || {e2 = NULL}} then {
}.elseif {e1.generating_type = e2.generating_type} then {
result := e1 == e2;
}; // end if
result
*/
(e1=e2) || {(e1!=NULL) {e1==e2}}
);