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Specify interface requirements as an C++ concept

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PR #19440.
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Chocobo1 2023-08-12 20:53:03 +08:00 • committed by GitHub
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/*
* Bittorrent Client using Qt and libtorrent.
* Copyright (C) 2023 Mike Tzou (Chocobo1)
*
* 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 2
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* In addition, as a special exception, the copyright holders give permission to
* link this program with the OpenSSL project's "OpenSSL" library (or with
* modified versions of it that use the same license as the "OpenSSL" library),
* and distribute the linked executables. You must obey the GNU General Public
* License in all respects for all of the code used other than "OpenSSL". If you
* modify file(s), you may extend this exception to your version of the file(s),
* but you are not obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*/
#include <QObject>
#include <QString>
#include <QTest>
#include "base/concepts/stringable.h"
class TestConceptsStringable final : public QObject
{
Q_OBJECT
Q_DISABLE_COPY_MOVE(TestConceptsStringable)
public:
TestConceptsStringable() = default;
private slots:
void testStringable() const
{
struct A
{
};
static_assert(!Stringable<A>);
struct B
{
B(QString) {}
};
static_assert(!Stringable<B>);
struct C
{
QString toString() const { return {}; }
};
static_assert(!Stringable<C>);
struct D
{
D(QString) {}
QString toString() const { return {}; }
};
static_assert(Stringable<D>);
}
};
QTEST_APPLESS_MAIN(TestConceptsStringable)
#include "testconceptsstringable.moc"