Visitor.cpp

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/*
    Copyright (C) 2014-2016 Leosac
 
    This file is part of Leosac.
 
    Leosac is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    Leosac 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 Affero General Public License for more details.
 
    You should have received a copy of the GNU Affero General Public License
    along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
 
#include "tools/Visitor.hpp"
#include "tools/IVisitable.hpp"
#include "gtest/gtest.h"
 
using namespace Leosac;
using namespace Leosac::Tools;
 
namespace Leosac
{
namespace Test
{
 
struct DummyVisitable : public virtual IVisitable
{
    DummyVisitable() = default;
    MAKE_VISITABLE();
};
 
struct DummyVisitor : public Visitor<DummyVisitable>
{
    DummyVisitor()
    {
    }
 
    void visit(DummyVisitable &) override
    {
        visited_non_const_ = true;
    }
 
    void visit(const DummyVisitable &) override
    {
        visited_const_ = true;
    }
 
    bool visited_non_const_{false};
    bool visited_const_{false};
};
 
TEST(TestVisitor, simple_non_const)
{
    DummyVisitable visitable;
    DummyVisitor visitor;
    visitable.accept(visitor);
    ASSERT_TRUE(visitor.visited_non_const_);
    ASSERT_FALSE(visitor.visited_const_);
}
 
TEST(TestVisitor, simple_const)
{
    const DummyVisitable visitable;
    DummyVisitor visitor;
    visitable.accept(visitor);
    ASSERT_TRUE(visitor.visited_const_);
    ASSERT_FALSE(visitor.visited_non_const_);
}
 
struct DummyConstOnlyVisitor : public Visitor<DummyVisitable>
{
    DummyConstOnlyVisitor()
        : visited_const_(false)
    {
    }
 
    void visit(const DummyVisitable &) override
    {
        visited_const_ = true;
    }
 
    bool visited_const_;
};
 
TEST(TestVisitor, const_visit_accept_non_const_visitable)
{
    DummyVisitable visitable;
    DummyConstOnlyVisitor visitor;
    visitable.accept(visitor);
    ASSERT_TRUE(visitor.visited_const_);
}
 
TEST(TestVisitor, const_visit_accept_const_visitable)
{
    const DummyVisitable visitable;
    DummyConstOnlyVisitor visitor;
    visitable.accept(visitor);
    ASSERT_TRUE(visitor.visited_const_);
}
 
struct DummyVisitor2 : public Visitor<DummyVisitable>
{
    DummyVisitor2() = default;
 
    void visit(const DummyVisitable &) override
    {
        visited_ = true;
    }
 
    bool visited_{false};
};
 
struct DummyChildVisitable : public virtual DummyVisitable
{
    DummyChildVisitable() = default;
 
    MAKE_VISITABLE_FALLBACK(DummyVisitable);
};
 
TEST(TestVisitor, test_class_hierarchy)
{
    DummyChildVisitable visitable;
    DummyVisitor2 visitor;
    visitable.accept(visitor);
    ASSERT_TRUE(visitor.visited_);
}
}
}