Union.h

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/*
* Nirvana IDL front-end library.
*
* This is a part of the Nirvana project.
*
* Author: Igor Popov
*
* Copyright (c) 2021 Igor Popov.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser 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 Lesser General Public
* License along with this library.  If not, see <http://www.gnu.org/licenses/>.
*
* Send comments and/or bug reports to:
*  popov.nirvana@gmail.com
*/
#ifndef IDLFE_AST_UNION_H_
#define IDLFE_AST_UNION_H_
#pragma once
 
#include "StructBase.h"
#include "ForwardDeclarable.h"
#include "UnionElement.h"
 
namespace AST {
 
class Union;
 
class UnionDecl :
    public ItemWithId
{
public:
    const Union& definition () const
    {
        assert (definition_);
        return *definition_;
    }
 
private:
    template <class T> friend class Ptr;
    friend class Builder;
 
    UnionDecl (Builder& builder, const SimpleDeclarator& name) :
        ItemWithId (Item::Kind::UNION_DECL, builder, name),
        definition_ (nullptr)
    {}
 
private:
    const Union* definition_;
};
 
class Union :
    public ItemWithId,
    public ContainerT <UnionElement>,
    public ForwardDeclarable
{
public:
    const Type& discriminator_type () const noexcept
    {
        return discriminator_type_;
    }
 
    const Variant& default_label () const noexcept
    {
        return default_label_;
    }
 
    const UnionElement* default_element () const noexcept
    {
        return default_element_;
    }
 
    operator const StructBase& () const noexcept
    {
        return reinterpret_cast <const StructBase&> (*this);
    }
 
private:
    template <class T> friend class Ptr;
    friend class Builder;
 
    Union (Builder& builder, const SimpleDeclarator& name,
        const Type& discriminator_type) :
        ItemWithId (Item::Kind::UNION, builder, name),
        discriminator_type_ (discriminator_type),
        default_element_ (nullptr)
    {}
 
private:
    Type discriminator_type_;
    const UnionElement* default_element_;
    Variant default_label_;
};
 
}
 
#endif