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130 lines
4.5 KiB
130 lines
4.5 KiB
/****************************************************************************
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**
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** https://www.qxorm.com/
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** Copyright (C) 2013 Lionel Marty (contact@qxorm.com)
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**
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** This file is part of the QxOrm library
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**
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** This software is provided 'as-is', without any express or implied
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** warranty. In no event will the authors be held liable for any
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** damages arising from the use of this software
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**
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** Commercial Usage
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** Licensees holding valid commercial QxOrm licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Lionel Marty
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file 'license.gpl3.txt' included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met : http://www.gnu.org/copyleft/gpl.html
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**
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** If you are unsure which license is appropriate for your use, or
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** if you have questions regarding the use of this file, please contact :
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** contact@qxorm.com
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**
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****************************************************************************/
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#ifndef _QX_STD_OPTIONAL_H_
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#define _QX_STD_OPTIONAL_H_
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#ifdef _MSC_VER
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#pragma once
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#endif
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/*!
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* \file QxStdOptional.h
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* \author Lionel Marty
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* \ingroup QxExtras
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* \brief Support std::optional<T> class (requires a C++17 compiler) to manage NULL database value, this header should be included just after <QxOrm.h> header file (ideally in a precompiled header)
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*/
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#include <optional>
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#include <QtCore/qdatastream.h>
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#include <QxOrm.h>
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#include <QxTraits/construct_null_qvariant.h>
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template <typename T>
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QDataStream & operator<< (QDataStream & stream, const std::optional<T> & t)
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{
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qint8 iHasData = (t ? 1 : 0);
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stream << iHasData;
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if (t) { stream << (* t); }
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return stream;
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}
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template <typename T>
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QDataStream & operator>> (QDataStream & stream, std::optional<T> & t)
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{
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qint8 iHasData = 0;
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stream >> iHasData;
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if (iHasData) { t = T(); stream >> (* t); }
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else { t = std::optional<T>(); }
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return stream;
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}
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QX_REGISTER_CLASS_NAME_TEMPLATE_1(std::optional)
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namespace qx {
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namespace trait {
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template <typename T>
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struct get_sql_type< std::optional<T> >
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{ static inline const char * get() { return qx::trait::get_sql_type<T>::get(); } };
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} // namespace trait
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} // namespace qx
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namespace qx {
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namespace cvt {
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namespace detail {
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#ifndef _QX_NO_JSON
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template <typename T> struct QxConvert_ToJson< std::optional<T> > {
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static inline QJsonValue toJson(const std::optional<T> & t, const QString & format)
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{ if (t) { return qx::cvt::to_json((* t), format); }; return QJsonValue(); } };
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template <typename T> struct QxConvert_FromJson< std::optional<T> > {
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static inline qx_bool fromJson(const QJsonValue & j, std::optional<T> & t, const QString & format)
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{
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if (j.isNull()) { t = std::optional<T>(); return qx_bool(true); }
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else if (! t) { t = T(); }
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return qx::cvt::from_json(j, (* t), format);
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} };
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#endif // _QX_NO_JSON
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template <typename T> struct QxConvert_ToString< std::optional<T> > {
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static inline QString toString(const std::optional<T> & t, const QString & format, int index, qx::cvt::context::ctx_type ctx)
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{ if (t) { return qx::cvt::to_string((* t), format, index, ctx); }; return QString(); } };
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template <typename T> struct QxConvert_FromString< std::optional<T> > {
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static inline qx_bool fromString(const QString & s, std::optional<T> & t, const QString & format, int index, qx::cvt::context::ctx_type ctx)
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{ if (! t) { t = T(); }; return qx::cvt::from_string(s, (* t), format, index, ctx); } };
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template <typename T> struct QxConvert_ToVariant< std::optional<T> > {
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static inline QVariant toVariant(const std::optional<T> & t, const QString & format, int index, qx::cvt::context::ctx_type ctx)
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{ if (t) { return qx::cvt::to_variant((* t), format, index, ctx); }; return qx::trait::construct_null_qvariant<T>::get(); } };
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template <typename T> struct QxConvert_FromVariant< std::optional<T> > {
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static inline qx_bool fromVariant(const QVariant & v, std::optional<T> & t, const QString & format, int index, qx::cvt::context::ctx_type ctx)
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{
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if (v.isNull()) { t = std::optional<T>(); return qx_bool(true); }
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else if (! t) { t = T(); }
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return qx::cvt::from_variant(v, (* t), format, index, ctx);
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} };
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} // namespace detail
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} // namespace cvt
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} // namespace qx
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#endif // _QX_STD_OPTIONAL_H_
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