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refs #413 Moved traits BaseOf and MetaBaseOf into dedicated header.

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This commit is contained in:
Mathew Sutcliffe
2015-05-04 22:02:16 +01:00
parent 530ba11747
commit 097522cfa5
2 changed files with 62 additions and 38 deletions
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61
src/blackmisc/inheritance_traits.h Normal file
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@@ -0,0 +1,61 @@
/* Copyright (C) 2015
* swift project Community / Contributors
*
* This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
* directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
* including this file, may be copied, modified, propagated, or distributed except according to the terms
* contained in the LICENSE file.
*/
//! \file
#ifndef BLACKMISC_INHERITANCE_TRAITS_H
#define BLACKMISC_INHERITANCE_TRAITS_H
#include <QMetaType>
#include <type_traits>
namespace BlackMisc
{
class CEmpty;
/*!
* If T has a member typedef base_type, this trait will obtain it, otherwise void.
*/
template <class T>
class BaseOf
{
//template <typename U> static typename U::base_type *test(int);
template <typename U> static typename U::base_type *test(typename std::enable_if<! std::is_same<typename U::base_type, CEmpty>::value, int>::type);
template <typename U> static void *test(...);
public:
//! The declared base_type of T, or void if there is none.
typedef typename std::remove_pointer<decltype(test<T>(0))>::type type;
};
/*!
* It T has a member typedef base_type which is a registered metatype, this trait will obtain it, otherwise void.
*/
template <class T>
class MetaBaseOf
{
public:
//! Type of T::base_type, or void if not declared.
typedef typename std::conditional<QMetaTypeId<typename BaseOf<T>::type>::Defined, typename BaseOf<T>::type, void>::type type;
};
/*!
* Alias for typename BaseOf<T>::type.
*/
template <class T>
using BaseOfT = typename BaseOf<T>::type;
/*!
* Alias for typename MetaBaseOf<T>::type.
*/
template <class T>
using MetaBaseOfT = typename MetaBaseOf<T>::type;
}
#endif

39
src/blackmisc/valueobject_private.h
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@@ -13,6 +13,7 @@
#define BLACKMISC_VALUEOBJECT_PRIVATE_H
#include "blackmisc/blackmiscexport.h"
#include "blackmisc/inheritance_traits.h"
#include <QString>
#include <QMetaType>
#include <QDBusMetaType>
@@ -28,44 +29,6 @@ namespace BlackMisc
template <typename T>
void registerMetaValueType();
/*!
* If T has a member typedef base_type, this trait will obtain it, otherwise void.
*/
template <class T>
class BaseOf
{
//template <typename U> static typename U::base_type *test(int);
template <typename U> static typename U::base_type *test(typename std::enable_if<! std::is_same<typename U::base_type, CEmpty>::value, int>::type);
template <typename U> static void *test(...);
public:
//! The declared base_type of T, or void if there is none.
typedef typename std::remove_pointer<decltype(test<T>(0))>::type type;
};
/*!
* It T has a member typedef base_type which is a registered metatype, this trait will obtain it, otherwise void.
*/
template <class T>
class MetaBaseOf
{
public:
//! Type of T::base_type, or void if not declared.
typedef typename std::conditional<QMetaTypeId<typename BaseOf<T>::type>::Defined, typename BaseOf<T>::type, void>::type type;
};
/*!
* Alias for typename BaseOf<T>::type.
*/
template <class T>
using BaseOfT = typename BaseOf<T>::type;
/*!
* Alias for typename MetaBaseOf<T>::type.
*/
template <class T>
using MetaBaseOfT = typename MetaBaseOf<T>::type;
namespace Private
{
//! \private Needed so we can copy forward-declared CVariant.