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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QHOSTINFO_H
#define QHOSTINFO_H
#include <QtNetwork/qtnetworkglobal.h>
#include <QtCore/qlist.h>
#include <QtCore/qscopedpointer.h>
#include <QtNetwork/qhostaddress.h>
QT_BEGIN_NAMESPACE
class QObject;
class QHostInfoPrivate;
class Q_NETWORK_EXPORT QHostInfo
{
public:
enum HostInfoError {
NoError,
HostNotFound,
UnknownError
};
explicit QHostInfo(int lookupId = -1);
QHostInfo(const QHostInfo &d);
QHostInfo(QHostInfo &&other) noexcept : d_ptr(std::exchange(other.d_ptr, nullptr)) {}
QHostInfo &operator=(const QHostInfo &d);
QHostInfo &operator=(QHostInfo &&other) noexcept { swap(other); return *this; }
~QHostInfo();
void swap(QHostInfo &other) noexcept { qt_ptr_swap(d_ptr, other.d_ptr); }
QString hostName() const;
void setHostName(const QString &name);
QList<QHostAddress> addresses() const;
void setAddresses(const QList<QHostAddress> &addresses);
HostInfoError error() const;
void setError(HostInfoError error);
QString errorString() const;
void setErrorString(const QString &errorString);
void setLookupId(int id);
int lookupId() const;
static int lookupHost(const QString &name, QObject *receiver, const char *member);
static void abortHostLookup(int lookupId);
static QHostInfo fromName(const QString &name);
static QString localHostName();
static QString localDomainName();
#ifdef Q_CLANG_QDOC
template<typename Functor>
static int lookupHost(const QString &name, Functor functor);
template<typename Functor>
static int lookupHost(const QString &name, const QObject *context, Functor functor);
#else
// lookupHost to a QObject slot
template <typename Func>
static inline int lookupHost(const QString &name,
const typename QtPrivate::FunctionPointer<Func>::Object *receiver,
Func slot)
{
typedef QtPrivate::FunctionPointer<Func> SlotType;
typedef QtPrivate::FunctionPointer<void (*)(QHostInfo)> SignalType;
static_assert(int(SignalType::ArgumentCount) >= int(SlotType::ArgumentCount),
"The slot requires more arguments than the signal provides.");
static_assert((QtPrivate::CheckCompatibleArguments<typename SignalType::Arguments,
typename SlotType::Arguments>::value),
"Signal and slot arguments are not compatible.");
static_assert((QtPrivate::AreArgumentsCompatible<typename SlotType::ReturnType,
typename SignalType::ReturnType>::value),
"Return type of the slot is not compatible "
"with the return type of the signal.");
auto slotObj = new QtPrivate::QSlotObject<Func, typename SlotType::Arguments, void>(slot);
return lookupHostImpl(name, receiver, slotObj, nullptr);
}
// lookupHost to a callable (without context)
template <typename Func>
static inline typename std::enable_if<!QtPrivate::FunctionPointer<Func>::IsPointerToMemberFunction &&
!std::is_same<const char *, Func>::value, int>::type
lookupHost(const QString &name, Func slot)
{
return lookupHost(name, nullptr, std::move(slot));
}
// lookupHost to a functor or function pointer (with context)
template <typename Func1>
static inline typename std::enable_if<!QtPrivate::FunctionPointer<Func1>::IsPointerToMemberFunction &&
!std::is_same<const char*, Func1>::value, int>::type
lookupHost(const QString &name, QObject *context, Func1 slot)
{
typedef QtPrivate::FunctionPointer<Func1> SlotType;
static_assert(int(SlotType::ArgumentCount) <= 1,
"The slot must not require more than one argument");
auto slotObj = new QtPrivate::QFunctorSlotObject<Func1, 1,
typename QtPrivate::List<QHostInfo>,
void>(std::move(slot));
return lookupHostImpl(name, context, slotObj, nullptr);
}
#endif // Q_QDOC
private:
QHostInfoPrivate *d_ptr;
Q_DECLARE_PRIVATE(QHostInfo)
static int lookupHostImpl(const QString &name,
const QObject *receiver,
QtPrivate::QSlotObjectBase *slotObj,
const char *member);
friend QHostInfo Q_NETWORK_EXPORT qt_qhostinfo_lookup(const QString &name, QObject *receiver,
const char *member, bool *valid, int *id);
};
Q_DECLARE_SHARED(QHostInfo)
QT_END_NAMESPACE
QT_DECL_METATYPE_EXTERN(QHostInfo, Q_NETWORK_EXPORT)
#endif // QHOSTINFO_H
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