include/QtCore/qexception.h

0001 // Copyright (C) 2016 The Qt Company Ltd.
0002 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
0003
0004 #ifndef QTCORE_QEXCEPTION_H
0005 #define QTCORE_QEXCEPTION_H
0006
0007 #include <QtCore/qatomic.h>
0008 #include <QtCore/qshareddata.h>
0009
0010 #ifndef QT_NO_EXCEPTIONS
0011 #  include <exception>
0012 #endif
0013
0014 QT_REQUIRE_CONFIG(future);
0015
0016 QT_BEGIN_NAMESPACE
0017
0018
0019 #if !defined(QT_NO_EXCEPTIONS) || defined(Q_QDOC)
0020
0021 class Q_CORE_EXPORT QException : public std::exception
0022 {
0023 public:
0024     ~QException() noexcept;
0025     virtual void raise() const;
0026     virtual QException *clone() const;
0027 };
0028
0029 class QUnhandledExceptionPrivate;
0030 class Q_CORE_EXPORT QUnhandledException final : public QException
0031 {
0032 public:
0033     QUnhandledException(std::exception_ptr exception = nullptr) noexcept;
0034     ~QUnhandledException() noexcept override;
0035
0036     QUnhandledException(QUnhandledException &&other) noexcept;
0037     QUnhandledException(const QUnhandledException &other) noexcept;
0038
0039     void swap(QUnhandledException &other) noexcept { d.swap(other.d); }
0040
0041     QT_MOVE_ASSIGNMENT_OPERATOR_IMPL_VIA_PURE_SWAP(QUnhandledException)
0042     QUnhandledException &operator=(const QUnhandledException &other) noexcept;
0043
0044     void raise() const override;
0045     QUnhandledException *clone() const override;
0046
0047     std::exception_ptr exception() const;
0048
0049 private:
0050     QSharedDataPointer<QUnhandledExceptionPrivate> d;
0051 };
0052
0053 namespace QtPrivate {
0054
0055 class Q_CORE_EXPORT ExceptionStore
0056 {
0057 public:
0058     void setException(const QException &e);
0059     void setException(std::exception_ptr e);
0060     bool hasException() const;
0061     std::exception_ptr exception() const;
0062     void throwPossibleException();
0063     Q_NORETURN void rethrowException() const;
0064     std::exception_ptr exceptionHolder;
0065 };
0066
0067 } // namespace QtPrivate
0068
0069 #else // QT_NO_EXCEPTIONS
0070
0071 namespace QtPrivate {
0072
0073 class Q_CORE_EXPORT ExceptionStore
0074 {
0075 public:
0076     ExceptionStore() { }
0077     inline void throwPossibleException() {}
0078     inline void rethrowException() const { }
0079 };
0080
0081 } // namespace QtPrivate
0082
0083 #endif // QT_NO_EXCEPTIONS
0084
0085 QT_END_NAMESPACE
0086
0087 #endif