diff options
Diffstat (limited to 'src/corelib/global/qglobal.cpp')
| -rw-r--r-- | src/corelib/global/qglobal.cpp | 153 |
1 files changed, 81 insertions, 72 deletions
diff --git a/src/corelib/global/qglobal.cpp b/src/corelib/global/qglobal.cpp index 0fba9b309b..d95064af27 100644 --- a/src/corelib/global/qglobal.cpp +++ b/src/corelib/global/qglobal.cpp @@ -525,6 +525,31 @@ Q_STATIC_ASSERT((std::is_same<qsizetype, qptrdiff>::value)); made private. In that case, no error would be reported, but your application would probably crash when you called a member function of \c{w}. + + \sa Q_DISABLE_COPY_MOVE, Q_DISABLE_MOVE +*/ + +/*! + \macro Q_DISABLE_MOVE(Class) + \relates QObject + + Disables the use of move constructors and move assignment operators + for the given \a Class. + + \sa Q_DISABLE_COPY, Q_DISABLE_COPY_MOVE + \since 5.13 +*/ + +/*! + \macro Q_DISABLE_COPY_MOVE(Class) + \relates QObject + + A convenience macro that disables the use of copy constructors, assignment + operators, move constructors and move assignment operators for the given + \a Class, combining Q_DISABLE_COPY and Q_DISABLE_MOVE. + + \sa Q_DISABLE_COPY, Q_DISABLE_MOVE + \since 5.13 */ /*! @@ -1122,12 +1147,12 @@ Q_STATIC_ASSERT((std::is_same<qsizetype, qptrdiff>::value)); \sa QT_VERSION_STR, QLibraryInfo::version() */ -const char *qVersion() Q_DECL_NOTHROW +const char *qVersion() noexcept { return QT_VERSION_STR; } -bool qSharedBuild() Q_DECL_NOTHROW +bool qSharedBuild() noexcept { #ifdef QT_SHARED return true; @@ -1954,11 +1979,11 @@ bool qSharedBuild() Q_DECL_NOTHROW a specified version of Qt or any earlier version. The default version number is 5.0, meaning that functions deprecated in or before Qt 5.0 will not be included. - Examples: - When using a future release of Qt 5, set QT_DISABLE_DEPRECATED_BEFORE=0x050100 to - disable functions deprecated in Qt 5.1 and earlier. In any release, set - QT_DISABLE_DEPRECATED_BEFORE=0x000000 to enable any functions, including the ones - deprecated in Qt 5.0 + For instance, when using a future release of Qt 5, set + \c{QT_DISABLE_DEPRECATED_BEFORE=0x050100} to disable functions deprecated in + Qt 5.1 and earlier. In any release, set + \c{QT_DISABLE_DEPRECATED_BEFORE=0x000000} to enable all functions, including + the ones deprecated in Qt 5.0. \sa QT_DEPRECATED_WARNINGS */ @@ -1968,12 +1993,24 @@ bool qSharedBuild() Q_DECL_NOTHROW \macro QT_DEPRECATED_WARNINGS \relates <QtGlobal> - If this macro is defined, the compiler will generate warnings if API declared as + Since Qt 5.13, this macro has no effect. In Qt 5.12 and before, if this macro + is defined, the compiler will generate warnings if any API declared as deprecated by Qt is used. - \sa QT_DISABLE_DEPRECATED_BEFORE + \sa QT_DISABLE_DEPRECATED_BEFORE, QT_NO_DEPRECATED_WARNINGS */ +/*! + \macro QT_NO_DEPRECATED_WARNINGS + \relates <QtGlobal> + \since 5.13 + + This macro can be used to suppress deprecation warnings that would otherwise + be generated when using deprecated APIs. + + \sa QT_DISABLE_DEPRECATED_BEFORE +*/ + #if defined(QT_BUILD_QMAKE) // needed to bootstrap qmake static const unsigned int qt_one = 1; @@ -2025,6 +2062,8 @@ static const char *osVer_helper(QOperatingSystemVersion version = QOperatingSyst return "Sierra"; case 13: return "High Sierra"; + case 14: + return "Mojave"; } } // unknown, future version @@ -2908,18 +2947,18 @@ enum { QByteArray QSysInfo::machineUniqueId() { #ifdef Q_OS_BSD4 - char uuid[UuidStringLen]; + char uuid[UuidStringLen + 1]; size_t uuidlen = sizeof(uuid); # ifdef KERN_HOSTUUID int name[] = { CTL_KERN, KERN_HOSTUUID }; if (sysctl(name, sizeof name / sizeof name[0], &uuid, &uuidlen, nullptr, 0) == 0 && uuidlen == sizeof(uuid)) - return QByteArray(uuid, uuidlen); + return QByteArray(uuid, uuidlen - 1); # else // Darwin: no fixed value, we need to search by name if (sysctlbyname("kern.uuid", uuid, &uuidlen, nullptr, 0) == 0 && uuidlen == sizeof(uuid)) - return QByteArray(uuid, uuidlen); + return QByteArray(uuid, uuidlen - 1); # endif #elif defined(Q_OS_UNIX) // The modern name on Linux is /etc/machine-id, but that path is @@ -2942,7 +2981,7 @@ QByteArray QSysInfo::machineUniqueId() #elif defined(Q_OS_WIN) && !defined(Q_OS_WINRT) // Let's poke at the registry HKEY key = NULL; - if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, L"SOFTWARE\\Microsoft\\Cryptography", 0, KEY_READ, &key) + if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, L"SOFTWARE\\Microsoft\\Cryptography", 0, KEY_READ | KEY_WOW64_64KEY, &key) == ERROR_SUCCESS) { wchar_t buffer[UuidStringLen + 1]; DWORD size = sizeof(buffer); @@ -2983,11 +3022,11 @@ QByteArray QSysInfo::bootUniqueId() } #elif defined(Q_OS_DARWIN) // "kern.bootsessionuuid" is only available by name - char uuid[UuidStringLen]; + char uuid[UuidStringLen + 1]; size_t uuidlen = sizeof(uuid); if (sysctlbyname("kern.bootsessionuuid", uuid, &uuidlen, nullptr, 0) == 0 && uuidlen == sizeof(uuid)) - return QByteArray(uuid, uuidlen); + return QByteArray(uuid, uuidlen - 1); #endif return QByteArray(); }; @@ -3167,7 +3206,7 @@ QByteArray QSysInfo::bootUniqueId() The Q_CHECK_PTR macro calls this function if an allocation check fails. */ -void qt_check_pointer(const char *n, int l) Q_DECL_NOTHROW +void qt_check_pointer(const char *n, int l) noexcept { // make separate printing calls so that the first one may flush; // the second one could want to allocate memory (fputs prints a @@ -3194,7 +3233,7 @@ void qBadAlloc() Allows you to call std::terminate() without including <exception>. Called internally from QT_TERMINATE_ON_EXCEPTION */ -Q_NORETURN void qTerminate() Q_DECL_NOTHROW +Q_NORETURN void qTerminate() noexcept { std::terminate(); } @@ -3203,7 +3242,7 @@ Q_NORETURN void qTerminate() Q_DECL_NOTHROW /* The Q_ASSERT macro calls this function when the test fails. */ -void qt_assert(const char *assertion, const char *file, int line) Q_DECL_NOTHROW +void qt_assert(const char *assertion, const char *file, int line) noexcept { QMessageLogger(file, line, nullptr).fatal("ASSERT: \"%s\" in file %s, line %d", assertion, file, line); } @@ -3211,7 +3250,7 @@ void qt_assert(const char *assertion, const char *file, int line) Q_DECL_NOTHROW /* The Q_ASSERT_X macro calls this function when the test fails. */ -void qt_assert_x(const char *where, const char *what, const char *file, int line) Q_DECL_NOTHROW +void qt_assert_x(const char *where, const char *what, const char *file, int line) noexcept { QMessageLogger(file, line, nullptr).fatal("ASSERT failure in %s: \"%s\", file %s, line %d", where, what, file, line); } @@ -3413,14 +3452,12 @@ QString qEnvironmentVariable(const char *varName) Returns whether the environment variable \a varName is empty. Equivalent to - \code - qgetenv(varName).isEmpty() - \endcode + \snippet code/src_corelib_global_qglobal.cpp is-empty except that it's potentially much faster, and can't throw exceptions. \sa qgetenv(), qEnvironmentVariable(), qEnvironmentVariableIsSet() */ -bool qEnvironmentVariableIsEmpty(const char *varName) Q_DECL_NOEXCEPT +bool qEnvironmentVariableIsEmpty(const char *varName) noexcept { QMutexLocker locker(&environmentMutex); #ifdef Q_CC_MSVC @@ -3445,9 +3482,7 @@ bool qEnvironmentVariableIsEmpty(const char *varName) Q_DECL_NOEXCEPT on the success of the conversion. Equivalent to - \code - qgetenv(varName).toInt(ok, 0) - \endcode + \snippet code/src_corelib_global_qglobal.cpp to-int except that it's much faster, and can't throw exceptions. \note there's a limit on the length of the value, which is sufficient for @@ -3457,7 +3492,7 @@ bool qEnvironmentVariableIsEmpty(const char *varName) Q_DECL_NOEXCEPT \sa qgetenv(), qEnvironmentVariable(), qEnvironmentVariableIsSet() */ -int qEnvironmentVariableIntValue(const char *varName, bool *ok) Q_DECL_NOEXCEPT +int qEnvironmentVariableIntValue(const char *varName, bool *ok) noexcept { static const int NumBinaryDigitsPerOctalDigit = 3; static const int MaxDigitsForOctalInt = @@ -3521,14 +3556,12 @@ int qEnvironmentVariableIntValue(const char *varName, bool *ok) Q_DECL_NOEXCEPT Returns whether the environment variable \a varName is set. Equivalent to - \code - !qgetenv(varName).isNull() - \endcode + \snippet code/src_corelib_global_qglobal.cpp is-null except that it's potentially much faster, and can't throw exceptions. \sa qgetenv(), qEnvironmentVariable(), qEnvironmentVariableIsEmpty() */ -bool qEnvironmentVariableIsSet(const char *varName) Q_DECL_NOEXCEPT +bool qEnvironmentVariableIsSet(const char *varName) noexcept { QMutexLocker locker(&environmentMutex); #ifdef Q_CC_MSVC @@ -3699,37 +3732,21 @@ bool qunsetenv(const char *varName) Its main use in Qt is to prevent implicitly-shared Qt containers from detaching: - \code - QString s = ...; - for (QChar ch : s) // detaches 's' (performs a deep-copy if 's' was shared) - process(ch); - for (QChar ch : qAsConst(s)) // ok, no detach attempt - process(ch); - \endcode + \snippet code/src_corelib_global_qglobal.cpp as-const-0 Of course, in this case, you could (and probably should) have declared \c s as \c const in the first place: - \code - const QString s = ...; - for (QChar ch : s) // ok, no detach attempt on const objects - process(ch); - \endcode + \snippet code/src_corelib_global_qglobal.cpp as-const-1 but often that is not easily possible. It is important to note that qAsConst() does not copy its argument, it just performs a \c{const_cast<const T&>(t)}. This is also the reason why it is designed to fail for rvalues: The returned reference would go stale too soon. So while this works (but detaches the returned object): - \code - for (QChar ch : funcReturningQString()) - process(ch); // OK, the returned object is kept alive for the loop's duration - \endcode + \snippet code/src_corelib_global_qglobal.cpp as-const-2 this would not: - \code - for (QChar ch : qAsConst(funcReturningQString())) - process(ch); // ERROR: ch is copied from deleted memory - \endcode + \snippet code/src_corelib_global_qglobal.cpp as-const-3 To prevent this construct from compiling (and failing at runtime), qAsConst() has a second, deleted, overload which binds to rvalues. @@ -3742,10 +3759,7 @@ bool qunsetenv(const char *varName) \overload This overload is deleted to prevent a dangling reference in code like - \code - for (QChar ch : qAsConst(funcReturningQString())) - process(ch); // ERROR: ch is copied from deleted memory - \endcode + \snippet code/src_corelib_global_qglobal.cpp as-const-4 */ /*! @@ -3858,7 +3872,7 @@ bool qunsetenv(const char *varName) dependent delayed translation in the given \a context with the given \a comment. The \a context is typically a class and also needs to be specified - as a string literal. The string literal \a disambiguation should be + as a string literal. The string literal \a comment should be a short semantic tag to tell apart otherwise identical strings. The macro tells lupdate to collect the string, and expands to an @@ -4103,6 +4117,13 @@ bool qunsetenv(const char *varName) Example of a movable type: \snippet code/src_corelib_global_qglobal.cpp 39 + + Qt will try to detect the class of a type using std::is_trivial or + std::is_trivially_copyable. Use this macro to tune the behavior. + For instance many types would be candidates for Q_MOVABLE_TYPE despite + not being trivially-copyable. For binary compatibility reasons, QList + optimizations are only enabled if there is an explicit + Q_DECLARE_TYPEINFO even for trivially-copyable types. */ /*! @@ -4679,9 +4700,7 @@ bool QInternal::activateCallbacks(Callback cb, void **parameters) purpose. It either expands to \c expr (if Qt is compiled without exception support or the compiler supports C++11 noexcept semantics) or to - \code - try { expr; } catch(...) { qTerminate(); } - \endcode + \snippet code/src_corelib_global_qglobal.cpp qterminate otherwise. Since this macro expands to just \c expr if the compiler supports @@ -4751,10 +4770,7 @@ bool QInternal::activateCallbacks(Callback cb, void **parameters) The macro goes at the end of the function, usually after the \c{const}, if any: - \code - // generate error if this doesn't actually override anything: - virtual void MyWidget::paintEvent(QPaintEvent*) Q_DECL_OVERRIDE; - \endcode + \snippet code/src_corelib_global_qglobal.cpp qdecloverride \sa Q_DECL_FINAL */ @@ -4776,18 +4792,11 @@ bool QInternal::activateCallbacks(Callback cb, void **parameters) The macro goes at the end of the function, usually after the \c{const}, if any: - \code - // more-derived classes no longer permitted to override this: - virtual void MyWidget::paintEvent(QPaintEvent*) Q_DECL_FINAL; - \endcode + \snippet code/src_corelib_global_qglobal.cpp qdeclfinal-1 For classes, it goes in front of the \c{:} in the class definition, if any: - \code - class QRect Q_DECL_FINAL { // cannot be derived from - // ... - }; - \endcode + \snippet code/src_corelib_global_qglobal.cpp qdeclfinal-2 \sa Q_DECL_OVERRIDE */ |