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Cleanup: unify idiosyncratic singletons

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The way we handle singletons in QML, QML insists on allocating the
objects. This leads to a very idiosyncratic way of handling
singletons: The global instance pointer is set in the constructor.

Unify all these by implementing a "SillySingleton" template. All
of the weird singleton-classes can derive from this template and
don't have to bother with reimplementing the instance() function
with all the safety-checks, etc.

This serves firstly as documentation but also improves debugging
as we will now see wanted and unwanted creation and destruction
of these weird singletons.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2019-09-22 14:33:33 +02:00 • committed by Dirk Hohndel
parent f20d6187f0
commit 05200f9266
13 changed files with 86 additions and 89 deletions
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17
mobile-widgets/qmlprefs.cpp
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@ -8,30 +8,13 @@
/*** Global and constructors ***/
QMLPrefs *QMLPrefs::m_instance = NULL;
QMLPrefs::QMLPrefs() :
m_credentialStatus(qPrefCloudStorage::CS_UNKNOWN),
m_oldStatus(qPrefCloudStorage::CS_UNKNOWN),
m_showPin(false)
{
// This strange construct is needed because QMLEngine calls new and that
// cannot be overwritten
if (!m_instance)
m_instance = this;
}
QMLPrefs::~QMLPrefs()
{
m_instance = NULL;
}
QMLPrefs *QMLPrefs::instance()
{
return m_instance;
}
/*** public functions ***/
const QString QMLPrefs::cloudPassword() const
{