diff options
| -rw-r--r-- | src/printsupport/kernel/qplatformprintplugin.cpp | 26 |
1 files changed, 19 insertions, 7 deletions
diff --git a/src/printsupport/kernel/qplatformprintplugin.cpp b/src/printsupport/kernel/qplatformprintplugin.cpp index 409de3eb4a..2c87fcc5e6 100644 --- a/src/printsupport/kernel/qplatformprintplugin.cpp +++ b/src/printsupport/kernel/qplatformprintplugin.cpp @@ -58,15 +58,27 @@ QPlatformPrinterSupportPlugin::~QPlatformPrinterSupportPlugin() { } +/*! + \internal + + Returns a lazily-initialized singleton. Ownership is granted to the + QPlatformPrinterSupportPlugin, which is never unloaded or destroyed until + application exit, i.e. you can expect this pointer to always be valid and + multiple calls to this function will always return the same pointer. +*/ QPlatformPrinterSupport *QPlatformPrinterSupportPlugin::get() { - QStringList k = loader()->keys(); - if (k.isEmpty()) - return 0; - QPlatformPrinterSupportPlugin *plugin = qobject_cast<QPlatformPrinterSupportPlugin *>(loader()->instance(k.first())); - if (!plugin) - return 0; - return plugin->create(k.first()); + static QPlatformPrinterSupport *singleton = 0; + if (!singleton) { + QStringList k = loader()->keys(); + if (k.isEmpty()) + return 0; + QPlatformPrinterSupportPlugin *plugin = qobject_cast<QPlatformPrinterSupportPlugin *>(loader()->instance(k.first())); + if (!plugin) + return 0; + singleton = plugin->create(k.first()); + } + return singleton; } QT_END_NAMESPACE |