QSharedPointer Demo示例， 基于VS2019+ Qt5.15

QT_SYSROOT: QT_INSTALL_PREFIX:C:/Qt/5.15.2/msvc2019_64 QT_INSTALL_ARCHDATA:C:/Qt/5.15.2/msvc2019_64 QT_INSTALL_DATA:C:/Qt/5.15.2/msvc2019_64 QT_INSTALL_DOCS:C:/Qt/Docs/Qt-5.15.2 QT_INSTALL_HEADERS:C:/Qt/5.15.2/msvc2019_64/include QT_INSTALL_LIBS:C:/Qt/5.15.2/msvc2019_64/lib QT_INSTALL_LIBEXECS:C:/Qt/5.15.2/msvc2019_64/bin QT_INSTALL_BINS:C:/Qt/5.15.2/msvc2019_64/bin QT_INSTALL_TESTS:C:/Qt/5.15.2/msvc2019_64/tests QT_INSTALL_PLUGINS:C:/Qt/5.15.2/msvc2019_64/plugins QT_INSTALL_IMPORTS:C:/Qt/5.15.2/msvc2019_64/imports QT_INSTALL_QML:C:/Qt/5.15.2/msvc2019_64/qml QT_INSTALL_TRANSLATIONS:C:/Qt/5.15.2/msvc2019_64/translations QT_INSTALL_CONFIGURATION: QT_INSTALL_EXAMPLES:C:/Qt/Examples/Qt-5.15.2 QT_INSTALL_DEMOS:C:/Qt/Examples/Qt-5.15.2 QT_HOST_PREFIX:C:/Qt/5.15.2/msvc2019_64 QT_HOST_DATA:C:/Qt/5.15.2/msvc2019_64 QT_HOST_BINS:C:/Qt/5.15.2/msvc2019_64/bin QT_HOST_LIBS:C:/Qt/5.15.2/msvc2019_64/lib QMAKE_SPEC:win32-msvc QMAKE_XSPEC:win32-msvc QMAKE_VERSION:3.1 QT_VERSION:5.15.2