class QList<QString> has no member named 'emplace_back'

[mortem]

Hello,
I'm getting this problem
class QList<QString> has no member named 'emplace_back'

for code
QList<QString> list;
list.emplace_back("string");

Other members like append and such seem to work as intended. There is no emplaceBack() either however. Any help is much appreciated!

QTVersion: 6.8.2
QTCreator: 15.0.1

I made sure that I have QT6 by appending QStringView to a QString and it worked fine. All my kits have 6.8.2. Pressing F2 to go the header file shows that there is no emplace anything in there.

[JonB]

@mortem said in class QList<QString> has no member named 'emplace_back':

There is no emplaceBack() either however

template <typename... Args> QList<T>::reference QList::emplaceBack(Args &&... args)

Are you saying that does not compile?

[SGaist]

Hi,

It looks like there's something off with your sources. The methods have been available since 5.15 and the current dev branch has them as well.

[mortem]

Ok I fixed it somehow in CMakeLists. CMakeLists.txt had

find_package(QT NAMES Qt6 Qt5 REQUIRED COMPONENTS Widgets)

1. I removed Qt5 from there
2. set(PROJECT_SOURCES did NOT have the files I had added while building the program. They were being added later in the else-clause in cmake logic so I added the missing ones to PROJECT_SOURCES. The code below was the situation before the fix

set(PROJECT_SOURCES
        main.cpp
        mainwindow.cpp
        mainwindow.h
        mainwindow.ui
)
if(${QT_VERSION_MAJOR} GREATER_EQUAL 6)
    qt_add_executable(Gridlink
        MANUAL_FINALIZATION
        ${PROJECT_SOURCES}
    )
# Define target properties for Android with Qt 6 as:
#    set_property(TARGET Gridlink APPEND PROPERTY QT_ANDROID_PACKAGE_SOURCE_DIR
#                 ${CMAKE_CURRENT_SOURCE_DIR}/android)
# For more information, see https://doc.qt.io/qt-6/qt-add-executable.html#target-creation
else()
    if(ANDROID)
        add_library(Gridlink SHARED
            ${PROJECT_SOURCES}
        )
# Define properties for Android with Qt 5 after find_package() calls as:
#    set(ANDROID_PACKAGE_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/android")
    else()
        add_executable(Gridlink
            ${PROJECT_SOURCES}
            searchview.h searchview.cpp searchview.ui
            mpd_communication.h mpd_communication.cpp
            libraryview.h libraryview.cpp libraryview.ui
            artistview.h artistview.cpp artistview.ui
            albumview.h albumview.cpp albumview.ui
            datahandler.h datahandler.cpp
            config.h config.cpp
            song.h song.cpp
            album.h album.cpp
        )
    endif()
endif()