Unsolved Using more standard library function
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Please use code tags when posting on the forums, otherwise the code is very hard to read:
``` // Some code here ```
You are seeing the error because your
notesmanager.h
does not includenote.h
header. You should add:#include "note.h"
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Several errors occurred while copying, the characters "<" and ">" confuse my editor,
parts of functions were assigned incorrectly. -
@sowas said in Using more standard library function:
Several errors occurred while copying, the characters "<" and ">" confuse my editor,
parts of functions were assigned incorrectly.What's that got to do with the topic? I don't understand.
Did inclusion of
note.h
innotesmanager.h
solve the problem? -
@sowas what version of Qt do you use for your kit? You only posted the one that was used to compile QtCreator.
Depending on the kit, qmake may not know the c++17 command
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@J.Hilk
The Kits-Menu-
Kits
automatic: Qt 5.12.9 GCC64bit
Users: (Dektop default)
C: GCC(C, x86 64bit in /usr/bin/
C++: GCC9 (C++, x86 64bit in /usr/bin/
Qt-Version Qt 5.12.8(qt5) -
Qt-Versions
automatic: Qt 5.12.9 GCC64bit /home/user/Qt12/5.12.9/gcc_64/bin/qmake.
user: Qt 5.12.8(qt5) /usr/lib/qt5/bin/qmake -
Compiler
Name: Clang(C,x86 64bit in /home/user/Qt15/Tools/QtCreator/libexec/qtcreator/clng/bin)
Compiler-path: /home/user/Qt15/Tools/QtCreator/libexec/qtcreator/clang/bin/clang -
Debbuger ...
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CMake ...
According to Creator Info (4.13.2) : Qt 5.15.1 (GCC 5.3.1 20160406 (Red Hat 5.3.1-6),64 bit
readable version of codenow a readable code:
// notes.pro //////////// QT += core gui greaterThan(QT_MAJOR_VERSION, 4): QT += widgets CONFIG += c++17 # You can make your code fail to compile if it uses deprecated APIs. # In order to do so, uncomment the following line. #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0 SOURCES += \ main.cpp \ mainwindow.cpp \ noteslistwidget.cpp \ notesmanager.cpp \ notewidget.cpp HEADERS += \ mainwindow.h \ note.h \ noteslistwidget.h \ notesmanager.h \ notewidget.h FORMS += \ mainwindow.ui \ noteslistwidget.ui # Default rules for deployment. qnx: target.path = /tmp/$${TARGET}/bin else: unix:!android: target.path = /opt/$${TARGET}/bin !isEmpty(target.path): INSTALLS += target // main.cpp /////////// #include "mainwindow.h" #include "notesmanager.h" #include <QApplication> int main(int argc, char *argv[]) { QApplication::setAttribute(Qt::AA_UseHighDpiPixmaps, true); QApplication::setAttribute(Qt::AA_EnableHighDpiScaling,true); QApplication a(argc, argv); NotesManager manager; MainWindow w(manager); w.show(); return a.exec(); } //mainwindow.cpp //////////////// #include "mainwindow.h" #include "ui_mainwindow.h" #include "notesmanager.h" #include "note.h" #include "noteslistwidget.h" #include <QPushButton> #include <QMessageBox> #include <algorithm> MainWindow::MainWindow(NotesManager &manager, QWidget *parent) : QWidget(parent) , ui(new Ui::MainWindow) , notesManager(manager) { ui->setupUi(this); makeConnections(); init(); } MainWindow::~MainWindow() { delete ui; } void MainWindow::on_newNoteBtn_clicked() { notesManager.createNewNote(); } void MainWindow::on_removeNoteBtn_clicked() { removeNote(ui->notesListWidget->currentNoteId()); } // handle NotesManager signals void MainWindow::onNewNoteCreated(int id) { addNoteToList(notesManager.note(id)); } void MainWindow::onNoteContentChanged(int id) { ui->notesListWidget->updateCurrentNote(notesManager.note(id)); } // handle NotesListWidget signals void MainWindow::onSelectedNoteChanged(int id) { auto *document = notesManager.noteDocument(id); if(document) { ui->textEdit->setDocument(document); // auto cursor = ui->textEdit->textCursor(); // cursor.movePosition(QTextCursor::End); // ui->textEdit->setTextCursor(cursor); } } void MainWindow::onRemoveNote(int id) { removeNote(id); } void MainWindow::addNoteToList(const Note ¬e) { ui->notesListWidget->addNote(note); } void MainWindow::removeNote(int id) { QString noteTitle = notesManager.note(id).title; auto pressedBtn = QMessageBox::information(this,"remove note?", QString("Are you sure you want to remove %0?").arg(noteTitle), QMessageBox::Yes|QMessageBox::No,QMessageBox::Yes); if(pressedBtn == QMessageBox::Yes) { if(notesManager.count() ==1) ui->textEdit->setDocument(nullptr); ui->notesListWidget->removeCurrentNote(); notesManager.removeNote(id); } } void MainWindow::init() { auto notesList = notesManager.noteCollection(); std::sort(notesList.begin(), notesList.end(), [](const Note &left, const Note &right) { return left.lastModified < right.lastModified; }); for(auto ¬e : notesList) addNoteToList(note); } void MainWindow::makeConnections() { connect(ui->newNoteBtn, &QPushButton::click, this, &MainWindow::on_newNoteBtn_clicked); connect(ui->removeNoteBtn, &QPushButton::click, this, &MainWindow::on_removeNoteBtn_clicked); connect(¬esManager, &NotesManager::newNoteCreated,this, &MainWindow::onNewNoteCreated); connect(¬esManager, &NotesManager::noteContendChanged, this, &MainWindow::onNoteContentChanged); connect(ui->notesListWidget, &NotesListWidget::selectedNoteChanged, this, &MainWindow::onSelectedNoteChanged); } //MainWindow.h ////////////// #ifndef MAINWINDOW_H #define MAINWINDOW_H #include <QWidget> #include <QPushButton> QT_BEGIN_NAMESPACE namespace Ui { class MainWindow; } QT_END_NAMESPACE class NotesManager; class Note; class MainWindow : public QWidget { Q_OBJECT public: MainWindow(NotesManager &manageNr, QWidget *parent = nullptr); ~MainWindow(); private slots: // handle signal for ui void on_newNoteBtn_clicked(); void on_removeNoteBtn_clicked(); // handle NotesManager signals void onNewNoteCreated(int id); void onNoteContentChanged(int id); // handle NotesListWidget signals void onSelectedNoteChanged(int id); void onRemoveNote(int id); private: void addNoteToList(const Note ¬e); void removeNote(int id); void init(); void makeConnections(); Ui::MainWindow *ui; NotesManager ¬esManager; }; #endif // MAINWINDOW_H //mainwindow.ui /////////////// <?xml version="1.0" encoding="UTF-8"?> <ui version="4.0"> <class>MainWindow</class> <widget class="QWidget" name="MainWindow"> <property name="geometry"> <rect> <x>0</x> <y>0</y> <width>800</width> <height>600</height> </rect> </property> <property name="windowTitle"> <string>MainWindow</string> </property> <layout class="QVBoxLayout" name="verticalLayout" stretch="0,1"> <item> <layout class="QHBoxLayout" name="horizontalLayout"> <item> <widget class="QPushButton" name="newNoteBtn"> <property name="text"> <string>New</string> </property> </widget> </item> <item> <widget class="QPushButton" name="removeNoteBtn"> <property name="text"> <string>Delete</string> </property> </widget> </item> <item> <spacer name="horizontalSpacer"> <property name="orientation"> <enum>Qt::Horizontal</enum> </property> <property name="sizeHint" stdset="0"> <size> <width>40</width> <height>20</height> </size> </property> </spacer> </item> </layout> </item> <item> <widget class="QSplitter" name="splitter"> <property name="orientation"> <enum>Qt::Horizontal</enum> </property> <property name="childrenCollapsible"> <bool>false</bool> </property> <widget class="NotesListWidget" name="notesListWidget" native="true"/> <widget class="QTextEdit" name="textEdit"/> </widget> </item> </layout> </widget> <customwidgets> <customwidget> <class>NotesListWidget</class> <extends>QWidget</extends> <header>noteslistwidget.h</header> <container>1</container> </customwidget> </customwidgets> <resources/> <connections/> </ui> //note.h //////// #pragma once #include <QString> #include <QDateTime> struct Note { int id; QString title; QString content; QDateTime lastModified; }; //noteslistwidget.cpp /////////////////// #include "noteslistwidget.h" #include "ui_noteslistwidget.h" #include "note.h" NotesListWidget::NotesListWidget(QWidget *parent) : QWidget(parent), ui(new Ui::NotesListWidget) { ui->setupUi(this); connect(ui->noteList, &QListWidget::itemSelectionChanged, this, &NotesListWidget::onItemSlectionChanged); } NotesListWidget::~NotesListWidget() { delete ui; } void NotesListWidget::addNote(const Note ¬e) { auto *item = new QListWidgetItem(); ui->noteList->insertItem(0, item); setupNoteItem(note, item); } void NotesListWidget::removeCurrentNote() { auto *currentItem = ui->noteList->currentItem(); if(currentItem != nullptr) { delete currentItem; } } void NotesListWidget::updateCurrentNote(const Note ¬e) { if(ui->noteList->currentRow() !=0 ) { moveCurrenItemToTop(note); } } int NotesListWidget::currentNoteId() { auto *currentItem = ui->noteList->currentItem(); int noteId =currentItem->data(Qt::UserRole).toInt(); return noteId; } void NotesListWidget::onItemSlectionChanged() { auto *currentItem = ui->noteList->currentItem(); if(currentItem) { int id = currentNoteId(); emit selectedNoteChanged(id); } } void NotesListWidget::moveCurrenItemToTop(const Note ¬e) { blockSignals(true); auto *item = ui->noteList->takeItem(ui->noteList->currentRow()); ui->noteList->insertItem(0,item); setupNoteItem(note, item); blockSignals(false); } void NotesListWidget::setupNoteItem(const Note ¬e, QListWidgetItem *item) { item->setText(note.title); item->setData(Qt::UserRole, note.id); ui->noteList->setCurrentItem(item); } // notesListWidget.h //////////////////// #pragma once #include <QWidget> namespace Ui { class NotesListWidget; } struct Note; class QListWidgetItem; class NotesListWidget : public QWidget { Q_OBJECT public: explicit NotesListWidget(QWidget *parent = nullptr); ~NotesListWidget(); void addNote(const Note ¬e); void removeCurrentNote(); void updateCurrentNote(const Note ¬e); int currentNoteId(); signals: void selectedNoteChanged(int id); private: void onItemSlectionChanged(); void moveCurrenItemToTop(const Note ¬e); void setupNoteItem(const Note ¬e, QListWidgetItem *item); private: Ui::NotesListWidget *ui; }; //noteslistwidget.ui //////////////////// <?xml version="1.0" encoding="UTF-8"?> <ui version="4.0"> <class>NotesListWidget</class> <widget class="QWidget" name="NotesListWidget"> <property name="geometry"> <rect> <x>0</x> <y>0</y> <width>261</width> <height>579</height> </rect> </property> <property name="windowTitle"> <string>Form</string> </property> <layout class="QVBoxLayout" name="verticalLayout"> <item> <widget class="QListWidget" name="noteList"/> </item> </layout> </widget> <resources/> <connections/> </ui> //notesmanager.cpp ////////////////// #include "notesmanager.h" #include "note.h" #include <QTextDocument> #include <QSignalMapper> int nextNoteId(); NotesManager::NotesManager(QObject *parent) : QObject(parent) { mapChangedSignalToNoteId = new QSignalMapper(this); connect(mapChangedSignalToNoteId, &QSignalMapper::mappedInt, this, &NotesManager::onNoteContentChanged); readNotes(); if(notes.size() ==0) createNewNote(); } NotesManager::~NotesManager() { writeNotes(); } void NotesManager::createNewNote() { int id = nextNoteId(); auto &[note, textDocument] = notes[id]; note.id = id; note.title = "new Note"; note.lastModified = QDateTime::currentDateTime(); textDocument = createNewTextDocument(note); emit newNoteCreated(id); } void NotesManager::removeNote(int id) { notes.erase(id); if(notes.empty()) createNewNote(); } void NotesManager::renameNote(int id, const QString &newTitle) { // todo // Q_UNUSED(id); // Q_UNUSED(newTitle); auto found = notes.find(id); if(found !=notes.end()) { auto &[note, textDocument] = found->second; note.title = newTitle; note.lastModified = QDateTime::currentDateTime(); } } const Note &NotesManager::note(int id) const { return notes.at(id).first; } QTextDocument *NotesManager::noteDocument(int id) const { auto found = notes.find(id); if(found != notes.end()) { return found->second.second.get(); } return nullptr; } std::vector<std::reference_wrapper<Note>>NotesManager::noteCollection() { std::vector<std::reference_wrapper<Note>> out; for(auto &i : notes) { auto &[note, QTextDocument] =i.second; note.content = QTextDocument.toPlainText(); out.push_back(note); } return out; } size_t NotesManager::count() const { return notes.size(); } void NotesManager::onNoteContentChanged(int id) { notes.at(id).first.lastModified =QDateTime::currentDateTime(); emit noteContendChanged(id); } void NotesManager::readNotes() { // todo } void NotesManager::writeNotes() { // todo } std::unique_ptr<QTextDocument> NotesManager::createNewTextDocument(const Note ¬e) { auto textDocument =std::make_unique<QTextDocument>(note.content); connect(textDocument.get(), &QTextDocument::contentsChange, mapChangedSignalToNoteId, qOverload<>(&QSignalMapper::map)); mapChangedSignalToNoteId->setMapping(textDocument.get(),note.id); return textDocument; } int nextNoteId() { static int id = 0; return ++id; } //notesmanager.h //////////////// #pragma once #include <QObject> #include <unordered_map> #include <vector> #include <utility> #include <memory> struct Note; class QTextDocument; class QSignalMapper; class NotesManager : public QObject { Q_OBJECT public: explicit NotesManager(QObject *parent = nullptr);readable version of code ~NotesManager(); void createNewNote(); void removeNote(int id); void renameNote(int id, const QString &newTitle); const Note ¬e(int id) const; QTextDocument *noteDocument(int id) const; std::vector<std::reference_wrapper<Note>> noteCollection(); size_t count() const; signals: void newNoteCreated(int id); void noteContendChanged(int id); private: void onNoteContentChanged(int id); void readNotes(); void writeNotes(); std::unique_ptr<QTextDocument> createNewTextDocument(const Note ¬e); private: std::unordered_map<int, std::pair<Note, std::unique_ptr<QTextDocument>>> notes; QSignalMapper *mapChangedSignalToNoteId =nullptr; }; ////////////////////// // end notes.cpp
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@sowas said in Using more standard library function:
According to Creator Info (4.13.2) : Qt 5.15.1 (GCC 5.3.1 20160406 (Red Hat 5.3.1-6),64 bit
This is Qt version which was used to build QtCreator and doesn't matter here.
What you are using is 5.12.9Under "3. Compiler" you should also have GCC/G++, do you? Which version is that compiler?
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@jsulm
attached a screenshot of my monitor
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@sowas
ok, Qt 5.12 should support c++17to exclude the compiler check what this program outputs:
#include <iostream> int main (int argc, char *argv[]) { std::cout << "C++ Version: " << __cplusplus << std::endl; }
it should be
C++ Version: 201703
or higher, to support c++17 -
@J.Hilk
regrettable the result is : C++ Version: 201103.
What can I do now? -
@jsulm said in Using more standard library function:
5.12.9
I think back then the config flag used to be
CONFIG += c++1z
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Well, historically speaking, compiler vendors did not update/maintain
that part of the c++ standard very well, so I would suggest you do what @sierdzio suggested, maybe the compiler is c++17 capable after all 🤷♂️After that, update your compiler, you're on linux IIRC, a platform I personally do not use, but it should be rather easy via a package manager of your trusting
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@jsulm said in Using more standard library function:
Yes, sorry. I clicked "quote" on the first post I saw with concrete Qt version.