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std::vector<QWidget*> daytask_widget_vec;
QWidget* daytask_widget;
 
auto index = std::find(daytask_widget_vec.begin(), daytask_widget_vec.end(), daytask_widget);
if (index != daytask_widget_vec.end()) {
    QWidget* tmp_widget = *index;
    index = daytask_widget_vec.erase(index);
    delete tmp_widget;
}
 
//ошибочка

prog.cpp:1:6: error: ‘vector’ in namespace ‘std’ does not name a template type
 std::vector<QWidget*> daytask_widget_vec;
      ^~~~~~
prog.cpp:2:1: error: ‘QWidget’ does not name a type
 QWidget* daytask_widget;
 ^~~~~~~
prog.cpp:4:14: error: ‘find’ is not a member of ‘std’
 auto index = std::find(daytask_widget_vec.begin(), daytask_widget_vec.end(), daytask_widget);
              ^~~
prog.cpp:4:24: error: ‘daytask_widget_vec’ was not declared in this scope
 auto index = std::find(daytask_widget_vec.begin(), daytask_widget_vec.end(), daytask_widget);
                        ^~~~~~~~~~~~~~~~~~
prog.cpp:4:52: error: ‘daytask_widget_vec’ was not declared in this scope
 auto index = std::find(daytask_widget_vec.begin(), daytask_widget_vec.end(), daytask_widget);
                                                    ^~~~~~~~~~~~~~~~~~
prog.cpp:4:78: error: ‘daytask_widget’ was not declared in this scope
 auto index = std::find(daytask_widget_vec.begin(), daytask_widget_vec.end(), daytask_widget);
                                                                              ^~~~~~~~~~~~~~
prog.cpp:5:1: error: expected unqualified-id before ‘if’
 if (index != daytask_widget_vec.end()) {
 ^~

Standard output is empty