Re: difference between

[Jussi Lahtinen <jussi.lahtinen@xxxxxxxxx>]

Operator or function...


Jussi

On Sat, Oct 10, 2026 at 3:45 PM Jussi Lahtinen <jussi.lahtinen@xxxxxxxxx>
wrote:

> Benoit, is it possible to make compiler check if boolean value is compared
> to NULL or any other non-boolean? Or rather if operator returning only
> boolean is checked against non-boolean?
> It would catch bugs like in this thread.
>
> Jussi
>
> On Sat, Oct 10, 2026 at 3:36 PM Jussi Lahtinen <jussi.lahtinen@xxxxxxxxx>
> wrote:
>
>> But this is much better:
>> If IsNull(PictureBoxQRCode.Image) = False Then
>>
>>
>> Jussi
>>
>>
>> On Sat, Oct 10, 2026 at 3:33 PM Jussi Lahtinen <jussi.lahtinen@xxxxxxxxx>
>> wrote:
>>
>>> Avoid extra "Not", it makes reading the code confusing.
>>> You can fix it this way:
>>>
>>> If Not (PictureBoxQRCode.Image = Null) Then.
>>>
>>>
>>> Jussi
>>>
>>>
>>> On Sat, Oct 10, 2026 at 9:43 AM valaquarus <valaquarus@xxxxxxxxx> wrote:
>>>
>>>> Hello,
>>>> what are the differences between these two assertions, because they
>>>> don't act exactly the same way :
>>>>
>>>> - If Not PictureBoxQRCode.Image = Null Then...
>>>> - If Not IsNull(PictureBoxQRCode.Image) Then...
>>>>
>>>>
>>>> [System]
>>>> Gambas=3.22.99 2992226 (master)
>>>> OperatingSystem=Linux
>>>> Distribution=Manjaro Linux
>>>> Kernel=7.2.3-2-MANJARO
>>>> Architecture=x86_64
>>>> Cores=4
>>>> Memory=5713M
>>>> Language=fr_FR.UTF-8
>>>> Platform=x11
>>>> Desktop=KDE
>>>> DesktopResolution=96
>>>> DesktopScale=9
>>>> WidgetTheme=breeze
>>>> Font=Adwaita Mono,12
>>>> DarkTheme=False
>>>> [Programs]
>>>> appimage-builder=appimage-builder: 1.1.1.dev32+g2709a3b
>>>> clang=clang version 22.1.8
>>>> dpkg=Programme « dpkg » de gestion de paquets Debian version
>>>> 1.23.7-dirty (amd64).
>>>> gcc=gcc (GCC) 16.2.1 20260810
>>>> git=git version 2.55.0
>>>> msgmerge=msgmerge (GNU gettext-tools) 1.0
>>>> pngquant=3.0.3
>>>> rpmbuild=RPM version 6.0.1
>>>> trans=Translate Shell 0.9.7.1-git:dc67af4
>>>> [Libraries]
>>>> Cairo=libcairo.so.2.11804.4
>>>> Curl=libcurl.so.4.8.0
>>>> DBus=libdbus-1.so.3.38.3
>>>> GDK2=libgdk-x11-2.0.so.0.2400.33
>>>> GDK3=libgdk-3.so.0.2420.32
>>>> GStreamer=libgstreamer-1.0.so.0.2806.0
>>>> GTK+2=libgtk-x11-2.0.so.0.2400.33
>>>> GTK+3=libgtk-3.so.0.2420.32
>>>> OpenGL=libGL.so.1.7.0
>>>> Poppler=libpoppler.so.163.0.0
>>>> QT5=libQt5Core.so.5.15.19
>>>> QT6=libQt6Core.so.6.11.2
>>>> RSvg=librsvg-2.so.2.62.3
>>>> SDL=libSDL2-2.0.so.0.3200.72
>>>> SQLite3=libsqlite3.so.3.53.4
>>>> [Environment]
>>>> DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus
>>>> DEBUGINFOD_URLS=https://debuginfod.archlinux.org
>>>> DESKTOP_SESSION=/usr/share/xsessions/plasmax11.desktop
>>>> DISPLAY=:0
>>>> DOCKER_HOST=unix:///run/user/1000/podman/podman.sock
>>>> GB_GUI=gb.gtk3
>>>>
>>>> GTK2_RC_FILES=/etc/gtk-2.0/gtkrc:<home>/.gtkrc-2.0:<home>/.config/gtkrc-2.0
>>>> GTK_MODULES=canberra-gtk-module
>>>> GTK_RC_FILES=/etc/gtk/gtkrc:<home>/.gtkrc:<home>/.config/gtkrc
>>>> HOME=<home>
>>>> ICEAUTHORITY=/run/user/1000/iceauth_IlqFFb
>>>> INVOCATION_ID=41b15739ce1c46eb9a1566475fbf9362
>>>> JOURNAL_STREAM=10:13404
>>>> KDE_APPLICATIONS_AS_SCOPE=1
>>>> KDE_FULL_SESSION=true
>>>> KDE_SESSION_UID=1000
>>>> KDE_SESSION_VERSION=6
>>>> LANG=fr_FR.UTF-8
>>>> LANGUAGE=fr_FR.UTF-8
>>>> LOGNAME=<user>
>>>> MAIL=/var/spool/mail/<user>
>>>> MANAGERPID=826
>>>> MANAGERPIDFDID=8436
>>>>
>>>> MEMORY_PRESSURE_WATCH=/sys/fs/cgroup/user.slice/user-1000.slice/user@1000.service
>>>> /session.slice/plasma-plasmashell.service/memory.pressure
>>>> MEMORY_PRESSURE_WRITE=c29tZSAyMDAwMDAgMjAwMDAwMAA=
>>>> MOTD_SHOWN=pam
>>>> OLDPWD=<home>
>>>> PAM_KWALLET5_LOGIN=/run/user/1000/kwallet5.socket
>>>>
>>>> PATH=<home>/.local/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/var/lib/flatpak/exports/bin:/usr/lib/jvm/default/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl:/usr/lib/rustup/bin
>>>> PWD=<home>
>>>> QT_LINUX_ACCESSIBILITY_ALWAYS_ON=1
>>>> QT_LOGGING_RULES=*.debug=false
>>>> QT_QPA_PLATFORM=xcb
>>>>
>>>> QT_SCREEN_SCALE_FACTORS=LVDS-1=1;VGA-1=1;HDMI-1=1;DP-1=1;HDMI-2=1;HDMI-3=1;DP-2=1;DP-3=1;
>>>> QT_WAYLAND_RECONNECT=1
>>>>
>>>> SESSION_MANAGER=local/<hostname>:@/tmp/.ICE-unix/969,unix/<hostname>:/tmp/.ICE-unix/969
>>>> SHELL=/usr/bin/zsh
>>>> SYSTEMD_EXEC_PID=981
>>>> TZ=:/etc/localtime
>>>> USER=<user>
>>>>
>>>> VSSCRIPT_PATH=/usr/lib/python3.14/site-packages/vapoursynth/libvsscript.so
>>>> XAUTHORITY=/run/user/1000/xauth_cjAxZJ
>>>>
>>>> XDG_CONFIG_DIRS=<home>/.config/kdedefaults:/etc/xdg:/usr/share/manjaro-kde-settings/xdg
>>>> XDG_CURRENT_DESKTOP=KDE
>>>>
>>>> XDG_DATA_DIRS=<home>/.local/share/flatpak/exports/share:/var/lib/flatpak/exports/share:/usr/local/share:/usr/share
>>>> XDG_MENU_PREFIX=plasma-
>>>> XDG_RUNTIME_DIR=/run/user/1000
>>>> XDG_SEAT=seat0
>>>> XDG_SEAT_PATH=/org/freedesktop/DisplayManager/Seat0
>>>> XDG_SESSION_CLASS=user
>>>> XDG_SESSION_DESKTOP=KDE
>>>> XDG_SESSION_ID=2
>>>> XDG_SESSION_PATH=/org/freedesktop/DisplayManager/Session1
>>>> XDG_SESSION_TYPE=x11
>>>> XDG_VTNR=2
>>>>
>>>>
>>>> Good day to all of you
>>>>
>>>> --
>>>>
>>>> valaquarus <valaquarus@xxxxxxxxx>
>>>>
>>>