redefinition of inline function in class
We know an ordinary member function can not be defined multiple times. Suppose you have the following 3 files a.h, a.cpp, and main.cpp: //a.h #ifndef A_H #define A_H #include <iostream> […]
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QSqlDatabase: QMYSQL driver not loaded
Today, I ran a program that connects to a database, then a window popped up: Meanwhile, the following error appeared on the console: QSqlDatabase: QMYSQL driver not loaded QSqlDatabase: available […]
What .prf files are automatically loaded by qmake?
You may wonder why the qmake CONFIG variable has values that you never set. Sometimes, you even need to remove some values from CONFIG in your .pro file using: CONFIG […]
How does Qt Creator interact with debugger GDB?
You may never notice the interaction between Qt Creator and the GDB debugger in the past. The communication between Qt Creator and GDB is hidden well. You are supposed to […]
How to check the version of Qt a program is built on?
If you got an app that was built with Qt lib, how do you get the version of Qt? Suppose you only have the .exe file, you have not the […]
Python Lambda
What is lambda in Python? First, it is an expression, so called lambda expression. The expression evaluates to the value after the colon. Since it’s an expression, it can occur […]
GDB call function
You can call a function of the debugged inferior in GDB CLI. Suppose you have a program: #include <stdio.h> void sayhi() { printf(“hi\n”); } int main() { printf(“hello world\n”); sayhi(); […]
Qt Pretty Printers
Qt Creator loads the GDB pretty printers in the following manner. First, it imports the gdbbridge module by running the following gdb command. python from gdbbridge import * The file […]
use python in gdb
Believe or not, you can run python code in GDB. (gdb) python print(“hello world”) &”python print(\”hello world\”)\n” ~”hello world\n” ^done (gdb) In the above example, we call the python function […]
How to disable all optimizations for gcc?
You may think all the optimisations are turned off thoroughly if you do not provide the -O option for gcc. But according to this post, if you do not give […]