passing by reference... my darkest enemy
actual reason below:
In your case (without reference) the compiler generates a temporary object (int) for the first argument of your MyApplication constructor. You pass this temporary int to QApplication’s constructor (with int reference), which saves the address of this reference. Once your MyApplication constructor is done the temporary int is destroyed but QApplication still has its address.
To compile and install you need:
- Qt >= 4.5
- FreePascal >= 2.2.4
- SDL >= 1.2.5
- SDL_net >= 1.2.5
- SDL_mixer >= 1.2
- SDL_image >= 1.2
- SDL_ttf >= 2.0
- CMake >= 2.6.0
- Lua >= 5.1.0
For server:
- Glasgow Haskell Compiler >= 6.10
- bytestring-show package
- dataenc package
- hslogger package
1. Configure:
$ cmake .
or
$ cmake -DCMAKE_BUILD_TYPE="Release" -DCMAKE_INSTALL_PREFIX="install_prefix" \
-DDATA_INSTALL_DIR="data_dir" .
add -DWITH_SERVER=1 to compile net server; if you have Qt installed but it is
not found you can set it up with -DQT_QMAKE_EXECUTABLE="path_to_qmake"
2. Compile:
$ make
3. Install:
# make install
That's all! Enjoy!