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.
/*
This is an experimental main to use with hwLibary
- create the library with `cmake . -DBUILD_ENGINE_LIBRARY=1' and `make hwengine'
- compile this file with `gcc libhwLibrary.dylib libSDLmain.a wrapper.c -o wrapper -framework Cocoa -framework SDL'
(in Mac OS X, but this command line shouldn't be much different in other OSes; make sure to set the correct files/paths)
- this executable expect a save file "Save.hws" and the data folder "Data" to be in the same launching directory
*/
#include <stdlib.h>
extern void Game (const char **);
int SDL_main (int argc, const char **argv)
{
// Note: if you get a segfault or other unexpected crashes on startup
// make sure that these arguments are up-to-date with the ones actual needed
const char **gameArgs = (const char**) malloc(sizeof(char *) * 11);
gameArgs[ 0] = "0"; //ipcPort
gameArgs[ 1] = "1024"; //cScreenWidth
gameArgs[ 2] = "768"; //cScreenHeight
gameArgs[ 3] = "0"; //cReducedQuality
gameArgs[ 4] = "en.txt"; //cLocaleFName
gameArgs[ 5] = "wrapper"; //UserNick
gameArgs[ 6] = "1"; //isSoundEnabled
gameArgs[ 7] = "1"; //isMusicEnabled
gameArgs[ 8] = "1"; //cAltDamage
gameArgs[ 9] = "0.0"; //rotationQt
gameArgs[10] = "Save.hws"; //recordFileName
Game(gameArgs);
free(gameArgs);
return 0;
}