Irrlicht Engine

Code: Select all

unisgned char flags = 0x00;

const unsigned char VSYNC      = 0x01;
const unsigned char FULLSCREEN = 0x02;
more...


void add(unsigned char option)
{
	flags |= option;
}

void remove(unsigned char option)
{
	flags &= ~option;
}

bool check(unsigned char option)
{
	return (( flags & option ) != 0);
}


Example :

add(VSYNC);
add(FULLSCREEN);
add(More..);

remove(some unused flag)

if( check(VSYNC) ) < -- returns always 0

Code: Select all

#include <iostream>

using namespace std;

unsigned char flags = 0x0;

const unsigned char VSYNC      = 0x1;
const unsigned char FULLSCREEN = 0x2;

void add(unsigned char option)
{
   flags |= option;
}

void remove(unsigned char option)
{
   flags &= ~option;
}

bool check(unsigned char option)
{
   return (( flags & option ) != 0);
}

void print(bool r)
{
    cout << check(r) <<endl;
}

void test1()
{
    cout << "TEST 1 - remove FULLSCREEN bit first" <<endl;
    add(FULLSCREEN);
    add(VSYNC);

    cout <<"[BEFORE] FS = " << check(FULLSCREEN) << " , VS = " <<check(VSYNC) <<endl;

    cout<<"[REMOVING]"<<endl;
    remove(FULLSCREEN);

    cout <<"[AFTER] FS = " << check(FULLSCREEN) << " , VS = " <<check(VSYNC) <<endl;
}

void test2()
{
    cout << "TEST 2 - remove VSYNC bit first" <<endl;
    add(FULLSCREEN);
    add(VSYNC);

    cout <<"[BEFORE] FS = " << check(FULLSCREEN) << " , VS = " <<check(VSYNC) <<endl;

    cout<<"[REMOVING]"<<endl;
    remove(VSYNC);

    cout <<"[AFTER] FS = " << check(FULLSCREEN) << " , VS = " <<check(VSYNC) <<endl;
}

void test3()
{
    cout << "TEST 3 - remove both" <<endl;
    add(FULLSCREEN);
    add(VSYNC);

    cout <<"[BEFORE] FS = " << check(FULLSCREEN) << " , VS = " <<check(VSYNC) <<endl;

    cout<<"[REMOVING]"<<endl;
    remove(VSYNC);

    cout<<"[REMOVING]"<<endl;
    remove(FULLSCREEN);

    cout <<"[AFTER] FS = " << check(FULLSCREEN) << " , VS = " <<check(VSYNC) <<endl;
}

int main()
{
    test1();
    cout<<endl<<endl;
    test2();
    cout<<endl<<endl;
    test3();
    cout<<endl<<endl;

    return 0;
}

Code: Select all

TEST 1 - remove FULLSCREEN bit first
[BEFORE] FS = 1 , VS = 1
[REMOVING]
[AFTER] FS = 0 , VS = 1


TEST 2 - remove VSYNC bit first
[BEFORE] FS = 1 , VS = 1
[REMOVING]
[AFTER] FS = 1 , VS = 0


TEST 3 - remove both
[BEFORE] FS = 1 , VS = 1
[REMOVING]
[REMOVING]
[AFTER] FS = 0 , VS = 0