write an bit into an unsign short array

[homeless]

Hi,

I try to write an bool Value into a member Atribute m_Value.
m_Value is an 32 word a 32 bits,
I think that means:

 unsigned short* m_Value;
or
 unsigned short m_Value[32];

The Function can look like that:

void CClass::setBoolValue(bool bValue,unsigned short WordNo,unsigned short BitPos){
	unsigned short WordNr = m_Value[WordNo]; 
}

 

[Salem]

I would expect

unsigned long m_Value[32];

void CClass::setBoolValue(bool bValue,unsigned short WordNo,unsigned short BitPos){
    unsigned long mask = (1ul<<BitPos);
    m_Value[WordNo] &= ~mask;    // clear a specific bit
    if ( bValue ) {
        m_Value[WordNo] |= mask; // set it, if flag is true
    }
}

--

 

[xwb]

How about

void CClass::setBoolValue(bool bValue,unsigned short BitPos){
    unsigned short WordNo = BitPos / 32;
    unsigned short bpos = BitPos & 0x1F;
    unsigned long mask = (1ul<<bpos);
    if ( bValue )
        m_Value[WordNo] |= mask; // set it, if flag is true
    else
       m_Value[WordNo] &= ~mask; // clear a specific bit
}

Then you can just set the relevant bit without worrying which word it is in unless you really want 32 words of 32 bits each.