boo_1544.htm

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<HTML><HEAD><TITLE>Boolean Vectors</TITLE></HEAD>
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<P>&copy;Copyright 1996 Rogue Wave Software</P>
<H2>Boolean Vectors</H2>
<P>Vectors of bit values (boolean 1/0 values) are handled as a special case by the standard library, so that the values can be efficiently packed (several elements to a word).  The operations for a boolean vector , <B><I>vector&#60;bool></I></B>, are a superset of those for an ordinary vector, only the implementation is more efficient.</P>
<P>One new member function added to the boolean vector data type is <SAMP>flip().</SAMP>  When invoked, this function inverts all the bits of the vector.  Boolean vectors also return as reference an internal value that also supports the <SAMP>flip()</SAMP> member function.</P>
<PRE>   vector&#60;bool> bvec(27);
   bvec.flip();               // flip all values
   bvec[17].flip();           // flip bit 17</PRE>
<P><B><I>vector&#60;bool></I></B> also supports an additional <SAMP>swap()</SAMP> member function that allows you to swap the values indicated by a pair of references. </P>
<PRE>   bvec.swap(bvec [17], bvec [16]);</PRE>

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