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<A NAME="PetscBT"><H1>PetscBT</H1></A>
PETSc bitarrays
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
typedef char* PetscBT;
</PRE>
<P>
PetscBTCreate(m,bt) - creates a bit array with enough room to hold m values
PetscBTDestroy(bt) - destroys the bit array
PetscBTMemzero(m,bt) - zeros the entire bit array (sets all values to false)
PetscBTSet(bt,index) - sets a particular entry as true
PetscBTClear(bt,index) - sets a particular entry as false
PetscBTLookup(bt,index) - returns the value
PetscBTLookupSet(bt,index) - returns the value and then sets it true
PetscBTLength(m) - returns number of bytes in array with m bits
PetscBTView(m,bt,viewer) - prints all the entries in a bit array
<P>
The are all implemented as macros with the trivial data structure for efficiency.
<P>
These are not thread safe since they use a few global variables.
<P>
We do not currently check error flags on PetscBTSet(), PetscBTClear(), PetscBTLookup(),
PetcBTLookupSet(), PetscBTLength() cause error checking would cost hundreds more cycles then
the operation.
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../include/petscbt.h.html#PetscBT">include/petscbt.h</A>
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