Faster bitwise operators

As in the C interface, alternative bitwise operators have been defined in order to more quickly operate on the mask at a point. In order to use these functions, the bitmasks corresponding to the type and states in question must first be obtained using the following functions:

$\parbox{\linewidth}{ \vspace{\baselineskip}\noindent\texttt{ SpaceM... ...item[\emph{type\_name}] A character string naming the type. \end{description}}}$

$\parbox{\linewidth}{ \vspace{\baselineskip}\noindent\texttt{ SpaceM... ...tem[\emph{type\_name}] A character string naming the state. \end{description}}}$

Once the bitmasks for the type and state have been obtained, the following macros can be used directly:

SpaceMask_SetStateBitsF90(mask, i, j, k, type_bits, state_bits)

This macro sets the value of the mask at the index $(i,j,k)$ to the given state. It doesn't have a return value, and can be used directly inline (without a Fortran `call').

SpaceMask_CheckStateBitsF90(mask, i, j, k, type_bits, state_bits)

A value of `.true.' is returned if the given state has been set, or `.false.' otherwise. The macro can be used directly in Fortran boolean expressions, as in the examples in Appendix D19.6.2.