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+.TH LIBJ2_CO_J2U 3 LIBJ2
+.SH NAME
+libj2_co_j2u \- Count ones
+
+.SH SYNOPSIS
+.nf
+#include <libj2.h>
+
+unsigned \fBlibj2_co_j2u\fP(const struct libj2_j2u *\fIa\fP);
+.fi
+.PP
+Link with
+.IR -lj2 .
+
+.SH DESCRIPTION
+The
+.BR libj2_co_j2u ()
+function returns the number of set bits in
+.IR a .
+.PP
+.I a
+is assumed to be
+.RI non- NULL .
+
+.SH RETURN VALUE
+The
+.BR libj2_co_j2u ()
+function returns the number of set bits in
+.IR a .
+
+.SH ERRORS
+The
+.BR libj2_co_j2u ()
+function cannot fail.
+
+.SH SEE ALSO
+.BR libj2 (7),
+.BR libj2_cz_j2u (3),
+.BR libj2_parity_j2u (3),
+.BR libj2_clo_j2u (3),
+.BR libj2_cto_j2u (3)