[groff] 04/10: [troff]: Mark `H0`, `V0` objects as `const`.

[G. Branden Robinson]

gbranden pushed a commit to branch master
in repository groff.

commit 0b0d0bd0c5f6dae5b1b4325a5b5c5c4304200726
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
AuthorDate: Sun Sep 5 07:25:12 2021 +1000

    [troff]: Mark `H0`, `V0` objects as `const`.
    
    * src/roff/troff/hvunits.h:
    * src/roff/groff/number.cpp: Mark `H0`, `V0` objects as `const`.
---
 ChangeLog                 | 5 +++++
 src/roff/troff/hvunits.h  | 4 ++--
 src/roff/troff/number.cpp | 4 ++--
 3 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 025d6dd..4da047e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
 2021-09-05  G. Branden Robinson <g.branden.robinson@gmail.com>
 
+       * src/roff/troff/hvunits.h:
+       * src/roff/groff/number.cpp: Mark `H0`, `V0` objects as `const`.
+
+2021-09-05  G. Branden Robinson <g.branden.robinson@gmail.com>
+
        * src/roff/troff/env.cpp (do_underline_special): Refactor
        slightly.
          - Rename `underline_spaces` -> `do_underline_spaces`.
diff --git a/src/roff/troff/hvunits.h b/src/roff/troff/hvunits.h
index 4927f71..e47a0a0 100644
--- a/src/roff/troff/hvunits.h
+++ b/src/roff/troff/hvunits.h
@@ -44,7 +44,7 @@ public:
   friend inline int operator !=(const vunits&, const vunits&);
 };
 
-extern vunits V0;
+extern const vunits V0;
 
 
 class hunits {
@@ -73,7 +73,7 @@ public:
   friend inline int operator !=(const hunits&, const hunits&);
 };
 
-extern hunits H0;
+extern const hunits H0;
 
 extern int get_vunits(vunits *, unsigned char si);
 extern int get_hunits(hunits *, unsigned char si);
diff --git a/src/roff/troff/number.cpp b/src/roff/troff/number.cpp
index 825bc9a..b11c13c 100644
--- a/src/roff/troff/number.cpp
+++ b/src/roff/troff/number.cpp
@@ -26,8 +26,8 @@ along with this program.  If not, see 
<http://www.gnu.org/licenses/>. */
 #include "token.h"
 #include "div.h"
 
-vunits V0;
-hunits H0;
+const vunits V0; // zero in vertical units
+const hunits H0; // zero in horizontal units
 
 int hresolution = 1;
 int vresolution = 1;