[troff]: Trivially refactor ("constant_int_reg").

Rename class `constant_int_reg` to `readonly_register`.  Say "readonly"
instead of "const" to try to avoid confusion with C++ constness.  Drop
"int" because integer-valued registers are the norm, not the exception.

* src/roff/troff/column.cpp (init_column_requests):
* src/roff/troff/div.cpp (init_div_requests):
* src/roff/troff/input.cpp (top level, init_input_requests):
* src/roff/troff/node.cpp (init_node_requests):
* src/roff/troff/reg.h: Do it.

5 files changed, 16 insertions, 16 deletions

diff --git a/src/roff/troff/column.cpp b/src/roff/troff/column.cpp
index 43ae9aa38..55563ba46 100644
--- a/src/roff/troff/column.cpp
+++ b/src/roff/troff/column.cpp
@@ -725,7 +725,7 @@ void init_column_requests()
   register_dictionary.define(".colx", new column_extra_space_reg);
   register_dictionary.define(".cola", new column_active_reg);
   register_dictionary.define(".nvj",
-			       new constant_int_reg(&no_vjustify_mode));
+			       new readonly_register(&no_vjustify_mode));
 }
 
 #endif /* COLUMN */
diff --git a/src/roff/troff/div.cpp b/src/roff/troff/div.cpp
index f9dd8b350..48565262e 100644
--- a/src/roff/troff/div.cpp
+++ b/src/roff/troff/div.cpp
@@ -1181,7 +1181,7 @@ void init_div_requests()
   init_request("vpt", vertical_position_traps);
   init_request("wh", when_request);
   register_dictionary.define(".a",
-		       new constant_int_reg(&last_post_line_extra_space));
+		       new readonly_register(&last_post_line_extra_space));
   register_dictionary.define(".d", new vertical_position_reg);
   register_dictionary.define(".h", new high_water_mark_reg);
   register_dictionary.define(".ne",
@@ -1195,7 +1195,7 @@ void init_div_requests()
   register_dictionary.define(".trunc",
 			       new constant_vunits_reg(&truncated_space));
   register_dictionary.define(".vpt",
-		       new constant_int_reg(&vertical_position_traps_flag));
+		       new readonly_register(&vertical_position_traps_flag));
   register_dictionary.define(".z", new diversion_name_reg);
   register_dictionary.define("dl", new variable_reg(&dl_reg_contents));
   register_dictionary.define("dn", new variable_reg(&dn_reg_contents));
diff --git a/src/roff/troff/input.cpp b/src/roff/troff/input.cpp
index 5356f1092..cd786087b 100644
--- a/src/roff/troff/input.cpp
+++ b/src/roff/troff/input.cpp
@@ -7559,11 +7559,11 @@ const char *readonly_text_register::get_string()
   return s;
 }
 
-constant_int_reg::constant_int_reg(int *q) : p(q)
+readonly_register::readonly_register(int *q) : p(q)
 {
 }
 
-const char *constant_int_reg::get_string()
+const char *readonly_register::get_string()
 {
   return i_to_a(*p);
 }
@@ -8460,18 +8460,18 @@ void init_input_requests()
   init_request("writem", write_macro_request);
   register_dictionary.define(".$", new nargs_reg);
   register_dictionary.define(".br", new break_flag_reg);
-  register_dictionary.define(".C", new constant_int_reg(&compatible_flag));
-  register_dictionary.define(".cp", new constant_int_reg(&do_old_compatible_flag));
+  register_dictionary.define(".C", new readonly_register(&compatible_flag));
+  register_dictionary.define(".cp", new readonly_register(&do_old_compatible_flag));
   register_dictionary.define(".O", new variable_reg(&begin_level));
   register_dictionary.define(".c", new lineno_reg);
-  register_dictionary.define(".color", new constant_int_reg(&color_flag));
+  register_dictionary.define(".color", new readonly_register(&color_flag));
   register_dictionary.define(".F", new filename_reg);
   register_dictionary.define(".g", new readonly_text_register("1"));
-  register_dictionary.define(".H", new constant_int_reg(&hresolution));
+  register_dictionary.define(".H", new readonly_register(&hresolution));
   register_dictionary.define(".R", new readonly_text_register("10000"));
-  register_dictionary.define(".U", new constant_int_reg(&unsafe_flag));
-  register_dictionary.define(".V", new constant_int_reg(&vresolution));
-  register_dictionary.define(".warn", new constant_int_reg(&warning_mask));
+  register_dictionary.define(".U", new readonly_register(&unsafe_flag));
+  register_dictionary.define(".V", new readonly_register(&vresolution));
+  register_dictionary.define(".warn", new readonly_register(&warning_mask));
   extern const char *major_version;
   register_dictionary.define(".x", new readonly_text_register(major_version));
   extern const char *revision;
diff --git a/src/roff/troff/node.cpp b/src/roff/troff/node.cpp
index 3d105f0ee..d17198db8 100644
--- a/src/roff/troff/node.cpp
+++ b/src/roff/troff/node.cpp
@@ -6642,9 +6642,9 @@ void init_node_requests()
   init_request("uf", underline_font);
   register_dictionary.define(".fp", new next_available_font_position_reg);
   register_dictionary.define(".kern",
-			       new constant_int_reg(&global_kern_mode));
+			       new readonly_register(&global_kern_mode));
   register_dictionary.define(".lg",
-			       new constant_int_reg(&global_ligature_mode));
+			       new readonly_register(&global_ligature_mode));
   register_dictionary.define(".P", new printing_reg);
   soft_hyphen_char = get_charinfo(HYPHEN_SYMBOL);
 }
diff --git a/src/roff/troff/reg.h b/src/roff/troff/reg.h
index 8378649f1..132bcf1f7 100644
--- a/src/roff/troff/reg.h
+++ b/src/roff/troff/reg.h
@@ -30,10 +30,10 @@ public:
   virtual void set_value(units);
 };
 
-class constant_int_reg : public reg {
+class readonly_register : public reg {
   int *p;
 public:
-  constant_int_reg(int *);
+  readonly_register(int *);
   const char *get_string();
 };