call.c (standard_conversion): Return NULL instead of 0.

	* call.c (standard_conversion): Return NULL instead of 0.
	(build_user_type_conversion_1): Likewise.
	(tourney): Likewise.
	* decl.c (redeclaration_error_message): Likewise.
	* error.c (language_to_string): Likewise.

From-SVN: r110976

gcc/cp/ChangeLog

+2006-02-14  Volker Reichelt  <reichelt@igpm.rwth-aachen.de>
+
+	* call.c (standard_conversion): Return NULL instead of 0.
+	(build_user_type_conversion_1): Likewise.
+	(tourney): Likewise.
+	* decl.c (redeclaration_error_message): Likewise.
+	* error.c (language_to_string): Likewise.
+
 2006-02-13  Volker Reichelt  <reichelt@igpm.rwth-aachen.de>
 
 	* cp-tree.h (warn_hidden): Remove prototype.

gcc/cp/call.c

@@ -768,7 +768,7 @@ standard_conversion (tree to, tree from, tree expr, bool c_cast_p,
 	  || !compparms (TREE_CHAIN (TYPE_ARG_TYPES (fromfn)),
 			 TREE_CHAIN (TYPE_ARG_TYPES (tofn)))
 	  || cp_type_quals (fbase) != cp_type_quals (tbase))
-	return 0;
+	return NULL;
 
       from = cp_build_qualified_type (tbase, cp_type_quals (fbase));
       from = build_method_type_directly (from,
@@ -806,7 +806,7 @@ standard_conversion (tree to, tree from, tree expr, bool c_cast_p,
 	   || tcode == REAL_TYPE)
     {
       if (! (INTEGRAL_CODE_P (fcode) || fcode == REAL_TYPE))
-	return 0;
+	return NULL;
       conv = build_conv (ck_std, to, conv);
 
       /* Give this a better rank if it's a promotion.  */
@@ -2615,7 +2615,7 @@ build_user_type_conversion_1 (tree totype, tree expr, int flags)
 
   candidates = splice_viable (candidates, pedantic, &any_viable_p);
   if (!any_viable_p)
-    return 0;
+    return NULL;
 
   cand = tourney (candidates);
   if (cand == 0)
@@ -6247,7 +6247,7 @@ tourney (struct z_candidate *candidates)
 	    {
 	      champ = challenger->next;
 	      if (champ == 0)
-		return 0;
+		return NULL;
 	      champ_compared_to_predecessor = 0;
 	    }
 	  else
@@ -6270,7 +6270,7 @@ tourney (struct z_candidate *candidates)
     {
       fate = joust (champ, challenger, 0);
       if (fate != 1)
-	return 0;
+	return NULL;
     }
 
   return champ;

gcc/cp/decl.c

@@ -1976,7 +1976,7 @@ redeclaration_error_message (tree newdecl, tree olddecl)
 	 constructs like "typedef struct foo { ... } foo"
 	 would look like an erroneous redeclaration.  */
       if (same_type_p (TREE_TYPE (newdecl), TREE_TYPE (olddecl)))
-	return 0;
+	return NULL;
       else
 	return "redefinition of %q#D";
     }
@@ -1987,7 +1987,7 @@ redeclaration_error_message (tree newdecl, tree olddecl)
 	 abort()).  Don't complain about redefinition in this case.  */
       if (DECL_LANG_SPECIFIC (olddecl) && DECL_PURE_VIRTUAL_P (olddecl)
 	  && DECL_INITIAL (olddecl) == NULL_TREE)
-	return 0;
+	return NULL;
 
       /* If both functions come from different namespaces, this is not
 	 a redeclaration - this is a conflict with a used function.  */
@@ -2008,7 +2008,7 @@ redeclaration_error_message (tree newdecl, tree olddecl)
 	  else
 	    return "redefinition of %q#D";
 	}
-      return 0;
+      return NULL;
     }
   else if (TREE_CODE (newdecl) == TEMPLATE_DECL)
     {
@@ -2055,7 +2055,7 @@ redeclaration_error_message (tree newdecl, tree olddecl)
       /* Objects declared at top level:  */
       /* If at least one is a reference, it's ok.  */
       if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
-	return 0;
+	return NULL;
       /* Reject two definitions.  */
       return "redefinition of %q#D";
     }
@@ -2066,7 +2066,7 @@ redeclaration_error_message (tree newdecl, tree olddecl)
 	 together with an external reference.  */
       if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
 	return "redeclaration of %q#D";
-      return 0;
+      return NULL;
     }
 }
 

gcc/cp/error.c

@@ -2055,7 +2055,7 @@ language_to_string (enum languages c)
     default:
       gcc_unreachable ();
     }
-  return 0;
+  return NULL;
 }
 
 /* Return the proper printed version of a parameter to a C++ function.  */