* iface/gspn/gspn.cc, src/ltlvisit/basicreduce.cc,

src/ltlvisit/destroy.cc, src/ltlvisit/dotty.cc,
src/ltlvisit/dump.cc, src/ltlvisit/length.cc,
src/ltlvisit/nenoform.cc, src/ltlvisit/reduce.cc,
src/ltlvisit/syntimpl.cc, src/ltlvisit/tostring.cc,
src/tgba/formula2bdd.cc, src/tgba/tgbabddconcreteproduct.cc,
src/tgba/tgbatba.cc, src/tgbaalgos/dotty.cc,
src/tgbaalgos/dupexp.cc, src/tgbaalgos/lbtt.cc,
src/tgbaalgos/ltl2tgba_lacim.cc, src/tgbaalgos/neverclaim.cc,
src/tgbaalgos/save.cc, src/tgbaalgos/stats.cc,
src/tgbaalgos/gtec/nsheap.cc, src/tgbaalgos/gtec/nsheap.hh:
Declare private classes and helper function in anonymous namespaces.
* HACKING, src/sanity/style.test: Document and check this.
Also check for trailing { after namespace or class.
* src/ltlast/predecl.hh, src/ltlast/visitor.hh,
src/tgba/tgbareduc.hh: Fix trailing {.

src/sanity/style.test

@@ -72,6 +72,12 @@ for dir in "${INCDIR-..}" "${INCDIR-..}"/../iface; do
     grep '[	 ]switch (.*).*{' $tmp &&
       diag 'Opening { should be on its own line.'
 
+    grep 'namespace .*{' $tmp &&
+      diag 'Opening { should be on its own line.'
+
+    grep 'class .*{' $tmp &&
+      diag 'Opening { should be on its own line.'
+
     grep '( ' $tmp &&
       diag 'No space after opening (.'
 
@@ -137,6 +143,15 @@ for dir in "${INCDIR-..}" "${INCDIR-..}"/../iface; do
             diag 'Avoid <iostream> in headers, better use <iosfwd>.'
         fi
         ;;
+      *.cc)
+        if grep 'namespace$' $tmp >/dev/null; then
+	  :
+	else
+	  # We only check classes, but the rule should apply to functions too
+	  grep '^[	 ]*class[	 ]' $tmp &&
+	    diag 'Private definitions must be in anonymous namespace.'
+	fi
+	;;
     esac