Modifying emptyset.h and sexpr. Adding SetLanguage.

- Modifies expr/emptyset.h to use SetType only as an incomplete type within expr/emptyset.h. This breaks the include cycle between expr/emptyset.h, expr/expr.h and expr/type.h.
- Refactors SExpr to avoid a potentially infinite cycle. This is likely overkill, but it works.
- Moving Expr::setlanguage and related utilities out of the Expr class and into their own file. This allows files in util/ to know the output language set on an ostream.

1 files changed, 2 insertions, 1 deletions

diff --git a/examples/translator.cpp b/examples/translator.cpp
index 522d88573..7d5e912e7 100644
--- a/examples/translator.cpp
+++ b/examples/translator.cpp
@@ -24,6 +24,7 @@
 
 #include "expr/expr.h"
 #include "options/language.h"
+#include "options/set_language.h"
 #include "parser/parser.h"
 #include "parser/parser_builder.h"
 #include "smt/smt_engine.h"
@@ -97,7 +98,7 @@ static void readFile(const char* filename, InputLanguage fromLang, OutputLanguag
     toLang = toOutputLanguage(fromLang);
   }
 
-  *out << Expr::setlanguage(toLang);
+  *out << language::SetLanguage(toLang);
 
   Options opts;
   opts.set(options::inputLanguage, fromLang);