Implement basic integer variable detection

This adds initial support for detecting integer variables in formulas.
The scope is somewhat limited in that variables matching predicate
parameters with known integer type aren’t propagated to be integer as
well yet. Also, the use of constants and functions prevents variables
from being detected as integer, because they have to be assumed to be
externally defined in such a way that they evaluate to general values
and not necessarily integers.

include/anthem/IntegerVariableDetection.h

@@ -0,0 +1,22 @@
+#ifndef __ANTHEM__INTEGER_VARIABLE_DETECTION_H
+#define __ANTHEM__INTEGER_VARIABLE_DETECTION_H
+
+#include <anthem/AST.h>
+#include <anthem/Context.h>
+
+namespace anthem
+{
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+//
+// IntegerVariableDetection
+//
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+void detectIntegerVariables(std::vector<ast::Formula> &completedFormulas);
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+}
+
+#endif