old_params ==> front_end_params. Isolated abstract solver interface

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>

src/solver/check_sat_result.cpp

@@ -0,0 +1,54 @@
+/*++
+Copyright (c) 2012 Microsoft Corporation
+
+Module Name:
+
+    check_sat_result.cpp
+
+Abstract:
+    Abstract interface for storing the result produced by 
+    a check_sat like command
+
+Author:
+
+    Leonardo (leonardo) 2012-11-01
+
+Notes:
+
+--*/
+#include"check_sat_result.h"
+
+simple_check_sat_result::simple_check_sat_result(ast_manager & m):
+    m_core(m),
+    m_proof(m) {
+    }
+
+simple_check_sat_result::~simple_check_sat_result() {
+}
+
+void simple_check_sat_result::collect_statistics(statistics & st) const { 
+    st.copy(m_stats); 
+}
+
+void simple_check_sat_result::get_unsat_core(ptr_vector<expr> & r) { 
+    if (m_status == l_false) 
+        r.append(m_core.size(), m_core.c_ptr()); 
+}
+ 
+void simple_check_sat_result::get_model(model_ref & m) { 
+    if (m_status != l_false) 
+        m = m_model; 
+    else 
+        m = 0; 
+}
+
+proof * simple_check_sat_result::get_proof() { 
+    return m_status == l_false ? m_proof.get() : 0; 
+}
+
+std::string simple_check_sat_result::reason_unknown() const { 
+    return m_unknown; 
+}
+
+void simple_check_sat_result::get_labels(svector<symbol> & r) {
+}