Delete functions instead of using CVC4_UNDEFINED (#1794)

C++11 supports explicitly deleting functions that should not be used
(explictly or implictly), e.g. copy or assignment constructors. We were
previously using the CVC4_UNDEFINED macro that used a compiler-specific
attribute. The C++11 feature should be more portable.

1 files changed, 3 insertions, 3 deletions

diff --git a/src/theory/theory.h b/src/theory/theory.h
index 2c3c727cb..5d176a36b 100644
--- a/src/theory/theory.h
+++ b/src/theory/theory.h
@@ -83,9 +83,9 @@ private:
   friend class ::CVC4::TheoryEngine;
 
   // Disallow default construction, copy, assignment.
-  Theory() CVC4_UNDEFINED;
-  Theory(const Theory&) CVC4_UNDEFINED;
-  Theory& operator=(const Theory&) CVC4_UNDEFINED;
+  Theory() = delete;
+  Theory(const Theory&) = delete;
+  Theory& operator=(const Theory&) = delete;
 
   /** An integer identifying the type of the theory. */
   TheoryId d_id;