buffer: require a move constructor to avoid copies

remove unneded copy constructors from several classes

src/math/grobner/pdd_solver.h

@@ -25,6 +25,7 @@
 #include "util/rlimit.h"
 #include "util/statistics.h"
 #include "math/dd/dd_pdd.h"
+#include <cstring>
 
 namespace dd {
 

src/math/hilbert/hilbert_basis.h

@@ -25,14 +25,14 @@ Revision History:
 
 --*/
 
-#ifndef HILBERT_BASIS_H_
-#define HILBERT_BASIS_H_
+#pragma once
 
 #include "util/rational.h"
 #include "util/lbool.h"
 #include "util/statistics.h"
 #include "util/checked_int64.h"
 #include "util/rlimit.h"
+#include <cstring>
 
 typedef vector<rational> rational_vector;
 
@@ -198,6 +198,3 @@ public:
     void reset_statistics();     
 
 };
-
-
-#endif 

src/math/lp/lp_settings.h

@@ -24,6 +24,7 @@ Revision History:
 #include <algorithm>
 #include <limits>
 #include <iomanip>
+#include <cstring>
 #include "math/lp/lp_utils.h"
 #include "util/stopwatch.h"
 #include "math/lp/lp_types.h"

src/math/simplex/sparse_matrix.h

@@ -16,11 +16,11 @@ Notes:
 
 --*/
 
-#ifndef SPARSE_MATRIX_H_
-#define SPARSE_MATRIX_H_
+#pragma once
 
 #include "util/mpq_inf.h"
 #include "util/statistics.h"
+#include <cstring>
 
 namespace simplex {
 
@@ -271,6 +271,3 @@ namespace simplex {
     };
 
 };
-
-
-#endif

src/math/subpaving/subpaving_types.h

@@ -16,8 +16,7 @@ Author:
 Revision History:
 
 --*/
-#ifndef SUBPAVING_TYPES_H_
-#define SUBPAVING_TYPES_H_
+#pragma once
 
 namespace subpaving {
 
@@ -34,7 +33,6 @@ class power : public std::pair<var, unsigned> {
 public:
     power():std::pair<var, unsigned>() {}
     power(var v, unsigned d):std::pair<var, unsigned>(v, d) {}
-    power(power const & p):std::pair<var, unsigned>(p) {}
     var x() const { return first; }
     var get_var() const { return first; }
     unsigned degree() const { return second; }
@@ -47,6 +45,4 @@ struct display_var_proc {
     virtual void operator()(std::ostream & out, var x) const { out << "x" << x; }
 };
 
-};
-
-#endif
+}