[bugfix] Always #include <lst.h> before using lst. Fixes build error on MinGW.

[ginac.git] / ginac / ex.h

diff --git a/ginac/ex.h b/ginac/ex.h
index 4a603ce03778d441a9bfb1209cfdb0b3995bce2a..f5008a0f6edd2d2121d61f6efd0f12d4570bfaa4 100644 (file)
--- a/ginac/ex.h
+++ b/ginac/ex.h
@@ -3,7 +3,7 @@
  *  Interface to GiNaC's light-weight expression handles. */
 
 /*
- *  GiNaC Copyright (C) 1999-2008 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2011 Johannes Gutenberg University Mainz, Germany
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -20,19 +20,23 @@
  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
-#ifndef __GINAC_EX_H__
-#define __GINAC_EX_H__
+#ifndef GINAC_EX_H
+#define GINAC_EX_H
 
+#include "basic.h"
+#include "ptr.h"
+
+#include <functional>
 #include <iosfwd>
 #include <iterator>
-#include <functional>
 #include <stack>
 
-#include "basic.h"
-#include "ptr.h"
-
 namespace GiNaC {
-
+#ifdef _MSC_VER
+  // MSVC produces a different symbol for _ex0 when it is declared inside   
+  // ex::is_zero() than when it is declared at top level as follows
+  extern const ex _ex0;
+#endif
 
 /** Helper class to initialize the library.  There must be one static object
  *  of this class in every object file that makes use of our flyweights in
@@ -43,6 +47,7 @@ namespace GiNaC {
  *
  *  @see utils.cpp */
 class library_init {
+       static void init_unarchivers();
 public:
        library_init();
        ~library_init();
@@ -204,7 +209,12 @@ public:
        // comparison
        int compare(const ex & other) const;
        bool is_equal(const ex & other) const;
-       bool is_zero() const { extern const ex _ex0; return is_equal(_ex0); }
+       bool is_zero() const { 
+#ifndef _MSC_VER
+         extern const ex _ex0;
+#endif
+         return is_equal(_ex0); 
+       }
        bool is_zero_matrix() const;
        
        // symmetry
@@ -217,7 +227,7 @@ public:
 
        // noncommutativity
        unsigned return_type() const { return bp->return_type(); }
-       tinfo_t return_type_tinfo() const { return bp->return_type_tinfo(); }
+       return_type_t return_type_tinfo() const { return bp->return_type_tinfo(); }
 
        unsigned gethash() const { return bp->gethash(); }
 
@@ -975,4 +985,4 @@ inline void iter_swap(list<GiNaC::ex>::iterator i1, list<GiNaC::ex>::iterator i2
 
 } // namespace std
 
-#endif // ndef __GINAC_EX_H__
+#endif // ndef GINAC_EX_H