- implemented global class registry (for class basic and derived classes)

[ginac.git] / ginac / constant.cpp

diff --git a/ginac/constant.cpp b/ginac/constant.cpp
index 12e9dde44f6d734bfda71c56b453c9b0cdc674b3..1e9a4c15a4b9a10f904aa0a4c2a4c53ad60e67b5 100644 (file)
--- a/ginac/constant.cpp
+++ b/ginac/constant.cpp
@@ -3,7 +3,7 @@
  *  Implementation of GiNaC's constant types and some special constants. */
 
 /*
- *  GiNaC Copyright (C) 1999 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2000 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
@@ -26,18 +26,28 @@
 #include "constant.h"
 #include "numeric.h"
 #include "ex.h"
+#include "archive.h"
 #include "debugmsg.h"
 
 #ifndef NO_GINAC_NAMESPACE
 namespace GiNaC {
 #endif // ndef NO_GINAC_NAMESPACE
 
+GINAC_IMPLEMENT_REGISTERED_CLASS(constant, basic)
+
 //////////
 // default constructor, destructor, copy constructor assignment operator and helpers
 //////////
 
 // public
 
+constant::constant() :
+    basic(TINFO_constant), name(""), ef(0),
+    number(0), serial(next_serial++)
+{
+    debugmsg("constant default constructor",LOGLEVEL_CONSTRUCT);
+}
+
 constant::~constant()
 {
     debugmsg("constant destructor",LOGLEVEL_DESTRUCT);
@@ -63,7 +73,7 @@ void constant::copy(constant const & other)
     } else {
         number = 0;
     }
-    fct_assigned=other.fct_assigned;
+    // fct_assigned=other.fct_assigned;
 }
 
 void constant::destroy(bool call_parent)
@@ -79,20 +89,57 @@ void constant::destroy(bool call_parent)
 
 // public
 
-constant::constant(string const & initname, ex (*efun)()) :
+constant::constant(string const & initname, evalffunctype efun) :
     basic(TINFO_constant), name(initname), ef(efun),
-    number(0), fct_assigned(true), serial(next_serial++)
+    // number(0), fct_assigned(true), serial(next_serial++)
+    number(0), serial(next_serial++)
 {
     debugmsg("constant constructor from string, function",LOGLEVEL_CONSTRUCT);
 }
 
 constant::constant(string const & initname, numeric const & initnumber) :
     basic(TINFO_constant), name(initname), ef(0),
-    number(new numeric(initnumber)), fct_assigned(false), serial(next_serial++)
+    number(new numeric(initnumber)), /* fct_assigned(false),*/ serial(next_serial++)
 {
     debugmsg("constant constructor from string, numeric",LOGLEVEL_CONSTRUCT);
 }
 
+//////////
+// archiving
+//////////
+
+/** Construct object from archive_node. */
+constant::constant(const archive_node &n, const lst &sym_lst) : inherited(n, sym_lst)
+{
+    debugmsg("constant constructor from archive_node", LOGLEVEL_CONSTRUCT);
+}
+
+/** Unarchive the object. */
+ex constant::unarchive(const archive_node &n, const lst &sym_lst)
+{
+    // Find constant by name (!! this is bad: 'twould be better if there
+    // was a list of all global constants that we could search)
+    string s;
+    if (n.find_string("name", s)) {
+        if (s == Pi.name)
+            return Pi;
+        else if (s == Catalan.name)
+            return Catalan;
+        else if (s == EulerGamma.name)
+            return EulerGamma;
+        else
+            throw (std::runtime_error("unknown constant '" + s + "' in archive"));
+    } else
+        throw (std::runtime_error("unnamed constant in archive"));
+}
+
+/** Archive the object. */
+void constant::archive(archive_node &n) const
+{
+    inherited::archive(n);
+    n.add_string("name", name);
+}
+
 //////////
 // functions overriding virtual functions from bases classes
 //////////
@@ -105,9 +152,36 @@ basic * constant::duplicate() const
     return new constant(*this);
 }
 
+void constant::print(ostream & os, unsigned upper_precedence) const
+{
+    debugmsg("constant print",LOGLEVEL_PRINT);
+    os << name;
+}
+
+void constant::printraw(ostream & os) const
+{
+    debugmsg("constant printraw",LOGLEVEL_PRINT);
+    os << "constant(" << name << ")";
+}
+
+void constant::printtree(ostream & os, unsigned indent) const
+{
+    debugmsg("constant printtree",LOGLEVEL_PRINT);
+    os << string(indent,' ') << name
+       << ", type=" << typeid(*this).name()
+       << ", hash=" << hashvalue << " (0x" << hex << hashvalue << dec << ")"
+       << ", flags=" << flags << endl;
+}
+
+void constant::printcsrc(ostream & os, unsigned type, unsigned upper_precedence) const
+{
+    debugmsg("constant print csrc",LOGLEVEL_PRINT);
+    os << name;
+}
+
 ex constant::evalf(int level) const
 {
-    if (fct_assigned) {
+    if (ef!=0) {
         return ef();
     } else if (number != 0) {
         return *number;
@@ -156,7 +230,7 @@ unsigned constant::next_serial=0;
 // global constants
 //////////
 
-const constant some_constant("",0);
+const constant some_constant;
 type_info const & typeid_constant=typeid(some_constant);
 
 /**  Pi. (3.14159...)  Diverts straight into CLN for evalf(). */