/** @file constant.cpp
*
- * Implementation of GiNaC's constant types and some special constants.
- *
- * GiNaC Copyright (C) 1999 Johannes Gutenberg University Mainz, Germany
+ * Implementation of GiNaC's constant types and some special constants. */
+
+/*
+ * GiNaC Copyright (C) 1999-2001 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
#include <string>
#include <stdexcept>
+#include <iostream>
#include "constant.h"
#include "numeric.h"
#include "ex.h"
+#include "print.h"
+#include "archive.h"
+#include "utils.h"
+
+namespace GiNaC {
+
+GINAC_IMPLEMENT_REGISTERED_CLASS(constant, basic)
//////////
-// default constructor, destructor, copy constructor assignment operator and helpers
+// default ctor, dtor, copy ctor, assignment operator and helpers
//////////
// public
-constant::~constant()
+constant::constant() : basic(TINFO_constant), ef(0), number(0), serial(next_serial++) {}
+
+// protected
+
+/** For use by copy ctor and assignment operator. */
+void constant::copy(const constant & other)
{
- debugmsg("constant destructor",LOGLEVEL_DESTRUCT);
- destroy(0);
+ inherited::copy(other);
+ name = other.name;
+ TeX_name = other.TeX_name;
+ serial = other.serial;
+ ef = other.ef;
+ if (other.number != 0)
+ number = new numeric(*other.number);
+ else
+ number = 0;
}
-constant::constant(constant const & other)
+void constant::destroy(bool call_parent)
{
- debugmsg("constant copy constructor",LOGLEVEL_CONSTRUCT);
- copy(other);
+ delete number;
+ if (call_parent)
+ inherited::destroy(call_parent);
}
-// protected
+//////////
+// other ctors
+//////////
+
+// public
-void constant::copy(constant const & other)
+constant::constant(const std::string & initname, evalffunctype efun, const std::string & texname)
+ : basic(TINFO_constant), name(initname), ef(efun), number(0), serial(next_serial++)
{
- basic::copy(other);
- name=other.name;
- serial=other.serial;
- ef=other.ef;
- if (other.number != 0) {
- number = new numeric(*other.number);
- } else {
- number = 0;
- }
- fct_assigned=other.fct_assigned;
+ if (texname.empty())
+ TeX_name = "\\mbox{" + name + "}";
+ else
+ TeX_name = texname;
+ setflag(status_flags::evaluated | status_flags::expanded);
}
-void constant::destroy(bool call_parent)
+constant::constant(const std::string & initname, const numeric & initnumber, const std::string & texname)
+ : basic(TINFO_constant), name(initname), ef(0), number(new numeric(initnumber)), serial(next_serial++)
{
- delete number;
- if (call_parent)
- basic::destroy(call_parent);
+ if (texname.empty())
+ TeX_name = "\\mbox{" + name + "}";
+ else
+ TeX_name = texname;
+ setflag(status_flags::evaluated | status_flags::expanded);
}
//////////
-// other constructors
+// archiving
//////////
-// public
+constant::constant(const archive_node &n, const lst &sym_lst) : inherited(n, sym_lst) {}
-constant::constant(string const & initname, ex (*efun)()) :
- basic(TINFO_constant), name(initname), ef(efun),
- number(0), fct_assigned(true), serial(next_serial++)
+ex constant::unarchive(const archive_node &n, const lst &sym_lst)
{
- debugmsg("constant constructor from string, function",LOGLEVEL_CONSTRUCT);
+ // Find constant by name (!! this is bad: 'twould be better if there
+ // was a list of all global constants that we could search)
+ std::string s;
+ if (n.find_string("name", s)) {
+ if (s == Pi.name)
+ return Pi;
+ else if (s == Catalan.name)
+ return Catalan;
+ else if (s == Euler.name)
+ return Euler;
+ else
+ throw (std::runtime_error("unknown constant '" + s + "' in archive"));
+ } else
+ throw (std::runtime_error("unnamed constant in archive"));
}
-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++)
+void constant::archive(archive_node &n) const
{
- debugmsg("constant constructor from string, numeric",LOGLEVEL_CONSTRUCT);
+ inherited::archive(n);
+ n.add_string("name", name);
}
//////////
-// functions overriding virtual functions from bases classes
+// functions overriding virtual functions from base classes
//////////
// public
-basic * constant::duplicate() const
+void constant::print(const print_context & c, unsigned level) const
{
- debugmsg("constant duplicate",LOGLEVEL_DUPLICATE);
- return new constant(*this);
+ if (is_a<print_tree>(c)) {
+ c.s << std::string(level, ' ') << name << " (" << class_name() << ")"
+ << std::hex << ", hash=0x" << hashvalue << ", flags=0x" << flags << std::dec
+ << std::endl;
+ } else if (is_a<print_latex>(c)) {
+ c.s << TeX_name;
+ } else if (is_a<print_python_repr>(c)) {
+ c.s << class_name() << "('" << name << "'";
+ if (TeX_name != "\\mbox{" + name + "}")
+ c.s << ",TeX_name='" << TeX_name << "'";
+ c.s << ')';
+ } else
+ c.s << name;
+}
+
+int constant::degree(const ex & s) const
+{
+ return is_equal(ex_to<basic>(s)) ? 1 : 0;
+}
+
+int constant::ldegree(const ex & s) const
+{
+ return is_equal(ex_to<basic>(s)) ? 1 : 0;
+}
+
+ex constant::coeff(const ex & s, int n) const
+{
+ if (is_equal(ex_to<basic>(s)))
+ return n==1 ? _ex1 : _ex0;
+ else
+ return n==0 ? *this : _ex0;
}
ex constant::evalf(int level) const
{
- if (fct_assigned) {
- return ef();
- } else if (number != 0) {
- return *number;
- }
- return *this;
+ if (ef!=0) {
+ return ef();
+ } else if (number != 0) {
+ return number->evalf();
+ }
+ return *this;
}
// protected
-int constant::compare_same_type(basic const & other) const
+/** Implementation of ex::diff() for a constant always returns 0.
+ *
+ * @see ex::diff */
+ex constant::derivative(const symbol & s) const
+{
+ return _ex0;
+}
+
+int constant::compare_same_type(const basic & other) const
{
- ASSERT(is_exactly_of_type(other, constant));
- // constant const & o=static_cast<constant &>(const_cast<basic &>(other));
- // return name.compare(o.name);
- const constant *o = static_cast<const constant *>(&other);
- if (serial==o->serial) return 0;
- return serial < o->serial ? -1 : 1;
+ GINAC_ASSERT(is_exactly_a<constant>(other));
+ const constant &o = static_cast<const constant &>(other);
+
+ if (serial == o.serial)
+ return 0;
+ else
+ return serial < o.serial ? -1 : 1;
}
-bool constant::is_equal_same_type(basic const & other) const
+bool constant::is_equal_same_type(const basic & other) const
{
- ASSERT(is_exactly_of_type(other, constant));
- const constant *o = static_cast<const constant *>(&other);
- return serial==o->serial;
+ GINAC_ASSERT(is_exactly_a<constant>(other));
+ const constant &o = static_cast<const constant &>(other);
+
+ return serial == o.serial;
+}
+
+unsigned constant::calchash(void) const
+{
+ hashvalue = golden_ratio_hash(tinfo() ^ serial);
+ // mask out numeric hashes:
+ hashvalue &= 0x7FFFFFFFU;
+
+ setflag(status_flags::hash_calculated);
+
+ return hashvalue;
}
//////////
// static member variables
//////////
-unsigned constant::next_serial=0;
+unsigned constant::next_serial = 0;
//////////
// global constants
//////////
-const constant some_constant("",0);
-type_info const & typeid_constant=typeid(some_constant);
-
/** Pi. (3.14159...) Diverts straight into CLN for evalf(). */
-const constant Pi("Pi", PiEvalf);
-/** Catalan's constant. (0.91597...) Diverts straight into CLN for evalf(). */
-const constant EulerGamma("EulerGamma", EulerGammaEvalf);
+const constant Pi("Pi", PiEvalf, "\\pi");
+
/** Euler's constant. (0.57721...) Sometimes called Euler-Mascheroni constant.
* Diverts straight into CLN for evalf(). */
-const constant Catalan("Catalan", CatalanEvalf);
+const constant Euler("Euler", EulerEvalf, "\\gamma_E");
+
+/** Catalan's constant. (0.91597...) Diverts straight into CLN for evalf(). */
+const constant Catalan("Catalan", CatalanEvalf, "G");
+
+} // namespace GiNaC
git://www.ginac.de / ginac.git / blobdiff