* Definition of helper classes for expression output. */
/*
- * GiNaC Copyright (C) 1999-2003 Johannes Gutenberg University Mainz, Germany
+ * GiNaC Copyright (C) 1999-2008 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
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef __GINAC_PRINT_H__
#include <iosfwd>
#include <string>
+#include <memory>
#include "class_info.h"
public: \
typedef supername inherited; \
friend class function_options; \
-private: \
- static GiNaC::print_context_class_info reg_info; \
+ friend class registered_class_options; \
public: \
- virtual const GiNaC::print_context_class_info &get_class_info() const { return reg_info; } \
- virtual const char *class_name() const { return reg_info.options.get_name(); } \
+ static const GiNaC::print_context_class_info &get_class_info_static(); \
+ virtual const GiNaC::print_context_class_info &get_class_info() const { return classname::get_class_info_static(); } \
+ virtual const char *class_name() const { return classname::get_class_info_static().options.get_name(); } \
\
classname(); \
- classname * duplicate() const { return new classname(*this); } \
+ virtual classname * duplicate() const { return new classname(*this); } \
private:
/** Macro for inclusion in the implementation of each print_context class. */
#define GINAC_IMPLEMENT_PRINT_CONTEXT(classname, supername) \
- GiNaC::print_context_class_info classname::reg_info = GiNaC::print_context_class_info(print_context_options(#classname, #supername, next_print_context_id++));
+const GiNaC::print_context_class_info &classname::get_class_info_static() \
+{ \
+ static GiNaC::print_context_class_info reg_info = GiNaC::print_context_class_info(GiNaC::print_context_options(#classname, #supername, GiNaC::next_print_context_id++)); \
+ return reg_info; \
+}
+
extern unsigned next_print_context_id;
inline bool is_a(const print_context & obj)
{ return dynamic_cast<const T *>(&obj) != 0; }
+
+class basic;
+
+/** Base class for print_functor handlers */
+class print_functor_impl {
+public:
+ virtual ~print_functor_impl() {}
+ virtual print_functor_impl *duplicate() const = 0;
+ virtual void operator()(const basic & obj, const print_context & c, unsigned level) const = 0;
+};
+
+/** print_functor handler for pointer-to-functions of class T, context type C */
+template <class T, class C>
+class print_ptrfun_handler : public print_functor_impl {
+public:
+ typedef void (*F)(const T &, const C &, unsigned);
+
+ print_ptrfun_handler(F f_) : f(f_) {}
+ print_ptrfun_handler *duplicate() const { return new print_ptrfun_handler(*this); }
+
+ void operator()(const basic & obj, const print_context & c, unsigned level) const
+ {
+ // Call the supplied function
+ f(dynamic_cast<const T &>(obj), dynamic_cast<const C &>(c), level);
+ }
+
+private:
+ F f;
+};
+
+/** print_functor handler for member functions of class T, context type C */
+template <class T, class C>
+class print_memfun_handler : public print_functor_impl {
+public:
+ typedef void (T::*F)(const C & c, unsigned level) const;
+
+ print_memfun_handler(F f_) : f(f_) {}
+ print_memfun_handler *duplicate() const { return new print_memfun_handler(*this); }
+
+ void operator()(const basic & obj, const print_context & c, unsigned level) const
+ {
+ // Call the supplied member function
+ return (dynamic_cast<const T &>(obj).*f)(dynamic_cast<const C &>(c), level);
+ }
+
+private:
+ F f;
+};
+
+/** This class represents a print method for a certain algebraic class and
+ * print_context type. Its main purpose is to hide the difference between
+ * member functions and nonmember functions behind one unified operator()
+ * interface. print_functor has value semantics and acts as a smart pointer
+ * (with deep copy) to a class derived from print_functor_impl which
+ * implements the actual function call. */
+class print_functor {
+public:
+ print_functor() : impl(0) {}
+ print_functor(const print_functor & other) : impl(other.impl.get() ? other.impl->duplicate() : 0) {}
+ print_functor(std::auto_ptr<print_functor_impl> impl_) : impl(impl_) {}
+
+ template <class T, class C>
+ print_functor(void f(const T &, const C &, unsigned)) : impl(new print_ptrfun_handler<T, C>(f)) {}
+
+ template <class T, class C>
+ print_functor(void (T::*f)(const C &, unsigned) const) : impl(new print_memfun_handler<T, C>(f)) {}
+
+ print_functor & operator=(const print_functor & other)
+ {
+ if (this != &other) {
+ print_functor_impl *p = other.impl.get();
+ impl.reset(p ? other.impl->duplicate() : 0);
+ }
+ return *this;
+ }
+
+ void operator()(const basic & obj, const print_context & c, unsigned level) const
+ {
+ (*impl)(obj, c, level);
+ }
+
+ bool is_valid() const { return impl.get(); }
+
+private:
+ std::auto_ptr<print_functor_impl> impl;
+};
+
+
} // namespace GiNaC
#endif // ndef __GINAC_BASIC_H__