X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Fprint.h;h=85e0fad78a1a590f63e8c1de006609e92f51828d;hp=54b6ca719531b0349174278cd630806c5730618b;hb=bba767a9045e24989c9de04a4453e5bdf1069f6a;hpb=c8feefe95a6c219195aea22050f17e2294656f32

diff --git a/ginac/print.h b/ginac/print.h
index 54b6ca71..85e0fad7 100644
--- a/ginac/print.h
+++ b/ginac/print.h
@@ -3,7 +3,7 @@
  *  Definition of helper classes for expression output. */
 
 /*
- *  GiNaC Copyright (C) 1999-2003 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2004 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
@@ -25,6 +25,7 @@
 
 #include <iosfwd>
 #include <string>
+#include <memory>
 
 #include "class_info.h"
 
@@ -67,19 +68,24 @@ public:
 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;
 
@@ -176,6 +182,94 @@ template <class T>
 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);
+
+	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)) : 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__