X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Farchive.h;h=407581aea6b0d865724f0da630f022ee2a552f6b;hp=af7bbc27721666d1811566b4731c236025354da7;hb=81a315ac1de10724ad963e2a167b7f618b81ac0f;hpb=b09fd05485cbadf6ca63991cd4b8aa3f70f12e78 diff --git a/ginac/archive.h b/ginac/archive.h index af7bbc27..407581ae 100644 --- a/ginac/archive.h +++ b/ginac/archive.h @@ -3,7 +3,7 @@ * Archiving of GiNaC expressions. */ /* - * GiNaC Copyright (C) 1999-2005 Johannes Gutenberg University Mainz, Germany + * GiNaC Copyright (C) 1999-2015 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 @@ -20,15 +20,15 @@ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ -#ifndef __GINAC_ARCHIVE_H__ -#define __GINAC_ARCHIVE_H__ +#ifndef GINAC_ARCHIVE_H +#define GINAC_ARCHIVE_H #include "ex.h" #include +#include #include #include -#include namespace GiNaC { @@ -72,7 +72,17 @@ public: }; typedef std::vector propinfovector; - archive_node() : a(*dummy_ar_creator()), has_expression(false) {} // hack for cint which always requires a default constructor + /** Archived property (data type, name and associated data) */ + struct property { + property() {} + property(archive_atom n, property_type t, unsigned v) : type(t), name(n), value(v) {} + + property_type type; /**< Data type of property. */ + archive_atom name; /**< Name of property. */ + unsigned value; /**< Stored value. */ + }; + typedef std::vector::const_iterator archive_node_cit; + archive_node(archive &ar) : a(ar), has_expression(false) {} archive_node(archive &ar, const ex &expr); @@ -102,10 +112,20 @@ public: * @return "true" if property was found, "false" otherwise */ bool find_string(const std::string &name, std::string &ret, unsigned index = 0) const; + /** Find the location in the vector of properties of the first/last + * property with a given name. */ + archive_node_cit find_first(const std::string &name) const; + archive_node_cit find_last(const std::string &name) const; + /** Retrieve property of type "ex" from node. * @return "true" if property was found, "false" otherwise */ bool find_ex(const std::string &name, ex &ret, lst &sym_lst, unsigned index = 0) const; + /** Retrieve property of type "ex" from the node if it is known + * that this node in fact contains such a property at the given + * location. This is much more efficient than the preceding function. */ + void find_ex_by_loc(archive_node_cit loc, ex &ret, lst &sym_lst) const; + /** Retrieve property of type "ex" from node, returning the node of * the sub-expression. */ const archive_node &find_ex_node(const std::string &name, unsigned index = 0) const; @@ -122,18 +142,6 @@ public: void printraw(std::ostream &os) const; private: - static archive* dummy_ar_creator(); - - /** Archived property (data type, name and associated data) */ - struct property { - property() {} - property(archive_atom n, property_type t, unsigned v) : type(t), name(n), value(v) {} - - property_type type; /**< Data type of property. */ - archive_atom name; /**< Name of property. */ - unsigned value; /**< Stored value. */ - }; - /** Reference to the archive to which this node belongs. */ archive &a; @@ -147,6 +155,86 @@ private: mutable ex e; }; +typedef basic* (*synthesize_func)(); +typedef std::map unarchive_map_t; + +class unarchive_table_t +{ + static int usecount; + static unarchive_map_t* unarch_map; +public: + unarchive_table_t(); + ~unarchive_table_t(); + synthesize_func find(const std::string& classname) const; + void insert(const std::string& classname, synthesize_func f); +}; +static unarchive_table_t unarch_table_instance; + +/** Helper macros to register a class with (un)archiving (a.k.a. + * (de)serialization). + * + * Usage: put + * + * GINAC_DECLARE_UNARCHIVER(myclass); + * + * into the header file (in the global or namespace scope), and + * + * GINAC_BIND_UNARCHIVER(myclass); + * + * into the source file. + * + * Effect: the `myclass' (being a class derived directly or indirectly + * from GiNaC::basic) can be archived and unarchived. + * + * Note: you need to use GINAC_{DECLARE,BIND}_UNARCHIVER incantations + * in order to make your class (un)archivable _even if your class does + * not overload `read_archive' method_. Sorry for inconvenience. + * + * How it works: + * + * The `basic' class has a `read_archive' virtual method which reads an + * expression from archive. Derived classes can overload that method. + * There's a small problem, though. On unarchiving all we have is a set + * of named byte streams. In C++ the class name (as written in the source + * code) has nothing to do with its actual type. Thus, we need establish + * a correspondence ourselves. To do so we maintain a `class_name' => + * `function_pointer' table (see the unarchive_table_t class above). + * Every function in this table is supposed to create a new object of + * the `class_name' type. The `archive_node' class uses that table to + * construct an object of correct type. Next it invokes read_archive + * virtual method of newly created object, which does the actual job. + * + * Note: this approach is very simple-minded (it does not handle classes + * with same names from different namespaces, multiple inheritance, etc), + * but it happens to work surprisingly well. + */ +#define GINAC_DECLARE_UNARCHIVER(classname) \ +class classname ## _unarchiver \ +{ \ + static int usecount; \ +public: \ + static GiNaC::basic* create(); \ + classname ## _unarchiver(); \ + ~ classname ## _unarchiver(); \ +}; \ +static classname ## _unarchiver classname ## _unarchiver_instance + +#define GINAC_BIND_UNARCHIVER(classname) \ +classname ## _unarchiver::classname ## _unarchiver() \ +{ \ + static GiNaC::unarchive_table_t table; \ + if (usecount++ == 0) { \ + table.insert(std::string(#classname), \ + &(classname ## _unarchiver::create)); \ + } \ +} \ +GiNaC::basic* classname ## _unarchiver::create() \ +{ \ + return new classname(); \ +} \ +classname ## _unarchiver::~ classname ## _unarchiver() { } \ +int classname ## _unarchiver::usecount = 0 + /** This class holds archived versions of GiNaC expressions (class ex). * An archive can be constructed from an expression and then written to @@ -231,6 +319,11 @@ public: private: /** Vector of atomized strings (using a vector allows faster unarchiving). */ mutable std::vector atoms; + /** The map of from strings to indices of the atoms vectors allows for + * faster archiving. + */ + typedef std::map::const_iterator inv_at_cit; + mutable std::map inverse_atoms; /** Map of stored expressions to nodes for faster archiving */ typedef std::map::iterator mapit; @@ -241,7 +334,6 @@ private: std::ostream &operator<<(std::ostream &os, const archive &ar); std::istream &operator>>(std::istream &is, archive &ar); - } // namespace GiNaC -#endif // ndef __GINAC_ARCHIVE_H__ +#endif // ndef GINAC_ARCHIVE_H