Mercurial > octave-nkf
view liboctave/util/action-container.h @ 20651:e54ecb33727e
lo-array-gripes.cc: Remove FIXME's related to buffer size.
* lo-array-gripes.cc: Remove FIXME's related to buffer size. Shorten sprintf
buffers from 100 to 64 characters (still well more than 19 required).
Use 'const' decorator on constant value for clarity. Remove extra space
between variable and array bracket.
author | Rik <rik@octave.org> |
---|---|
date | Mon, 12 Oct 2015 21:13:47 -0700 |
parents | 4197fc428c7d |
children |
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/* Copyright (C) 1993-2015 John W. Eaton Copyright (C) 2009-2010 VZLU Prague This file is part of Octave. Octave is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. Octave is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with Octave; see the file COPYING. If not, see <http://www.gnu.org/licenses/>. */ #if !defined (octave_action_container_h) #define octave_action_container_h 1 // This class allows registering actions in a list for later // execution, either explicitly or when the container goes out of // scope. // FIXME: is there a better name for this class? class action_container { public: // A generic unwind_protect element. Knows how to run itself and // discard itself. Also, contains a pointer to the next element. class elem { public: elem (void) { } virtual void run (void) { } virtual ~elem (void) { } friend class action_container; private: // No copying! elem (const elem&); elem& operator = (const elem&); }; // An element that merely runs a void (*)(void) function. class fcn_elem : public elem { public: fcn_elem (void (*fptr) (void)) : e_fptr (fptr) { } void run (void) { e_fptr (); } private: void (*e_fptr) (void); }; // An element that stores a variable of type T along with a void (*) (T) // function pointer, and calls the function with the parameter. template <class T> class fcn_arg_elem : public elem { public: fcn_arg_elem (void (*fcn) (T), T arg) : e_fcn (fcn), e_arg (arg) { } void run (void) { e_fcn (e_arg); } private: // No copying! fcn_arg_elem (const fcn_arg_elem&); fcn_arg_elem& operator = (const fcn_arg_elem&); void (*e_fcn) (T); T e_arg; }; // An element that stores a variable of type T along with a // void (*) (const T&) function pointer, and calls the function with // the parameter. template <class T> class fcn_crefarg_elem : public elem { public: fcn_crefarg_elem (void (*fcn) (const T&), const T& arg) : e_fcn (fcn), e_arg (arg) { } void run (void) { e_fcn (e_arg); } private: void (*e_fcn) (const T&); T e_arg; }; // An element for calling a member function. template <class T> class method_elem : public elem { public: method_elem (T *obj, void (T::*method) (void)) : e_obj (obj), e_method (method) { } void run (void) { (e_obj->*e_method) (); } private: T *e_obj; void (T::*e_method) (void); // No copying! method_elem (const method_elem&); method_elem operator = (const method_elem&); }; // An element for calling a member function with a single argument template <class T, class A> class method_arg_elem : public elem { public: method_arg_elem (T *obj, void (T::*method) (A), A arg) : e_obj (obj), e_method (method), e_arg (arg) { } void run (void) { (e_obj->*e_method) (e_arg); } private: T *e_obj; void (T::*e_method) (A); A e_arg; // No copying! method_arg_elem (const method_arg_elem&); method_arg_elem operator = (const method_arg_elem&); }; // An element for calling a member function with a single argument template <class T, class A> class method_crefarg_elem : public elem { public: method_crefarg_elem (T *obj, void (T::*method) (const A&), const A& arg) : e_obj (obj), e_method (method), e_arg (arg) { } void run (void) { (e_obj->*e_method) (e_arg); } private: T *e_obj; void (T::*e_method) (const A&); A e_arg; // No copying! method_crefarg_elem (const method_crefarg_elem&); method_crefarg_elem operator = (const method_crefarg_elem&); }; // An element that stores arbitrary variable, and restores it. template <class T> class restore_var_elem : public elem { public: restore_var_elem (T& ref, const T& val) : e_ptr (&ref), e_val (val) { } void run (void) { *e_ptr = e_val; } private: // No copying! restore_var_elem (const restore_var_elem&); restore_var_elem& operator = (const restore_var_elem&); T *e_ptr, e_val; }; // Deletes a class allocated using new. template <class T> class delete_ptr_elem : public elem { public: delete_ptr_elem (T *ptr) : e_ptr (ptr) { } void run (void) { delete e_ptr; } private: T *e_ptr; // No copying! delete_ptr_elem (const delete_ptr_elem&); delete_ptr_elem operator = (const delete_ptr_elem&); }; action_container (void) { } virtual ~action_container (void) { } virtual void add (elem *new_elem) = 0; // Call to void func (void). void add_fcn (void (*fcn) (void)) { add (new fcn_elem (fcn)); } // Call to void func (T). template <class T> void add_fcn (void (*action) (T), T val) { add (new fcn_arg_elem<T> (action, val)); } // Call to void func (const T&). template <class T> void add_fcn (void (*action) (const T&), const T& val) { add (new fcn_crefarg_elem<T> (action, val)); } // Call to T::method (void). template <class T> void add_method (T *obj, void (T::*method) (void)) { add (new method_elem<T> (obj, method)); } // Call to T::method (A). template <class T, class A> void add_method (T *obj, void (T::*method) (A), A arg) { add (new method_arg_elem<T, A> (obj, method, arg)); } // Call to T::method (const A&). template <class T, class A> void add_method (T *obj, void (T::*method) (const A&), const A& arg) { add (new method_crefarg_elem<T, A> (obj, method, arg)); } // Call to delete (T*). template <class T> void add_delete (T *obj) { add (new delete_ptr_elem<T> (obj)); } // Protect any variable. template <class T> void protect_var (T& var) { add (new restore_var_elem<T> (var, var)); } // Protect any variable, value given. template <class T> void protect_var (T& var, const T& val) { add (new restore_var_elem<T> (var, val)); } operator bool (void) const { return ! empty (); } virtual void run_first (void) = 0; void run (size_t num) { if (num > size ()) num = size (); for (size_t i = 0; i < num; i++) run_first (); } void run (void) { run (size ()); } virtual void discard_first (void) = 0; void discard (size_t num) { if (num > size ()) num = size (); for (size_t i = 0; i < num; i++) discard_first (); } void discard (void) { discard (size ()); } virtual size_t size (void) const = 0; bool empty (void) const { return size () == 0; } private: // No copying! action_container (const action_container&); action_container& operator = (const action_container&); }; #endif