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+/*
+ * (C) Copyright Christopher Diggins 2005
+ * (C) Copyright Pablo Aguilar 2005
+ * (C) Copyright Kevlin Henney 2001
+ *
+ * Copyright (C) 2010-2011 IOhannes m zmölnig. forum::für::umläute. IEM. zmoelnig@iem.at
+ * downloaded this code from http://www.codeproject.com/KB/cpp/dynamic_typing.aspx
+ * changed namespace/defines "cdiggins" to something "gem"
+ *
+ * Distributed under the Boost Software License, Version 1.0. (See
+ * accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ */
+
+#ifndef GEM_ANY_HPP
+#define GEM_ANY_HPP
+
+#include "Gem/ExportDef.h"
+
+#ifdef _MSC_VER
+# pragma warning( push )
+# pragma warning( disable: 4275 )
+#endif
+
+#include <stdexcept>
+#include <typeinfo>
+#include <algorithm>
+
+
+namespace gem
+{
+ struct GEM_EXTERN bad_any_cast : std::bad_cast {
+ bad_any_cast(const std::type_info& src, const std::type_info& dest)
+ : from(src.name()), to(dest.name())
+ { }
+ virtual ~bad_any_cast(void) throw()
+ { }
+ virtual const std::string what(void) {
+ std::string result = std::string("bad cast(");
+ result+= from;
+ result+= std::string("->");
+ result+= to;
+ result+= std::string(")");
+ return result;
+ }
+ const std::string from;
+ const std::string to;
+ };
+
+ namespace any_detail {
+ // function pointer table
+
+ struct fxn_ptr_table {
+ const std::type_info& (*get_type)(void);
+ void (*static_delete)(void**);
+ void (*clone)(void* const*, void**);
+ void (*move)(void* const*,void**);
+ };
+
+ // static functions for small value-types
+
+ template<bool is_small>
+ struct fxns
+ {
+ template<typename T>
+ struct type {
+ static const std::type_info& get_type(void) {
+ return typeid(T);
+ }
+ static void static_delete(void** x) {
+ reinterpret_cast<T*>(x)->~T();
+ }
+ static void clone(void* const* src, void** dest) {
+ new(dest) T(*reinterpret_cast<T const*>(src));
+ }
+ static void move(void* const* src, void** dest) {
+ reinterpret_cast<T*>(dest)->~T();
+ *reinterpret_cast<T*>(dest) = *reinterpret_cast<T const*>(src);
+ }
+ };
+ };
+
+ // static functions for big value-types (bigger than a void*)
+
+ template<>
+ struct fxns<false>
+ {
+ template<typename T>
+ struct type {
+ static const std::type_info& get_type(void) {
+ return typeid(T);
+ }
+ static void static_delete(void** x) {
+ delete(*reinterpret_cast<T**>(x));
+ }
+ static void clone(void* const* src, void** dest) {
+ *dest = new T(**reinterpret_cast<T* const*>(src));
+ }
+ static void move(void* const* src, void** dest) {
+ (*reinterpret_cast<T**>(dest))->~T();
+ **reinterpret_cast<T**>(dest) = **reinterpret_cast<T* const*>(src);
+ }
+ };
+ };
+
+ template<typename T>
+ struct get_table
+ {
+ static const bool is_small = sizeof(T) <= sizeof(void*);
+
+ static fxn_ptr_table* get(void)
+ {
+ static fxn_ptr_table static_table = {
+ fxns<is_small>::template type<T>::get_type
+ , fxns<is_small>::template type<T>::static_delete
+ , fxns<is_small>::template type<T>::clone
+ , fxns<is_small>::template type<T>::move
+ };
+ return &static_table;
+ }
+ };
+
+ struct empty {
+ };
+ } // namespace any_detail
+
+
+ struct GEM_EXTERN any
+ {
+ // structors
+
+ template <typename T>
+ any(const T& x) : table(NULL), object(NULL) {
+ table = any_detail::get_table<T>::get();
+ if (sizeof(T) <= sizeof(void*)) {
+ new(&object) T(x);
+ }
+ else {
+ object = new T(x);
+ }
+ }
+
+ any(void) : table(NULL), object(NULL) {
+ table = any_detail::get_table<any_detail::empty>::get();
+ object = NULL;
+ }
+
+ any(const any& x) : table(NULL), object(NULL) {
+ table = any_detail::get_table<any_detail::empty>::get();
+ assign(x);
+ }
+
+ virtual ~any(void) {
+ table->static_delete(&object);
+ }
+
+ // assignment
+
+ any& assign(const any& x) {
+ // are we copying between the same type?
+
+ if (table == x.table) {
+ // if so, we can avoid reallocation
+
+ table->move(&x.object, &object);
+ }
+ else {
+ reset();
+ x.table->clone(&x.object, &object);
+ table = x.table;
+ }
+ return *this;
+ }
+
+ template <typename T>
+ any& assign(const T& x)
+ {
+ // are we copying between the same type?
+
+ any_detail::fxn_ptr_table* x_table = any_detail::get_table<T>::get();
+ if (table == x_table) {
+ // if so, we can avoid deallocating and resuse memory
+
+ if (sizeof(T) <= sizeof(void*)) {
+ // create copy on-top of object pointer itself
+
+ new(&object) T(x);
+ }
+ else {
+ // create copy on-top of old version
+
+ new(object) T(x);
+ }
+ }
+ else {
+ reset();
+ if (sizeof(T) <= sizeof(void*)) {
+ // create copy on-top of object pointer itself
+
+ new(&object) T(x);
+ // update table pointer
+
+ table = x_table;
+ }
+ else {
+ object = new T(x);
+ table = x_table;
+ }
+ }
+ return *this;
+ }
+
+ // assignment operator
+
+ template<typename T>
+ any& operator=(T const& x) {
+ return assign(x);
+ }
+ any& operator=(const any& x) {
+ return assign(x);
+ }
+
+ // utility functions
+
+ any& swap(any& x) {
+ std::swap(table, x.table);
+ std::swap(object, x.object);
+ return *this;
+ }
+
+ const std::type_info& get_type(void) const {
+ return table->get_type();
+ }
+
+ template<typename T>
+ const T& cast(void) const {
+ if (get_type() != typeid(T)) {
+ throw bad_any_cast(get_type(), typeid(T));
+ }
+ if (sizeof(T) <= sizeof(void*)) {
+ return *reinterpret_cast<T const*>(&object);
+ }
+ else {
+ return *reinterpret_cast<T const*>(object);
+ }
+ }
+
+ // implicit casting is disabled by default
+
+ #ifdef ANY_IMPLICIT_CASTING
+ // automatic casting operator
+
+ template<typename T>
+ operator T(void) const {
+ return cast<T>();
+ }
+ #endif // implicit casting
+
+
+ bool empty(void) const {
+ return table == any_detail::get_table<any_detail::empty>::get();
+ }
+
+ void reset(void)
+ {
+ if (empty()) return;
+ table->static_delete(&object);
+ table = any_detail::get_table<any_detail::empty>::get();
+ object = NULL;
+ }
+
+ // fields
+
+ any_detail::fxn_ptr_table* table;
+ void* object;
+ };
+
+ // boost::any-like casting
+
+ template<typename T>
+ T* any_cast(any* this_) {
+ if (this_->get_type() != typeid(T)) {
+ throw bad_any_cast(this_->get_type(), typeid(T));
+ }
+ if (sizeof(T) <= sizeof(void*)) {
+ return reinterpret_cast<T*>(&this_->object);
+ }
+ else {
+ return reinterpret_cast<T*>(this_->object);
+ }
+ }
+
+ template<typename T>
+ T const* any_cast(any const* this_) {
+ return any_cast<T>(const_cast<any*>(this_));
+ }
+
+ template<typename T>
+ T const& any_cast(any const& this_){
+ return *any_cast<T>(const_cast<any*>(&this_));
+ }
+}
+
+#ifdef _MSC_VER
+# pragma warning( pop )
+#endif
+
+#endif // GEM_ANY_HPP