One of the naive approaches is to use cascading if statements, calling dynamic_pointer_cast to check if *p is of a specific derived class. Thanks for your answer and your nice article! There is also the Cygwin or MinGW options, but while they are nice they really cannot be called a representative picture of how g++ performs. } Share Follow I'm starting to work with smart pointers in C++0X/11 and I've run into a peculiar situation. I might just use dynamic_cast instead no matter what. If sp is not empty, and such a cast would not return a null pointer, the returned object shares ownership over sp 's resources, increasing by one the use count. static short typeId = TypeId(); boost::dynamic_pointer_cast returning null on valid cast. The operating system doesn't care about this, but if a user wants to send and receive an array of some other type, presenting it as an array of bytes which supports bitwise . Tip; const_buffer and mutable_buffer are preferred over std:: span < byte > and span < byte const > because std:: span does too much. For shared_ptrthere is std::dynamic_pointer_cast<>(http://en.cppreference.com/w/cpp/memory/shared_ptr/pointer_cast) Casting unique_ptr The simplest way would seem: #include <memory> struct A { virtual ~A() = default; }; struct B : A { }; int main() { std::unique_ptr<A> pa(new B); [] . Following is the declaration for std::dynamic_pointer_cast. Otherwise, the returned object is an empty shared_ptr. What happens to other pointers to the object? Reinterpreting memory is only legal . A performance comparison of the speed of dynamic_cast operations in C++. What is the difference between 'typedef' and 'using' in C++11? yeah I figured this out when I tried calling a method from class extend. Idea from http://www.nerdblog.com/2006/12/how-slow-is-dynamiccast.html, who did not provide any source so I wrote my own more extensive tests. dynamic_cast, static_cast and reinterpret_cast can all three be used to cast a base class pointer or reference into a pointer or reference to a more derived class. This process is called downcasting. To learn more, see our tips on writing great answers. Also, a void* can be typecasted back to a pointer of any type: void* vp = new int(); // OK int* ip = static_cast<int*> (vp); //OK with typecast. I think it is worth noting that reinterpret_cast is a null-cost operation from the CPU point of view since it does not translate to any actual machine code after compilation. A template class named MyArray. 2) I recently encountered another technique at http://ciaranm.wordpress.com/2010/05/24/runtime-type-checking-in-c-without-rtti/ that assigns a unique integer to each type: short TypeId() { When should static_cast, dynamic_cast, const_cast, and reinterpret_cast be used? std::dynamic_pointer_cast class D:public B { }; ,BDDBstd::dynamic_pointer_castshared_ptrstd::unique_ptr,c++ : template <typename To, typename From, typename Deleter> std::unique_ptr<To, Deleter> dynamic_unique_cast (std::unique_ptr<From, Deleter>&& p) { What is std::move(), and when should it be used? I took the RTTI/dynamic_cast example from C++ Primer Plus (5th ed), Stephen Prata that uses C-style pointers and tried to get it working with std::shared_ptr. Just one little thing: in this context reinterpret_cast is a recipe for disaster. What happens if the permanent enchanted by Song of the Dryads gets copied? If the cast fails and new-type is a pointer type, it returns a null pointer of that type. It does things like implicit conversions between types (such as int to float, or pointer to void*), and it can also call explicit conversion functions (or implicit ones). std:: static_pointer_cast, std:: dynamic_pointer_cast, std:: const_pointer_cast, std:: reinterpret_pointer_cast C++ Utilities library Dynamic memory management std::shared_ptr Creates a new instance of std::shared_ptr whose stored pointer is obtained from r 's stored pointer using a cast expression. Are the S&P 500 and Dow Jones Industrial Average securities? I noticed that every time I try to do dynamic casting from parent class to derived class I get a nullptr back from std::dynamic_pointer_cast. Since you are basically just resetting obj, if obj is the last shared pointer to the object created through make_shared<>(), this object will be destroyed after the assignment above is performed. (see Alexandrescu). Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Given class B {}; class D : B {} the conversion from a B* to a D* is. dynamic_cast C++ provides a casting operator named dynamic_cast that can be used for just this purpose. What you measure here is the cost of the benchmark loop itself as well as the call to getType(), which you dont need to do if you know the actual type of the object. Of course this works for complex types as well. Let Y be typename std::shared_ptr::element_type, then the resulting std::shared_ptr's stored pointer will be obtained by evaluating, respectively: The behavior of these functions is undefined unless the corresponding cast from U* to T* is well formed: The expressions std::shared_ptr(static_cast(r.get())), std::shared_ptr(dynamic_cast(r.get())) and std::shared_ptr(const_cast(r.get())) might seem to have the same effect, but they all will likely result in undefined behavior, attempting to delete the same object twice! }, template 3) Constructor must insure that specified capacity is possible. If r is empty, so is the new shared_ptr (but its stored pointer is not necessarily null). The pointer casts for std::shared_ptr are aliases of the corresponding standard functions with the same names and equivalent to the functions taking boost::shared_ptr. Not the answer you're looking for? #include #include char* read_string_from_terminal ()//reads a string of variable length and returns a pointer to it { int length = 0; //counts number of characters char c ; //holds. Let Y be typename std::shared_ptr::element_type, then the resulting std::shared_ptr's stored pointer will be obtained by calling (in respective order): The behavior of these functions is undefined unless the corresponding cast from U* to T* is well formed: The expressions std::shared_ptr(static_cast(r.get())), std::shared_ptr(dynamic_cast(r.get())) and std::shared_ptr(const_cast(r.get())) might seem to have the same effect, but they all will likely result in undefined behavior, attempting to delete the same object twice! Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. // ValueNamePart is a class derived from RegPartBase. Otherwise, the new shared_ptr will share ownership with r, except that it is empty if the dynamic_cast performed by dynamic_pointer_cast returns a null pointer. So you did not lose the point. Given that dynamic_cast can only incur one (L3 maybe?) In C++, a pointer to a specific type (primitive or user-defined) can be assigned to a void* without an explicit typecast. It is not possible to directly use static_cast, const_cast, dynamic_cast and reinterpret_cast on std::shared_ptr to retrieve a pointer sharing ownership with the pointer being passed as argument. What I've been trying to do is up-cast a class member from base to extend. How does legislative oversight work in Switzerland when there is technically no "opposition" in parliament? std :: dynamic_pointer_cast(boost :: dynamic_pointer_cast)[] dynamic_pointer_cast@Caleth 's push_back/ remove,only_derived1dynamic_pointer_castin doSomethingForDerivedObject1()MyClass.DerivedObject3,. Why is Singapore currently considered to be a dictatorial regime and a multi-party democracy by different publications? All trademarks and copyrights remain the property of their respective owners. EDIT: Thank you for the answers. Access to field 'ref_time' results in a dereference of a null pointer (loaded from variable 'current_frame') Annotated Source Code Press '?' to see keyboard shortcuts Where did I lose the point? Are defenders behind an arrow slit attackable? Although to be avoided when possible, applications sometimes need to perform explicit RTTI. std::shared_ptr<Base> base = std::dynamic_pointer_cast<Base> (derived); shared_ptr int main(void) { std::shared_ptr<Derived> derived = std::make_shared<Derived> (); { std::shared_ptr<Base> base = std::dynamic_pointer_cast<Base> (derived); // 2 std::unique_ptr<BaseSession> ptr; // Initialize it with correct value Func (dynamic_cast<DerivedSessionA*> (ptr.get ())); Or as you seems to call it directly from a method in BaseSession: Func (dynamic_cast<DerivedSessionA*> (this)); Jarod42 191851 score:-1 Simply get the stored pointer using the std::unique_ptr<>::get () method: r std::shared_ptr r shared_ptr null Counterexamples to differentiation under integral sign, revisited. cout << TypeId() << endl; Try it with multiple inheritance and youll see what I mean ;-). How can you know the sky Rose saw when the Titanic sunk? Japanese girlfriend visiting me in Canada - questions at border control? The function can only cast types for which the following expression would be valid: 0 Dynamic cast with std::shared_ptr. // because eventpp::argumentAdapter uses std::static_pointer_cast to cast the pointer and it doesn't // work on reference. Dangling pointers Memory leaks Pointers indirection 1D and 2D Dynamic Arrays Allocation and Deallocation String Operations and CString. Anti-spam word: (Required)* Description It allocates memory for an object of type T using alloc and constructs it passing args to its constructor. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Funnily enough the compiler didn't complain about the line where I was up-casting. wheelspin models re2 lab walkthrough Sorry for being a bit harsh, but for the love of silicon, write C or write good, modern C++. Connect and share knowledge within a single location that is structured and easy to search. If the cast fails and new-type is a reference type, it throws an exception that matches a handler of type std::bad_cast . Any more than you could use dynamic_cast on a new Base to make it into something that it isn't. 4-5) If operand is not a null pointer, and the typeid of the requested T matches that of the contents of operand , a pointer to the value contained by operand, otherwise a null pointer. The c++ standard allows such casting to take place. Pick one. C++ ,c++,pointers,dynamic,vector,constructor,C++,Pointers,Dynamic,Vector,Constructor, Which means that you can't: obj = std::dynamic_pointer_cast<Extend> (obj); Any more than you could use dynamic_cast on a new Base to make it into something that it isn't. Also maintaining 16 lines of switch..case is a pain in the ass. How can I use a VPN to access a Russian website that is banned in the EU? }, int main() { What I sort of wanted was: But it makes no sense at all, instead I'll just use an object factory. In C++, dynamic casting is mainly used for safe downcasting at run time. No it isn't out of the question, but you can only down cast to a super type if the underlying object really is of that type. To prove you're a person (not a spam script), type the security word shown in the picture. std::make_shared<Base> (); Will, under the covers call: new Base. static short typeId = 0; cache miss, and this 16 lines of switch..case function may as well cause at least L1i$ miss, maybe the performance is neglectable somehow? template <class T, class U> shared_ptr<T> dynamic_pointer_cast (const shared_ptr<U>& sp) noexcept; C++11 template <class T, class U> shared_ptr<T> dynamic_pointer_cast (const shared_ptr<U>& sp) noexcept; Parameters sp Its a shared pointer. The assignment itself is legal, since you can assign a (smart) pointer to a derived class to a (smart) pointer to a base class. As shown above, dynamic_cast checks if the dynamic type of the object is of the expected class. short TypeId() { Theme based on GreenTrack | Powered By WordPress, http://www.nerdblog.com/2006/12/how-slow-is-dynamiccast.html, http://ciaranm.wordpress.com/2010/05/24/runtime-type-checking-in-c-without-rtti/, member variable access + reinterpret_cast, successful dynamic_cast from the derived levels to lower levels, failed dynamic_cast from the derived levels to an unrelated type, dynamic_cast is slow for anything but casting to the base type; that particular cast is optimized out, the inheritance level has a big impact on dynamic_cast, member variable + reinterpret_cast is the fastest reliable way to determine type; however, that has a lot higher maintenance overhead when coding, Arch: Linux 2.6.27 x86_64, 2.66GHz Xeon, 8 GiB RAM, Arch: Windows 7 64 bit, 1.83GHz Core2Duo, 4 GiB RAM. However: Yes, it is safe, but since you are trying to downcast a pointer to an object whose run-time type is not Extend, you will get a null pointer in return. Having to reboot to Linux just to re-run the tests would be painful. Regular cast vs. static_cast vs. dynamic_cast in C++ 3. . Difference in make_shared and normal shared_ptr in C++, Using std::shared_ptr to point to anything. I have implemented the following: type; type pointer type; pointer type ; C-style cast (Regular Cast) What happens to other pointers to the object ? std:: static_pointer_cast template <class T, class U> shared_ptr<T> static_pointer_cast (const shared_ptr<U>& sp) noexcept; Static cast of shared_ptr Returns a copy of sp of the proper type with its stored pointer casted statically from U* to T*. How do I arrange multiple quotations (each with multiple lines) vertically (with a line through the center) so that they're side-by-side? return typeId; Instead, the functions std::static_pointer_cast, std::const_pointer_cast, std::dynamic_pointer_cast and std::reinterpret_pointer_cast should be used: . If sp is empty, the returned object is an empty shared_ptr. Casting can't suddenly give your underlying object new properties. 7) Scoped enumeration type can be converted to an integer or floating-point type. 1) MyArray is a dynamic partially filled array for primitive types. Class Extend inherits from class Base, where Base class has a virtual destructor in order to make it polymorphic (otherwise dynamic_pointer_cast complains about non-polymorphic class casting). *broonie-ci:fileLdtXWt 41/42] sound/soc/codecs/max98396.c:1736:42: warning: initialization of 'const struct i2c_device_id *' from 'int' makes pointer from integer . on 27 Oct 2010 at 09:16:25 4.Cyril said . We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. Creates a new instance of std::shared_ptr whose stored pointer is obtained from r's stored pointer using a cast expression. on 27 Oct 2010 at 13:43:04 5.Tino Didriksen said . However, since the right side of the assignment evaluates to a null pointer (because of what written above), you will eventually get a null pointer assigned to obj. You'll need to make_shared and then pass it around using a shared_ptr. Exit the program an illegal value is specified. There would have to be some sort of a move_with_cast function to move the pointer and cast it at the same time. unique_ptr<RegPartBase> p1(new ValueNamePart(L"abc")) ; unique_ptr<ValueNamePart> p2( dynamic_cast<ValueNamePart*> (p1)) ; // RegPartBase is the base class. Although dynamic casts have a few different capabilities, by far the most common use for dynamic casting is for converting base-class pointers into derived-class pointers. I only have one simple question: is fat pointer destined to be faster than dynamic_cast? Click on the picture to hear an audio file of the word. Thank you. The wrinkle is that dynamic_casting a pointer could fail (yield nullptr ), so what do we want to happen then? This is not an up-cast, but a down-cast (you're casting from a less to a more derived class). Part of the point was that it is much much faster to code around dynamic_cast any way you can, including designing the program so that you will always know the type. Btw, Qt users should always resort to qobject_cast instead, which only does a pointer comparison by inheritance level. It is released under the terms of the Mozilla Public License version 2.0 or the Gnu General Public License version 3 or later. Thanks for contributing an answer to Stack Overflow! rev2022.12.11.43106. TASK 1: A dangling pointer is some variable that points to some memory that was deleted (or freed). Otherwise, the new shared_ptr will share ownership with r, except that it is empty if the dynamic_cast performed by dynamic_pointer_cast returns a null pointer. The context is that one project I was told to maintain has this 16 lines of switch..case to determine the real type of a fat pointer. As an analogy, a page number in a book's . Not sure what you mean here, the formulation of this question probably stems from the above misconception. std:: static_pointer_cast, std:: dynamic_pointer_cast, std:: const_pointer_cast, std:: reinterpret_pointer_cast From cppreference.com < cpp | memory | shared ptr C++ Compiler support Freestanding and hosted Language Standard library Standard library headers Named requirements Feature test macros (C++20) Language support library What happens if you score more than 99 points in volleyball? 3) Returns static_cast < T > (std:: move (* std:: any_cast < U > (& operand))). // This is for demonstration purpose, in production you may use a better way than dynamic_cast. std::make_shared<Base> (); Will, under the covers call: new Base. 6) If conversion of expression to new-type involves lvalue-to-rvalue, array-to-pointer, or function-to-pointer conversion, it can be performed explicitly by static_cast. Should we pass a shared_ptr by reference or by value? shared_ptr<DerivedClass> derived_ptr (dynamic_cast<DerivedClass*> (base_shared_ptr.get ())); This is because internally, the shared_ptr must be using some representative that 'counts' the references, and when you supply the pointer to the underlying object you're bypassing the reference counter. Would salt mines, lakes or flats be reasonably found in high, snowy elevations? Dynamic_cast implementation principle, Programmer Sought, the best programmer technical posts sharing site. std::shared_ptr std::shared_ptr r r shared_ptr shared_ptr r dynamic_pointer_cast dynamic_cast Y typename std::shared_ptr<T>::element_type std::shared_ptr 1-2) static_cast<Y*>(r.get()) Plus, the tests I do are not about compiler vs. compiler; theyre about general methods and which ones reliably perform well cross-platform. // static_pointer_cast to go up class hierarchy, // dynamic_pointer_cast to go down/across class hierarchy, // All pointers to derived share ownership, https://en.cppreference.com/mwiki/index.php?title=cpp/memory/shared_ptr/pointer_cast&oldid=99203. dynamic_pointer_cast is defined in header memory. I decided that in that case I would like the original pointer to remain unchanged. on 08 Apr 2020 at 05:24:54 8.freealibi said . To subscribe to this RSS feed, copy and paste this URL into your RSS reader. It not only type-erases the original pointer but also recasts it to a pointer-to-byte. The real reason I was asking this question was to handle XML documents usign a SAX parser, but I got carried away with up/down casting. Then do dynamic_pointer_cast again to promote the pointer, to access its members. on 08 Jun 2018 at 07:35:38 7.Martin said . Several techniques exist to improve upon the performance of using dynamic_cast for this purpose: 1) Wite a wrapper around type_info that allows comparison, assignment, etc. Is only obj treating it as Extend, while other shared pointers will still treat it as Base? 2 cout << TypeId() << endl; The final question is surely about type-casting. However, this instruction: Will make obj a null pointer. . I edited my answer. Looks like on MSVC, dynamic_casts are implemented with ugly recursive strcmps. The pointer casts for std::unique_ptr are documented below. Which means that you can't: obj = std::dynamic_pointer_cast<Extend> (obj); Any more than you could use dynamic_cast on a new Base to make it into something that it isn't. You'll need to make_shared<Extend> and then pass it around using a shared_ptr<Base>. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. applies dynamic_cast to the stored pointer dynamic_pointer_cast can be used in the following way: Copy autosortSort = std::dynamic_pointer_cast<SortSort>(_expr.arguments.at(0).sort); The full source code is listed as follows: Copy /*//www.demo2s.comThis file is part of solidity. dynamic_pointer_cast is only implemented for std::shared_ptr. Dynamic Cast: A cast is an operator that converts data from one type to another type. Return Value I want to up cast an instance of an object using shared_ptr. I need the same functionality for unique pointers. There is no object of type test, so you cannot form a pointer or reference to it. Was the ZX Spectrum used for number crunching? dynamic_cast < new-type > ( expression ) If the cast is successful, dynamic_cast returns a value of type new-type. rel_ops::operator!= rel_ops::operator> rel_ops::operator<= rel_ops::operator>= (Updated 2010-10-27: Re-run the test with latest clang++ from subversion). eventpp:: . The type of the pointed object (of any object) is determined at compile-time and won't change. 2) data members: - a pointer for the array - any associated variables needed to manage the array. I bet that static_cast has the same performance in simple cases and just makes an ADD or SUB when multiple inheritance is involved. Indeed. Is only obj treating it as Extend, while other shared pointers will still treat it as Base? You can only down cast to a super type if the underlying object really is of that type. Question: 1. MOSFET is getting very hot at high frequency PWM. 0. Right now, I can develop and run the tests simultaneously on my own Windows computer and via SSH on the Linux machine. std::shared_ptr<Obstacle> o(new SnakeTeleportMorph(rect(0, 0, 0, 0))); std::shared_ptr<SnakeControllerMorph> t = std::dynamic_pointer_cast<SnakeControllerMorph>(o); This compiles, but t will always be a null pointer, even though SnakeControllerMorph derives from Obstacle. A Computer Science portal for geeks. Declaration Following is the declaration for std::static_pointer_cast. on 27 Oct 2010 at 13:52:08 6.Cyril said . So what is the difference between the three? Returns a copy of sp of the proper type with its stored pointer const casted from U* to T*. Casting can't suddenly give your underlying object new properties. Subscribe to the comments through RSS Feed. We use dynamic_cast to check if the event is desired. How do I put three reasons together in a sentence? cout << TypeId() << endl; Can virent/viret mean "green" in an adjectival sense? In the program below the counterpart raw pointer code is beneath each corresponding use of the smart pointer: // ptr_to_base->f(); // Error won't compile: BaseClass has no member named 'f', // (constructs a temporary shared_ptr, then calls operator->), // (direct cast, does not construct a temporary shared_ptr), http://en.cppreference.com/mwiki/index.php?title=cpp/memory/shared_ptr/pointer_cast&oldid=91808, Pages with unreviewed unconditional noexcept template. You have a misconception here: downcasting a pointer to an object doesn't transform the object. Example. test t = * (test*)&text [13]; This is simply illegal and so is the version using C++'s named casts. All rights reserved. 1 Explanation Find centralized, trusted content and collaborate around the technologies you use most. rel_ops::operator!= rel_ops::operator> rel_ops::operator<= rel_ops::operator>= I think it would be interesting to compare the performance of these techniques to dynamic_cast for the purpose of explicit RTTI. Not sure if it was just me or something she sent to the whole team. Making statements based on opinion; back them up with references or personal experience. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Copyright 2000-2022 Tino Didriksen. static_pointer_cast template<class T, class U> unique_ptr<T> static_pointer_cast (unique_ptr<U>&& r); // never throws Why would Henry want to close the breach? Are the days of passing const std::string & as a parameter over? Implement the following: a. This property of void* makes it quite useful as a generic or opaque handle. This is just to show new coders how horribly slow dynamic_cast is and why they should design to avoid it. Write a program that declares a pointer (any type), allocate it some memory then delete it. If I rewrite the code to use bare pointers and dynamic_cast it works . on 01 Oct 2010 at 17:06:19 3.Steven Lubars said . , ranges::uninitialized_default_construct_n, // ptr_to_base->f(); // BaseClass 'f' , // shared_ptr operator-> , // shared_ptr . dynamic_cast is slow for anything but casting to the base type; that particular cast is optimized out the inheritance level has a big impact on dynamic_cast member variable + reinterpret_cast is the fastest reliable way to determine type; however, that has a lot higher maintenance overhead when coding Linux: GNU g++ 4.4.1 Why is "using namespace std;" considered bad practice? cout << TypeId() << endl; So up-casting a std::shared_ptr is out of the question ? . Dynamic cast of shared_ptr Returns a copy of sp of the proper type with its stored pointer casted dynamically from U* to T*. Creates a new instance of std::shared_ptr whose stored pointer is obtained from r's stored pointer using a cast expression. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. confusion between a half wave and a centre tapped full wave rectifier, Received a 'behavior reminder' from manager. return typeId++; When the target type is bool (possibly cv-qualified), the result is false if the original . Casting can't suddenly give your underlying object new properties. Over the years, there have been many who have wanted to compile the Android platform with the Snapdragon LLVM Compiler, which has several performance enhancements for Snapdragon c Is it safe to up-cast same instance or should I do something else ? In computer science, a pointer is an object in many programming languages that stores a memory address.This can be that of another value located in computer memory, or in some cases, that of memory-mapped computer hardware.A pointer references a location in memory, and obtaining the value stored at that location is known as dereferencing the pointer. If r is empty, so is the new shared_ptr (but its stored pointer is not necessarily null). Dont do whatever this is. Asking for help, clarification, or responding to other answers. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. If the object is not of the target type, you won't get a downcasted pointer to it. When would I give a checkpoint to my D&D party that they can return to if they die? 39 comments andreya108 commented on Sep 13, 2017 NDK Version: 16..4293906-beta1 Build sytem: ndk-build + cmake + standalone toolchain Host OS: Ubuntu 16.04 Compiler: clang c++14 ABI: arm64-v8a dynamic_cast:dynamic_cast. If sp is not empty, the returned object shares ownership over sp's resources, increasing by one the use count. yes of course, and I just realized that I'm going at it the wrong way. clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name rtp_player . dynamic_pointer_cast can be used in the following way: Copy auton = std::dynamic_pointer_cast<Node>(s); The full source code is listed as follows: Copy /**Copyright (C) Austin Hicks, 2014-2016 This code is dual-licensed. The function returns an object of type shared_ptr that owns and stores a pointer to the constructed object. @RobKennedy: I see, thank you for clarifying. What is this fallacy: Perfection is impossible, therefore imperfection should be overlooked. Would it be possible, given current technology, ten years, and an infinite amount of money, to construct a 7,000 foot (2200 meter) aircraft carrier? I first noticed this problem back in NDK 10e, I was able to bypass the issue by always rebuilding the c++ runtime with this directive in Application.mk up-casting std::shared_ptr using std::dynamic_pointer_cast. on 16 Apr 2010 at 14:53:31 1.Jorn said , It would be nice to see windows tested on a comparable machine, on 16 Apr 2010 at 18:12:56 2.Tino Didriksen said , I agree, but that would be a lot of extra work. 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