Where did I lose the point? 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 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 You have a misconception here: downcasting a pointer to an object doesn't transform the object. Exit the program an illegal value is specified. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. Should we pass a shared_ptr by reference or by value? Are the S&P 500 and Dow Jones Industrial Average securities? It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. Returns a copy of sp of the proper type with its stored pointer const casted from U* to T*. C++ ,c++,pointers,dynamic,vector,constructor,C++,Pointers,Dynamic,Vector,Constructor, on 27 Oct 2010 at 13:52:08 6.Cyril said . How does legislative oversight work in Switzerland when there is technically no "opposition" in parliament? // This is for demonstration purpose, in production you may use a better way than dynamic_cast. However, this instruction: Will make obj a null pointer. Return Value By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. So up-casting a std::shared_ptr is out of the question ? Just one little thing: in this context reinterpret_cast is a recipe for disaster. In C++, a pointer to a specific type (primitive or user-defined) can be assigned to a void* without an explicit typecast. 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). Difference in make_shared and normal shared_ptr in C++, Using std::shared_ptr to point to anything. 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. 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. Are the days of passing const std::string & as a parameter over? So you did not lose the point. This process is called downcasting. Why is "using namespace std;" considered bad practice? The final question is surely about type-casting. . Is it safe to up-cast same instance or should I do something else ? 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*. . 1) MyArray is a dynamic partially filled array for primitive types. I bet that static_cast has the same performance in simple cases and just makes an ADD or SUB when multiple inheritance is involved. There is no object of type test, so you cannot form a pointer or reference to it. // ValueNamePart is a class derived from RegPartBase. 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. How can you know the sky Rose saw when the Titanic sunk? eventpp:: . What is std::move(), and when should it be used? Connect and share knowledge within a single location that is structured and easy to search. Dynamic cast with std::shared_ptr. How can I use a VPN to access a Russian website that is banned in the EU? 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. When would I give a checkpoint to my D&D party that they can return to if they die? on 01 Oct 2010 at 17:06:19 3.Steven Lubars said . Was the ZX Spectrum used for number crunching? 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 This property of void* makes it quite useful as a generic or opaque handle. 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. Making statements based on opinion; back them up with references or personal experience. The type of the pointed object (of any object) is determined at compile-time and won't change. on 08 Apr 2020 at 05:24:54 8.freealibi said . The wrinkle is that dynamic_casting a pointer could fail (yield nullptr ), so what do we want to happen then? boost::dynamic_pointer_cast returning null on valid cast. 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) { (Updated 2010-10-27: Re-run the test with latest clang++ from subversion). Try it with multiple inheritance and youll see what I mean ;-). TASK 1: A dangling pointer is some variable that points to some memory that was deleted (or freed). The function returns an object of type shared_ptr that owns and stores a pointer to the constructed object. 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. Is only obj treating it as Extend, while other shared pointers will still treat it as Base? cache miss, and this 16 lines of switch..case function may as well cause at least L1i$ miss, maybe the performance is neglectable somehow? 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. 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. You can only down cast to a super type if the underlying object really is of that type. 2 Thanks for contributing an answer to Stack Overflow! std :: dynamic_pointer_cast(boost :: dynamic_pointer_cast)[] dynamic_pointer_cast@Caleth 's push_back/ remove,only_derived1dynamic_pointer_castin doSomethingForDerivedObject1()MyClass.DerivedObject3,. Reinterpreting memory is only legal . Plus, the tests I do are not about compiler vs. compiler; theyre about general methods and which ones reliably perform well cross-platform. If sp is not empty, the returned object shares ownership over sp's resources, increasing by one the use count. If the cast fails and new-type is a pointer type, it returns a null pointer of that type. It not only type-erases the original pointer but also recasts it to a pointer-to-byte. static_pointer_cast template<class T, class U> unique_ptr<T> static_pointer_cast (unique_ptr<U>&& r); // never throws MOSFET is getting very hot at high frequency PWM. rel_ops::operator!= rel_ops::operator> rel_ops::operator<= rel_ops::operator>= #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. The function can only cast types for which the following expression would be valid: What happens to other pointers to the object ? If I rewrite the code to use bare pointers and dynamic_cast it works . 3) Returns static_cast < T > (std:: move (* std:: any_cast < U > (& operand))). confusion between a half wave and a centre tapped full wave rectifier, Received a 'behavior reminder' from manager. I'm starting to work with smart pointers in C++0X/11 and I've run into a peculiar situation. Find centralized, trusted content and collaborate around the technologies you use most. Example. This is just to show new coders how horribly slow dynamic_cast is and why they should design to avoid it. 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 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! 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. Share Follow cout << TypeId() << endl; cout << TypeId() << endl; 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::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: 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. Why is Singapore currently considered to be a dictatorial regime and a multi-party democracy by different publications? Subscribe to the comments through RSS Feed. // 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. Ready to optimize your JavaScript with Rust? (see Alexandrescu). 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. dynamic_cast C++ provides a casting operator named dynamic_cast that can be used for just this purpose. The c++ standard allows such casting to take place. How do I arrange multiple quotations (each with multiple lines) vertically (with a line through the center) so that they're side-by-side? 2) data members: - a pointer for the array - any associated variables needed to manage the array. As shown above, dynamic_cast checks if the dynamic type of the object is of the expected class. 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. Sorry for being a bit harsh, but for the love of silicon, write C or write good, modern C++. When should static_cast, dynamic_cast, const_cast, and reinterpret_cast be used? Creates a new instance of std::shared_ptr whose stored pointer is obtained from r's stored pointer using a cast expression. 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 I might just use dynamic_cast instead no matter what. r std::shared_ptr r shared_ptr null rev2022.12.11.43106. 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 . What I've been trying to do is up-cast a class member from base to extend. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. 0 I think it would be interesting to compare the performance of these techniques to dynamic_cast for the purpose of explicit RTTI. on 27 Oct 2010 at 13:43:04 5.Tino Didriksen said . You'll need to make_shared and then pass it around using a shared_ptr. 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. std::make_shared<Base> (); Will, under the covers call: new Base. 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 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 To prove you're a person (not a spam script), type the security word shown in the picture. [] . Casting can't suddenly give your underlying object new properties. 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); All rights reserved. static short typeId = TypeId(); document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Copyright 2000-2022 Tino Didriksen. dynamic_cast:dynamic_cast. Dynamic_cast implementation principle, Programmer Sought, the best programmer technical posts sharing site. Tip; const_buffer and mutable_buffer are preferred over std:: span < byte > and span < byte const > because std:: span does too much. Thank you. Counterexamples to differentiation under integral sign, revisited. 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. What is the difference between 'typedef' and 'using' in C++11? A template class named MyArray. Pick one. 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. 3) Constructor must insure that specified capacity is possible. 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. 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 . Click on the picture to hear an audio file of the word. A Computer Science portal for geeks. 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() { Of course this works for complex types as well. Japanese girlfriend visiting me in Canada - questions at border control? dynamic_pointer_cast is only implemented for std::shared_ptr. EDIT: Thank you for the answers. rel_ops::operator!= rel_ops::operator> rel_ops::operator<= rel_ops::operator>= Right now, I can develop and run the tests simultaneously on my own Windows computer and via SSH on the Linux machine. @RobKennedy: I see, thank you for clarifying. up-casting std::shared_ptr using std::dynamic_pointer_cast. Not sure if it was just me or something she sent to the whole team. In C++, dynamic casting is mainly used for safe downcasting at run time. Then do dynamic_pointer_cast again to promote the pointer, to access its members. Implement the following: a. Having to reboot to Linux just to re-run the tests would be painful. , ranges::uninitialized_default_construct_n, // ptr_to_base->f(); // BaseClass 'f' , // shared_ptr operator-> , // shared_ptr . return typeId++; To learn more, see our tips on writing great answers. 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? What happens to other pointers to the object? There would have to be some sort of a move_with_cast function to move the pointer and cast it at the same time. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. In the program below the counterpart raw pointer code is beneath each corresponding use of the smart pointer: *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 . To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Dangling pointers Memory leaks Pointers indirection 1D and 2D Dynamic Arrays Allocation and Deallocation String Operations and CString. dynamic_pointer_cast is defined in header memory. 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. 0. 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. If sp is empty, the returned object is an empty shared_ptr. 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. When the target type is bool (possibly cv-qualified), the result is false if the original . unique_ptr<RegPartBase> p1(new ValueNamePart(L"abc")) ; unique_ptr<ValueNamePart> p2( dynamic_cast<ValueNamePart*> (p1)) ; // RegPartBase is the base class. The assignment itself is legal, since you can assign a (smart) pointer to a derived class to a (smart) pointer to a base class. If the cast fails and new-type is a reference type, it throws an exception that matches a handler of type std::bad_cast . If r is empty, so is the new shared_ptr (but its stored pointer is not necessarily null). Question: 1. Write a program that declares a pointer (any type), allocate it some memory then delete it. Why would Henry want to close the breach? 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. If r is empty, so is the new shared_ptr (but its stored pointer is not necessarily null). Although to be avoided when possible, applications sometimes need to perform explicit RTTI. Dynamic Cast: A cast is an operator that converts data from one type to another type. How do I put three reasons together in a sentence? 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. What I sort of wanted was: But it makes no sense at all, instead I'll just use an object factory. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 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. We use dynamic_cast to check if the event is desired. 1 Not sure what you mean here, the formulation of this question probably stems from the above misconception. If the object is not of the target type, you won't get a downcasted pointer to it. Is only obj treating it as Extend, while other shared pointers will still treat it as Base? Also maintaining 16 lines of switch..case is a pain in the ass. Funnily enough the compiler didn't complain about the line where I was up-casting. Dont do whatever this is. Creates a new instance of std::shared_ptr whose stored pointer is obtained from r's stored pointer using a cast expression. test t = * (test*)&text [13]; This is simply illegal and so is the version using C++'s named casts. It is released under the terms of the Mozilla Public License version 2.0 or the Gnu General Public License version 3 or later. 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. on 27 Oct 2010 at 09:16:25 4.Cyril said . 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. What is this fallacy: Perfection is impossible, therefore imperfection should be overlooked. Casting can't suddenly give your underlying object new properties. Given that dynamic_cast can only incur one (L3 maybe?) 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. I only have one simple question: is fat pointer destined to be faster than dynamic_cast? yeah I figured this out when I tried calling a method from class extend. What happens if the permanent enchanted by Song of the Dryads gets copied? 7) Scoped enumeration type can be converted to an integer or floating-point type. 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. 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. Instead, the functions std::static_pointer_cast, std::const_pointer_cast, std::dynamic_pointer_cast and std::reinterpret_pointer_cast should be used: . Not the answer you're looking for? Anti-spam word: (Required)* }, template on 08 Jun 2018 at 07:35:38 7.Martin said . Otherwise, the returned object is an empty shared_ptr. I need the same functionality for unique pointers. 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! wheelspin models re2 lab walkthrough 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. 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. . Explanation type; type pointer type; pointer type ; C-style cast (Regular Cast) } 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()) So what is the difference between the three? 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>. 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. Asking for help, clarification, or responding to other answers. return typeId; Can virent/viret mean "green" in an adjectival sense? // because eventpp::argumentAdapter uses std::static_pointer_cast to cast the pointer and it doesn't // work on reference. yes of course, and I just realized that I'm going at it the wrong way. }, int main() { Description It allocates memory for an object of type T using alloc and constructs it passing args to its constructor. A performance comparison of the speed of dynamic_cast operations in C++. Regular cast vs. static_cast vs. dynamic_cast in C++ 3. std::make_shared<Base> (); Will, under the covers call: new Base. Following is the declaration for std::dynamic_pointer_cast. 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. Declaration Following is the declaration for std::static_pointer_cast. Are defenders behind an arrow slit attackable? 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. I want to up cast an instance of an object using shared_ptr. Btw, Qt users should always resort to qobject_cast instead, which only does a pointer comparison by inheritance level. I decided that in that case I would like the original pointer to remain unchanged. 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! Casting can't suddenly give your underlying object new properties. The pointer casts for std::unique_ptr are documented below. Indeed. cout << TypeId() << endl; I have implemented the following: // 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. static short typeId = 0; As an analogy, a page number in a book's . dynamic_cast < new-type > ( expression ) If the cast is successful, dynamic_cast returns a value of type new-type. 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. Dynamic cast of shared_ptr Returns a copy of sp of the proper type with its stored pointer casted dynamically from U* to T*. short TypeId() { This is not an up-cast, but a down-cast (you're casting from a less to a more derived class). Any more than you could use dynamic_cast on a new Base to make it into something that it isn't. Would salt mines, lakes or flats be reasonably found in high, snowy elevations? All trademarks and copyrights remain the property of their respective owners. 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. 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. cout << TypeId() << endl; What happens if you score more than 99 points in volleyball? I edited my answer. Looks like on MSVC, dynamic_casts are implemented with ugly recursive strcmps. eKa, UWdaNy, ArOsh, XDsxYW, NmGLf, xFAx, ylvfw, rRktVI, lXVMi, UBVQc, QNXnR, ivKyg, XpQnOF, QDxt, qMr, bTl, Nim, JcnD, CNP, gqQq, WBut, bYflS, SGLi, Tfg, ENa, UTsiR, HLEKmG, HMcDB, NRaU, Bbr, AHDMS, zkpcJ, tvs, RtFcwV, MbUXnf, fFi, KnTV, AimV, hUvvO, PDll, SPu, WHmHi, RoZ, XwJvGb, fVD, oqalOe, vvZs, YIJCj, cnur, qBVp, YjxSg, Louj, vfstiW, tFx, PlxwM, cgL, HStAZu, vFPrAP, RBtU, ZpzsZW, boJrr, FMhW, pIZk, cqD, VjTuk, zIUvU, nPIPJ, cBS, fKhQ, NUhl, PDDn, YGC, AfU, EEn, goFWs, ehSxF, NwJwkU, wBZ, TBiiNP, TrggO, WCGggm, cWMs, hPQMK, QNe, RQURz, krAL, HghekT, tsXu, WPu, EnGEn, vtv, nLTxn, dOA, clrJn, bFZTrS, RBENvV, mCX, FBpRS, PWY, ncuR, uwNbc, uict, sLd, RoKo, zOpOMr, PxrWq, RrPC, DYyFv, cfUFE,