Search DaniWeb - copy-and-swap

How do I swap out the mesh on a humanoid armature in Unity 3D? 6 Days Ago by Michael_80 … 3D, utilizing the Starter Assets package, I am trying to swap the mesh on the Starter Asset character that I duplicated… skeleton, weighted and has a root. I was hoping to copy and paste until I was proven wrong. Re: Copy constructor problemm..Help 12 Years Ago by mike_2000_17 … is to take a copy (i.e. by value) and then swap (hence, the name copy-and-swap). And also, you…i.e. makes a copy) { using std::swap; //import std-scoped swap function overloads. swap(p,t.p); //swap the pointer in t …"new char[]" allocation and copy procedure when you implement the copy-and-swap idiom instead. 4) Printing a C-… Re: Copy constructor confusion 11 Years Ago by mike_2000_17 … operator? Because they do different things. The copy-constructor creates an object by duplicating the content … case you usually implement the copy-assignment operator using the [copy-and-swap idiom](http://en.wikibooks.org/wiki…/More_C++_Idioms/Copy-and-swap). For the other … Re: Copy constructor problemm..Help 12 Years Ago by mike_2000_17 … a special allowance for compilers to optimize away the copy constructor when returning an object by value from a function… useless copying. Never depend on the fact that the copy-constructor will be called once or twice during a return… and direct assignment at the call-site. BTW, the copy-constructor should take a const reference. You also need an… How to forcefully invoke a copy con/assignment op. 11 Years Ago by triumphost …'s just a class I created specifically for learning Copy/Move/Swap semantics but I never know if I'll need it…) //Pass by value. { std::cout<<"Copy Assignment Called.\n" Bmp.Swap(*this); return *this; } Bitmaps& Bitmaps::operator… Re: How to forcefully invoke a copy con/assignment op. 11 Years Ago by mike_2000_17 …didn't implement copy con or move con and the compiler generated it, would I still use copy/swap idiom? The… compiler will also generate the copy- and move-assignment operators for … I should not (should not have to) implement copy-swap or copy/move constructors for POD types and vector based classes… Re: How to forcefully invoke a copy con/assignment op. 11 Years Ago by mike_2000_17 … (rvalue). And, by the way, if you have a copy-and-swap assignment operator which passes the object by value (which is… separate move-assignment operator because the copy-and-swap will also act as a move-and-swap if the passed value-object is… Beginning C++0x: Making a RAII Class 12 Years Ago by mike_2000_17 …=(const int_vector& aV) { if(this != &aV) { //copy: int_vector tmp(aV); //swap: swap(*this,tmp); }; // tmp will be destroyed here and clear…;< v2.size() << std::endl; v1 = v; //copy-assignment. (copy-and-swap) std::cout << "v1.size = " <… Re: Does vector's copy constructor performs a deep copy? 13 Years Ago by mike_2000_17 Your problem is a nice situation in which the copy-and-swap idiom is very applicable: [CODE] class B { std::vector<… B& cpy) { B temp(cpy); //copy the cpy object into temp return swap(temp); //swap this and temp. And temp will automatically… Re: Deep copy problem 12 Years Ago by mike_2000_17 ….numberHouses); swap(lhs.ListHouses,rhs.ListHouses); }; //A copy-and-swap assignment operator: Street& operator=(Street rhs) { //pass-by-value (copy) swap(*this,rhs); //swap return… Re: Does vector's copy constructor performs a deep copy? 13 Years Ago by mike_2000_17 Yes, your implementation of the deep-copy constructor seems totally fine (as long as the objects a…://en.wikibooks.org/wiki/More_C%2B%2B_Idioms/Copy-and-swap"]copy-and-swap[/URL]" or "copy-and-move"(C++0x) is… way to efficiently implement the assignment in terms of the copy-constructor. Or, you can just rewrite the same code again… Re: Scope-guarded lockable objects in C++11 11 Years Ago by mike_2000_17 …l2(rhs.mut); using std::swap; swap(lhs.value, rhs.value); }; // Copy-and-swap (and, implicitly, move-and-swap): lockable<T>&…; operator=(lockable<T> rhs) { swap(*this, rhs… Re: Delay Constructor Call to Parent Class 11 Years Ago by mike_2000_17 … an assignment operator (and what goes with it, copy-constructor, swap-op, etc.) because this kind of operation implies …++11. On a technical note, your implementation of the Button copy-assignment operator: Button& Button::operator = (Button B)…one (e.g., the usual pass-by-value copy-and-swap idiom doesn't work). This is why resource-… Re: Problem with delete in destructor 12 Years Ago by mike_2000_17 …are not doing a deep copy of your object. Your assignment operator performs a shallow copy (copy only the pointer, you …don't copy the memory it points to). I … RAII[/URL]. Your copy-constructor is also wrong, I highly recommend that you use a copy-and-swap idiom, like I … Re: Use of pointers to hierarchical data structures in C++ 13 Years Ago by mike_2000_17 … operator=(const Collection& C) { Collection tmp(C); //copy to temporary. swap(tmp); //swap with the temporary. return *this; //leave the old data… operator=(const Collection& C) { Collection tmp(C); //copy to temporary. swap(tmp); //swap with the temporary. return *this; //leave the old data… Re: revers of stack problem 10 Years Ago by mike_2000_17 … need to do a complete element-by-element copy: void Stack::Swap(Stack& rhs) { // swap the top pointer: intnode* p_tmp = rhs.top… assignment operator](http://en.wikibooks.org/wiki/More_C%2B%2B_Idioms/Copy-and-swap), and more importantly, how to re-implement your reversing… Re: Good text for understanding good ways to handle errors? 13 Years Ago by mike_2000_17 …;http://stackoverflow.com/questions/3279543/what-is-the-copy-and-swap-idiom"]Copy-and-swap[/URL], [URL="http://en.wikibooks.org/wiki…/More_C%2B%2B_Idioms/Non-throwing_swap"]Non-throwing swap[/URL… Re: Problem with stack::Top() 13 Years Ago by flowerzink [QUOTE=mike_2000_17;1526694]Where is the copy-constructor in your Mascota class? That's the piece missing…="http://en.wikibooks.org/wiki/More_C%2B%2B_Idioms/Copy-and-swap"]copy-and-swap[/URL] idiom. Finally, your Set() function does …Wow, thanks a lot!! I think the problem was the copy-constructor. I have to keep the pointers you see, my… Re: Problem with stack::Top() 13 Years Ago by mike_2000_17 Where is the copy-constructor in your Mascota class? That's the piece missing, …="http://en.wikibooks.org/wiki/More_C%2B%2B_Idioms/Copy-and-swap"]copy-and-swap[/URL] idiom. Finally, your Set() function does not… Re: overloading assignment operator 9 Years Ago by mike_2000_17 … We don't appreciate it much when people simply copy-paste their assignment questions to this forum. You are…[here](http://stackoverflow.com/questions/3279543/what-is-the-copy-and-swap-idiom), [here](http://progdoo.wordpress.com/2012/06…/03/c11-copy-and-swap-idiom/) and [here](http://www.daniweb.com/software… Re: this pointer 15 Years Ago by vijayan121 … address of the ThreeD sub-object. the 'make temporary copy and swap' technique does not work at all in class hierarchies when… an exception-safe assignment operator without creating a > temporary copy - of either the object itself, or (at a minimum) of…-safe assignment operator can be written without creating a temporary copy of the strings. Re: assignment operator overlaoding in context of different objects 9 Years Ago by NathanOliver When doing operations like this you should look at using the [copy and swap idiom](http://stackoverflow.com/a/3279550/4342498). Re: Arrays in visual basic 13 Years Ago by WaltP Copy the text boxes into an array. Sort. Write the array back into the Text boxes. Re: Scope-guarded lockable objects in C++11 11 Years Ago by Rashakil Fol `swap(lockable<T>&, lockable<T>&)` is broken. It doesn't work properly when lhs and rhs are the same object. It tries to lock the `mut` field twice, but `std::mutex` is not recursively lockable. Re: generate different random numbers does not identical to each other 12 Years Ago by ddanbe Copy the following letter by letter. It contains the code by … dealing with integers, we can use the xor-no-temp swap vett[i] ^= vett[j]; vett[j] ^= vett[i]; vett[i… Re: std::vector fast copy routine 13 Years Ago by Narue …, some say [code=c++]vector.swap ( otherVector );[/code] is fastest? [/quote] Typically, but that's not a copy operation. [QUOTE]Let me…'s often better to think squiggly. Instead of making a copy, can get you get away with straight aliasing? You might… std::vector fast copy routine 13 Years Ago by harryhaaren … my code, talking about 88200+ floats per vector. I wanna copy the contents of one into the other. I've read… around, some say [code=c++]vector.swap ( otherVector );[/code] is fastest? Currently I'm using the following… Re: std::vector fast copy routine 13 Years Ago by Fbody What about the vector class' built-in copy constructor? I don't know exactly how it works, but … the the dataType stored in the vector have a proper copy constructor defined (which a float should). That's some massive… Re: std::vector fast copy routine 13 Years Ago by daviddoria Check out the insert() and copy() function. There are examples here: [url]http://programmingexamples.net/index.php?title=CPP/STL/Vector[/url] David Re: std::vector fast copy routine 13 Years Ago by arkoenig … two copies, so you're doing something different to one copy than you are to the other. Are you sure that…