How does the standard library implement std::swap?
2014年8月13日 · If there's an efficient X::swap(X&) member then specializing swap(X&, X&) to call it makes sense. Some move operations might even be implemented in terms of the swap …
c++ - What is the copy-and-swap idiom? - Stack Overflow
The copy-and-swap idiom is a way to do just that: It first calls a class' copy constructor to create a temporary object, then swaps its data with the temporary's, and then lets the temporary's …
stl - C++ builtin to swap two numerical values? - Stack Overflow
2013年4月23日 · Does C++ have a built in such as part of STL to swap two numerical values instead of doing: int tmp = var1; var1 = var2; var2 = tmp; Something like this: …
C++ trying to swap values in a vector - Stack Overflow
2011年6月3日 · Using std::swap by including the <algorithm> library to swap values by references / smart pointers, e.g. std::swap(v[0], v[1]) Note: v[i] is a reference. Using std::iter_swap from …
Why do some people use swap for move assignments?
2015年11月24日 · The default-construct + swap implementation may appear slower, but -sometimes- data flow analysis in the compiler can eliminate some pointless assignments and …
std::swap vs std::exchange vs swap operator - Stack Overflow
2015年5月11日 · The meeting minutes acknowledge "annoying ADL problems" with std::swap(x, y), but conclude that a swap operator would not address those problems. Because of …
c++ - How to implement swap ()? - Stack Overflow
2012年7月24日 · Free function in the same namespace allows for ADL to find it, and enables other code to use the common pattern of void swap( other& l, other& r ) { using std::swap; …
c++ - Benefits of a swap function? - Stack Overflow
2010年7月10日 · The reason an STL friendly class needs swap is that swap is used as a primitive operation in many STL algorithms. (e.g. reverse, sort, partition etc. are typically implemented …
c++ - How to overload std::swap () - Stack Overflow
std::swap() is used by many std containers (such as std::list and std::vector) during sorting and even assignment. But the std implementation of swap() is very generalized and rather …
Is there an elegant way to swap references in C++?
2014年9月17日 · That's a nice example, thanks. It appears that the standards community have realized the need to swap references and added a workaround to C++11 contrary to the …