is the proper use of swap. Write it this way when you write “library” code and want to enable ADL (argument-dependent lookup) on swap. Also, this has nothing to do with SFINAE. // some algorithm in your code template<class T> void foo(T& lhs, T& rhs) { using std::swap; // enable ‘std::swap’ to be found // … Read more
C# 7 introduced tuples which enables swapping two variables without a temporary one: int a = 10; int b = 2; (a, b) = (b, a); This assigns b to a and a to b.
Assuming what you need is a simple byte swap, try something like Unsigned 16 bit conversion: swapped = (num>>8) | (num<<8); Unsigned 32-bit conversion: swapped = ((num>>24)&0xff) | // move byte 3 to byte 0 ((num<<8)&0xff0000) | // move byte 1 to byte 2 ((num>>8)&0xff00) | // move byte 2 to byte 1 ((num<<24)&0xff000000); // … Read more
17.6.5.15 [lib.types.movedfrom] Objects of types defined in the C++ standard library may be moved from (12.8). Move operations may be explicitly specified or implicitly generated. Unless otherwise specified, such moved-from objects shall be placed in a valid but unspecified state. When an object is in an unspecified state, you can perform any operation on the … Read more
From python.org Assignment of an object to a target list, optionally enclosed in parentheses or square brackets, is recursively defined as follows. … Else: The object must be an iterable with the same number of items as there are targets in the target list, and the items are assigned, from left to right, to the … Read more
Here’s an interesting way to solve this using only jQuery (if the 2 elements are next to each other): $(“#element1”).before($(“#element2”)); or $(“#element1”).after($(“#element2”));
Here’s a one-liner to swap the values of two variables. Given variables a and b: b = [a, a = b][0]; Demonstration below: var a=1, b=2, output=document.getElementById(‘output’); output.innerHTML=”<p>Original: “+a+”, “+b+”</p>”; // swap values for variables “a” and “b” b = [a, a = b][0]; output.innerHTML+=”<p>Swapped: “+a+”, “+b+”</p>”; <div id=”output”></div>
The best script I found is on this page : http://northernmost.org/blog/find-out-what-is-using-your-swap/ Here’s one variant of the script and no root needed: #!/bin/bash # Get current swap usage for all running processes # Erik Ljungstrom 27/05/2011 # Modified by Mikko Rantalainen 2012-08-09 # Pipe the output to “sort -nk3” to get sorted output # Modified by … Read more
Python evaluates expressions from left to right. Notice that while evaluating an assignment, the right-hand side is evaluated before the left-hand side. Python docs: Evaluation order That means the following for the expression a,b = b,a : The right-hand side b,a is evaluated, that is to say, a tuple of two elements is created in … Read more