As of C++17 what you were trying to do is finally possible: if (int a = Func1(), b = Func2(); a && b) { // Do stuff with a and b. } Note the use of ; of instead of , to separate the declaration and the actual condition.
It’s because you’re actually saying: c = 10; b = c; let a = b; And not what you think you are saying, which is: let a = 10; let b = 10; let c = 10; You’ll notice that no matter how many variables you add to your chain, it will only be the … Read more
Stack space for local variables is usually allocated in function scope. So no stack pointer adjustment happens inside the loop, just assigning 4 to var. Therefore these two snippets have the same overhead.
There is no shorthand in VBA unfortunately, The closest you will get is a purely visual thing using the : continuation character if you want it on one line for readability; Dim clientToTest As String: clientToTest = clientsToTest(i) Dim clientString As Variant: clientString = Split(clientToTest) Hint (summary of other answers/comments): Works with objects too (Excel … Read more
Why not just do this: var = None Python is dynamic, so you don’t need to declare things; they exist automatically in the first scope where they’re assigned. So, all you need is a regular old assignment statement as above. This is nice, because you’ll never end up with an uninitialized variable. But be careful … Read more
This is excellent practice. By creating variables inside loops, you ensure their scope is restricted to inside the loop. It cannot be referenced nor called outside of the loop. This way: If the name of the variable is a bit “generic” (like “i”), there is no risk to mix it with another variable of same … Read more
int* arr[8]; // An array of int pointers. int (*arr)[8]; // A pointer to an array of integers The third one is same as the first. The general rule is operator precedence. It can get even much more complex as function pointers come into the picture.
This comes in useful when you have global variables. You declare the existence of global variables in a header, so that each source file that includes the header knows about it, but you only need to “define” it once in one of your source files. To clarify, using extern int x; tells the compiler that … Read more
The delete operator removes a property from an object. It cannot remove a variable. So the answer to the question depends on how the global variable or property is defined. (1) If it is created with var, it cannot be deleted. For example: var g_a = 1; //create with var, g_a is a variable delete … Read more