For break and continue, the additional label lets you specify which loop you would like to refer to. For example, you may want to break/continue the outer loop instead of the one that you nested in. Here is an example from the Go Documentation: RowLoop: for y, row := range rows { for x, data … Read more
Reflector is not perfect. The actual code of this method is available from the Reference Source. It is located in ndp\fx\src\xsp\system\web\security\admembershipprovider.cs: if( passwordStrengthRegularExpression != null ) { passwordStrengthRegularExpression = passwordStrengthRegularExpression.Trim(); if( passwordStrengthRegularExpression.Length != 0 ) { try { Regex regex = new Regex( passwordStrengthRegularExpression ); } catch( ArgumentException e ) { throw new ProviderException( e.Message, … Read more
Goto can’t skip over initializations of variables, because the respective objects would not exist after the jump, since lifetime of object with non-trivial initialization starts when that initialization is executed: C++11 §3.8/1: […] The lifetime of an object of type T begins when: storage with the proper alignment and size for type T is obtained, … Read more
The (imo) best non-goto version would look something like this: void calculateStuff() { // Please use better names than this. doSomeStuff(); doLoopyStuff(); doMoreStuff(); } void doLoopyStuff() { for (i = 0; i < N; ++i) { for (j = 0; j < N; j++) { for (k = 0; k < N; ++k) { /* … Read more
As already pointed out by all the answers goto – a reserved word in Java and is not used in the language. restart: is called an identifier followed by a colon. Here are a few things you need to take care of if you wish to achieve similar behavior – outer: // Should be placed … Read more
You can use until to make the loop end. You should give it at the end of the loop. This is useful if you do not need to step in to iterate a loop.
Warning: This answer pertains to C++ only; the rules are quite different in C. Won’t x be leaked? No, absolutely not. It is a myth that goto is some low-level construct that allows you to override C++’s built-in scoping mechanisms. (If anything, it’s longjmp that may be prone to this.) Consider the following mechanics that … Read more
Ahmed’s answer is good, but there’s also: switch(color) case YELLOW: if(AlsoHasCriteriaX) case GREEN: case RED: case BLUE: Paint(); else default: Print(“Ugly color, no paint.”); people tend to forget how powerful switches are
They are equivalent, even if you turn the optimizer off. Example: #include <stdio.h> extern void f(void) { while(1) { putchar(‘ ‘); } } extern void g(void) { for(;;){ putchar(‘ ‘); } } extern void h(void) { z: putchar(‘ ‘); goto z; } Compile with gcc -O0 gives equivalent assembly for all 3 functions: f: ; … Read more
First of all, the rule about goto not being allowed to skip over a nontrivial initialization is a compile-time rule. If a program contains such a goto, the compiler is required to issue a diagnostic. Now we turn to the question of whether if constexpr can “delete” the offending goto statement and thereby erase the … Read more