goto

I basically want to write me a bash script, where I'd generate a couple of big files using heredoc ; and then run some commands using those files. It is understood that (obviously) the heredoc files need to be generated before the commands run - however, what irritates me in that arrangement, is that I must also write the 'heredoc' statements code, before I write the command code. So I thought I'd write the heredoc statements in a function - but still the same problem here: Chapter 24. Functions says: The function definition must precede the first call to it. There is no method of "declaring"

This code leads to undefined behavior: void some_func() { goto undefined; { T x = T(); undefined: } } The constructor is not called. But what about this code? Will the destructor of x be called? I think it will be, but I want to be sure. :) void some_func() { { T x = T(); goto out; } out: } Yes, destructors will be called as expected, the same as if you exited the scope early due to an exception. Standard 6.6/2 (Jump statements): On exit from scope (however accomplished), destructors are called for all constructed objects with automatic storage duration that are declared in that scope, in the

It seems it's possible with C#, but I need that with C++ and preferably cross platform. Basically, I have a switch that sorts stuff on single criteria, and falls back to default processing on everything else. Say: switch(color) { case GREEN: case RED: case BLUE: Paint(); break; case YELLOW: if(AlsoHasCriteriaX) Paint(); else goto default; break; default: Print("Ugly color, no paint.") break; } Not quite but you can do this: switch(color) { case GREEN: case RED: case BLUE: Paint(); break; case YELLOW: if(AlsoHasCriteriaX) { Paint(); break; /* notice break here */ } default: Print("Ugly color,

I want to declare an array of "jumplabels". Then I want to jump to a "jumplabel" in this array. But I have not any idea how to do this. It should look like the following code: function() { "gotolabel" s[3]; s[0] = s0; s[1] = s1; s[2] = s2; s0: .... goto s[v]; s1: .... goto s[v]; s2: .... goto s[v]; } Does anyone have a idea how to perform this? It is possible with GCC feature known as " labels as values ". void *s[3] = {&&s0, &&s1, &&s2}; if (n >= 0 && n <=2) goto *s[n]; s0: ... s1: ... s2: ... It works only with GCC! goto needs a compile-time label. From this example it seems that you are

To start with I'll say that I agree that goto statements are largely made irrelevant by higher level constructs in modern programming languages and shouldn't be used when a suitable substitute is available. I was re-reading an original edition of Steve McConnell's Code Complete recently and had forgotten about his suggestion for a common coding problem. I had read it years ago when I was first getting started and don't think I realized how useful the recipe would be. The coding problem is the following: when executing a loop you often need to execute part of the loop to initialize state and

We have a situation at work where developers working on a legacy (core) system are being pressured into using GOTO statements when adding new features into existing code that is already infected with spaghetti code. Now, I understand there may be arguments for using 'just one little GOTO' instead of spending the time on refactoring to a more maintainable solution. The issue is, this isolated 'just one little GOTO' isn't so isolated. At least once every week or so there is a new 'one little GOTO' to add. This codebase is already a horror to work with due to code dating back to or before 1984