preprocessor

Include guards, as defined here , are used to prevent loading the same code twice at compilation. Why can't my compiler (GCC) detect that it is loading the same code twice and have a sensible default behaviour? Simply because you might have wanted the compiler to load that file twice. Remember, that #include simply loads a file and puts its contents in the place of the directive. This file might be a header file, but may be useful and frequently used piece of source code as well. Most modern compilers react to #pragma once doing exactly what you want them to. Remember though, that this is a

I am making an app that processes sensitive credit card data. If my code is running in debug mode I want to log this data to the console and make some file dumps. However on the final appstore version (ie when it is running in release mode) it is essential all of this is disabled (security hazard)! I will try to answer my question as best I can; so the question becomes 'Is this solution path the right or best way to do it?' // add `IS_DEBUG=1` to your debug build preprocessor settings #if( IS_DEBUG ) #define MYLog(args...) NSLog(args) #else #define MYLog(args...) #endif Damo Check your project

I'm beginning to program in Java and I'm wondering if the equivalent to the C++ #define exists. A quick search of google says that it doesn't, but could anyone tell me if something similar exists in Java? I'm trying to make my code more readable. Instead of myArray[0] I want to be able to write myArray[PROTEINS] for example. Andrzej Doyle No, because there's no precompiler. However, in your case you could achieve the same thing as follows: class MyClass { private static final int PROTEINS = 0; ... MyArray[] foo = new MyArray[PROTEINS]; } The compiler will notice that PROTEINS can never, ever

I'm using an open source library which seems to have lots of preprocessing directives to support many languages other than C. So that I can study what the library is doing I'd like to see the C code that I'm compiling after preprocessing, more like what I'd write. Can gcc (or any other tool commonly available in Linux) read this library but output C code that has the preprocessing converted to whatever and is also readable by a human? mipadi Yes. Pass gcc the -E option. This will output preprocessed source code. tpdi cpp is the preprocessor. Run cpp filename.c to output the preprocessed code,

I am writing my first razor page today, can't figure out how to enter #if debug #else #endif How can i enter preprocessor in razor? Shawn Wildermuth I just created an extension method: public static bool IsDebug(this HtmlHelper htmlHelper) { #if DEBUG return true; #else return false; #endif } Then used it in my views like so: <section id="sidebar"> @Html.Partial("_Connect") @if (!Html.IsDebug()) { @Html.Partial("_Ads") } <hr /> @RenderSection("Sidebar", required: false) </section> Since the helper is compiled with the DEBUG/RELEASE symbol, it works. This is built in to HttpContext : @if