Description In the C Programming Language, the #ifdef directive allows for conditional compilation. The preprocessor determines if the provided macro exists before including the subsequent code in the compilation process. Syntax The syntax for the #ifdef directive in the C language is: #ifdefmacro_de...
ifdef __linux__ #ifdef __linux__ is a preprocessor directive used in C and C++ programming languages to check if the code is being compiled on a Linux operating system. This directive allows developers to write platform-specific code that will only be included in the final executable when i...
You can use the #ifdef and #ifndef directives anywhere that the#ifcan be used. The #ifdef statement is equivalent to ) directive. These directives check only for the presence or absence of identifiers defined using the#definedirective, not for identifiers declared in the C or C++ source code...
In the programming language C every non-zero value is taken to mean true when interpreted as a boolean. If we wanted to have these semantics for the Makefile-based builds, a proper check would look like this in pseudo code: if not defined NO_FOO or NO_FOO=0; then enable foo; fi if...
Here’s a quick photo of when I was remoting in from my truck, using my Surface Pro 8. One reason I like to use my Surface for this, is that I can charge it using USB-C in my truck or the field battery when I’m out imaging. ...
(thing) by d_goddard Sun Sep 24 2000 at 3:41:44 A preprocessor option used in the C programming language, allowing for conditional compiling. Use of #ifdef is generally acnowledged by programmers as being powerful, necessary, and ugly....
These directives check only for the presence or absence of identifiers defined using the #define directive, not for identifiers declared in the C or C++ source code. These directives are provided only for compatibility with previous versions of the language. The use of the defined operator with ...
Here’s a quick photo of when I was remoting in from my truck, using my Surface Pro 8. One reason I like to use my Surface for this, is that I can charge it using USB-C in my truck or the field battery when I’m out imaging. ...