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    • ๐Ÿ›ฃ๏ธC Plus Plus: Docs
  • Build
    • ๐Ÿ”ฅBuild Process
    • ๐Ÿ”งConnect multiple C++ Files
  • Code
    • โฎ๏ธPre-Processors
      • #include
      • #define
      • #ifdef
      • #pragma
      • Predefined Macros
    • LValue and RValue
    • ๐Ÿช…Data Types
      • Enum
      • TypeDef
      • const in c++
      • extern vs inline
    • ๐ŸŽญCasting
    • ๐Ÿ”ƒOperator overloading
      • Available Operators
      • Examples of operator overloading
    • ๐Ÿ—บ๏ธNamespace
      • Namespace Example
      • Using directive
    • ๐Ÿ•ต๏ธHeader File
      • For C++ Classes
    • ๐Ÿ—๏ธStructure
      • Struct vs Class
      • Public vs Private inheritance
    • ๐ŸขClasses
      • Friend Function
      • Copy Constructor
      • Explicit Constructor
      • Move Constructor
        • Move Semantics
      • Other constructors
      • Virtual functions
      • Pure virtual function
      • Other function declaration
      • const function vs final function
  • Memory
    • ๐Ÿง Memory Introduction
    • โœจHeap and Stack
    • ๐ŸŽฏPointers
      • Dangling Pointer
      • 'this' Pointer
      • Function Pointer
      • Smart Pointers
        • Unique Pointer
        • Shared Pointer
        • Weak Pointer
      • Reference count
    • ๐Ÿ‘จโ€๐ŸญHelper function
    • ๐ŸกVector [ArrayList]
      • Custom vector, part 1
      • Custom vector, part 2
      • Custom vector, part 3
      • std::vector
    • โ™ป๏ธUnion
      • Type Punning
      • Type Punning, part 2
      • Type Punning, part 3
      • Union, part 1
      • Union, Part 2
  • Thread
    • ๐ŸงตThreading
      • std::thread
      • Detach a thread
  • Misc
    • ๐Ÿ—‚๏ธExecution Order
    • ๐Ÿง Print memory
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  1. Code

Pre-Processors

Those #Tag inside our program

Preprocessors in C++ are directives that are processed before the actual compilation of your code begins. They allow you to perform certain operations on your source code before it's compiled. Here's a concise overview of preprocessors in C++:

  1. Inclusion of header files:

    #include <iostream>  // For standard library headers
    #include "myheader.h"  // For your own headers
  2. Macro definitions:

    #define PI 3.14159
    #define SQUARE(x) ((x) * (x))
  3. Conditional compilation:

    #ifdef DEBUG
      // Debug code
    #endif
  4. File inclusion guards:

    #ifndef MYHEADER_H
    #define MYHEADER_H
    // Header content
    #endif
  5. Pragma directives:

    #pragma once

These directives help with code organization, portability, and can sometimes improve performance.

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Last updated 9 months ago

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