Using #ifdef for Platform-Specific Code

You can use #ifdef along with platform-specific macros to conditionally compile code for different platforms. Here's an example:

1#include <iostream>
2
3#ifdef _WIN32  
4#include <windows.h>
5void PlatformSpecificFunction() {
6  // Windows-specific code
7  std::cout << "Running on Windows\n";
8}
9
10#elif defined(__APPLE__)  
11#include <CoreFoundation/CoreFoundation.h>
12void PlatformSpecificFunction() {
13  // macOS-specific code
14  std::cout << "Running on macOS\n";
15}
16
17#elif defined(__linux__)  
18#include <unistd.h>
19void PlatformSpecificFunction() {
20  // Linux-specific code
21  std::cout << "Running on Linux\n";
22}
23
24#else
25#error "Unsupported platform"
26#endif
27
28int main() {
29  PlatformSpecificFunction();
30}

1Running on Windows

In this example:

• #ifdef _WIN32 checks if the code is being compiled for Windows.
• #elif defined(__APPLE__) checks if the code is being compiled for macOS.
• #elif defined(__linux__) checks if the code is being compiled for Linux.
• #else block handles unsupported platforms and raises a compilation error with #error.

By using platform-specific macros and #ifdef, you can include platform-specific headers, define platform-specific functions, and write code tailored for different operating systems.

Note: The exact macros and headers used may vary depending on the compiler and platform. Consult your compiler's documentation for the appropriate macros to use.