<h1>if Definition(WIN32) ||定義済み(_WIN32) ||定義済み(__WIN32__) ||定義済み(__NT__)</h1><pre class="brush:php;toolbar:false">// Define something for Windows (32-bit and 64-bit)
#ifdef _WIN64
    // Define something unique for Windows (64-bit only)
#else
    // Define something specific for Windows (32-bit only)
#endif

#include <TargetConditionals.h>
#if TARGET_IPHONE_SIMULATOR
    // iOS, tvOS, or watchOS Simulator
#elif TARGET_OS_MACCATALYST
    // Mac's Catalyst (bridging iOS API into Mac)
#elif TARGET_OS_IPHONE
    // iOS, tvOS, or watchOS device
#elif TARGET_OS_MAC
    // Other Apple platforms
#else
    // Error: Unknown Apple platform
#endif

// Handled elsewhere (Android typically conforms to __linux__)

// Linux

// Unix

// POSIX

// Error: Unknown compiler