os.h

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#pragma once
 
#include <cstddef>
#include <filesystem>
 
// Defined on Windows x64 & x86
#if defined(_WIN32)
 
    #define PH_OPERATING_SYSTEM_IS_WINDOWS 1
 
// Defined on Linux
#elif defined(__linux__)
 
    #define PH_OPERATING_SYSTEM_IS_LINUX 1
 
// Defined on Apple platforms
// Reference: https://stackoverflow.com/questions/12132933/preprocessor-macro-for-os-x-targets
#elif defined(__APPLE__) || defined(__MACH__)
 
    #include <TargetConditionals.h>
 
    #if TARGET_OS_MAC == 1 && TARGET_OS_OSX == 1
        #define PH_OPERATING_SYSTEM_IS_OSX 1
    #else
        #error "Unsupported Apple operating system."
    #endif
 
#else
 
    #error "Unsupported operating system."
 
#endif
 
#ifndef PH_OPERATING_SYSTEM_IS_WINDOWS
    #define PH_OPERATING_SYSTEM_IS_WINDOWS 0
#endif
 
#ifndef PH_OPERATING_SYSTEM_IS_LINUX
    #define PH_OPERATING_SYSTEM_IS_LINUX 0
#endif
 
#ifndef PH_OPERATING_SYSTEM_IS_OSX
    #define PH_OPERATING_SYSTEM_IS_OSX 0
#endif
 
namespace ph::os
{
 
enum class EWindowsVersion
{
    Unknown = 0,
 
    // Later version must have larger value
 
    Windows_2000,
    Windows_XP,
    Windows_Vista,
    Windows_7,
    Windows_8,
    Windows_8_1,
    Windows_10
};
 
EWindowsVersion get_windows_version();
 
std::size_t get_L1_cache_line_size_in_bytes();
 
std::filesystem::path get_executable_path();
 
}// end namespace ph::os