ALMOST_ALWAYS/ALMOST_NEVER

// ALMOST_ALWAYS/ALMOST_NEVER (likely/unlikely early support)
#ifdef __has_cpp_attribute
    #if __has_cpp_attribute(likely)
        #define ALMOST_ALWAYS(expr) (expr) [[likely]]
    #endif
    #if __has_cpp_attribute(unlikely)
        #define ALMOST_NEVER(expr) (expr) [[unlikely]]
    #endif
#endif
#ifndef ALMOST_ALWAYS
    #if defined(__builtin_expect)
        #define ALMOST_ALWAYS(expr) (__builtin_expect(static_cast<bool>(expr), 1))
    #else
        #define ALMOST_ALWAYS(expr) (expr)
    #endif
#endif
#ifndef ALMOST_NEVER
    #if defined(__builtin_expect)
        #define ALMOST_NEVER(expr) (__builtin_expect(static_cast<bool>(expr), 0))
    #else
        #define ALMOST_NEVER(expr) (expr)
    #endif
#endif