This is a simple demonstration how to use the flags class in your code. Parts removed for demo purposes.

TCA9548A_FlagsDemo.hpp

#pragma once

#include "Flags.hpp"
#include <cstdint>

namespace lr {

class TCA9548A
{
public:
    enum Channel : uint8_t {
        Channel0 = (1<<0),
        Channel1 = (1<<1),
        Channel2 = (1<<2),
        Channel3 = (1<<3),
        Channel4 = (1<<4),
        Channel5 = (1<<5),
        Channel6 = (1<<6),
        Channel7 = (1<<7),
    };
    LR_DECLARE_FLAGS(Channel, Channels);
    
    enum class Status : uint8_t {
        Success,
        Error,
    };

public:
    TCA9548A(/*...*/);

public:
    void initialize();
    Status test();
    void reset();
    Status setChannel(Channel channel);
    Status setChannels(Channels channels);
    Status clearAllChannels();

private:
    // ...
    Channels _enabledChannels;
};

LR_DECLARE_OPERATORS_FOR_FLAGS(TCA9548A::Channels);

}