subopts.hpp

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// Copyright Takatoshi Kondo 2015
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
 
#if !defined(ASYNC_MQTT_PACKET_SUBOPTS_HPP)
#define ASYNC_MQTT_PACKET_SUBOPTS_HPP
 
#include <cstdint>
#include <ostream>
 
#include <async_mqtt/packet/qos.hpp>
 
 
namespace async_mqtt {
 
namespace sub {
 
enum class retain_handling : std::uint8_t
{
    send = 0b00000000,                       
    send_only_new_subscription = 0b00010000, 
    not_send = 0b00100000,                   
};
 
enum class rap : std::uint8_t
{
    dont = 0b00000000,   
    retain = 0b00001000, 
};
 
enum class nl : std::uint8_t
{
    no = 0b00000000,  
    yes = 0b00000100, 
};
 
struct opts final {
    constexpr opts() = delete;
    ~opts() = default;
    constexpr opts(opts &&) = default;
    constexpr opts(opts const&) = default;
    constexpr opts& operator=(opts &&) = default;
    constexpr opts& operator=(opts const&) = default;
 
    explicit constexpr opts(std::uint8_t value) : data_(value) { }
 
    constexpr opts(retain_handling value) : data_(static_cast<std::uint8_t>(value)) { }
 
    constexpr opts(rap value)             : data_(static_cast<std::uint8_t>(value)) { }
 
    constexpr opts(nl value)              : data_(static_cast<std::uint8_t>(value)) { }
 
    constexpr opts(qos value)             : data_(static_cast<std::uint8_t>(value)) { }
 
    constexpr opts operator|(opts rhs) const { return opts(data_ | rhs.data_); }
    constexpr opts operator|(retain_handling rhs) const   { return *this | opts(rhs); }
    constexpr opts operator|(rap rhs) const               { return *this | opts(rhs); }
    constexpr opts operator|(nl rhs) const                { return *this | opts(rhs); }
    constexpr opts operator|(qos rhs) const               { return *this | opts(rhs); }
 
    constexpr opts& operator|=(opts rhs) { return (*this = (*this | rhs)); }
    constexpr opts& operator|=(retain_handling rhs)   { return (*this = (*this | rhs)); }
    constexpr opts& operator|=(rap rhs)               { return (*this = (*this | rhs)); }
    constexpr opts& operator|=(nl rhs)                { return (*this = (*this | rhs)); }
    constexpr opts& operator|=(qos rhs)               { return (*this = (*this | rhs)); }
 
    constexpr retain_handling get_retain_handling() const
    { return static_cast<enum retain_handling>(data_ & 0b00110000); }
 
    constexpr rap get_rap() const
    { return static_cast<enum rap>(data_ & 0b00001000); }
 
    constexpr nl get_nl() const
    { return static_cast<enum nl>(data_ & 0b00000100); }
 
    constexpr qos get_qos() const
    { return static_cast<enum qos>(data_ & 0b00000011); }
 
    explicit constexpr operator std::uint8_t() const { return data_; }
 
    constexpr bool operator==(opts rhs) const { return data_ == rhs.data_; }
 
    constexpr bool operator<(opts rhs) const { return data_ < rhs.data_; }
 
private:
    std::uint8_t data_;
};
 
constexpr opts operator|(retain_handling lhs, rap rhs) { return opts(lhs) | rhs; }
constexpr opts operator|(retain_handling lhs, nl rhs)  { return opts(lhs) | rhs; }
constexpr opts operator|(retain_handling lhs, qos rhs) { return opts(lhs) | rhs; }
 
constexpr opts operator|(rap lhs, retain_handling rhs) { return opts(lhs) | rhs; }
constexpr opts operator|(rap lhs, nl rhs)              { return opts(lhs) | rhs; }
constexpr opts operator|(rap lhs, qos rhs)             { return opts(lhs) | rhs; }
 
constexpr opts operator|(nl lhs, retain_handling rhs)  { return opts(lhs) | rhs; }
constexpr opts operator|(nl lhs, rap rhs)              { return opts(lhs) | rhs; }
constexpr opts operator|(nl lhs, qos rhs)              { return opts(lhs) | rhs; }
 
constexpr opts operator|(qos lhs, retain_handling rhs) { return opts(lhs) | rhs; }
constexpr opts operator|(qos lhs, rap rhs)             { return opts(lhs) | rhs; }
constexpr opts operator|(qos lhs, nl rhs)              { return opts(lhs) | rhs; }
 
constexpr char const* retain_handling_to_str(retain_handling v) {
    switch(v) {
    case retain_handling::send:                       return "send";
    case retain_handling::send_only_new_subscription: return "send_only_new_subscription";
    case retain_handling::not_send:                   return "not_send";
    default:                                          return "invalid_retain_handling";
    }
}
 
inline
std::ostream& operator<<(std::ostream& os, retain_handling val)
{
    os << retain_handling_to_str(val);
    return os;
}
 
constexpr char const* rap_to_str(rap v) {
    switch(v) {
    case rap::dont:   return "dont";
    case rap::retain: return "retain";
    default:          return "invalid_rap";
    }
}
 
inline
std::ostream& operator<<(std::ostream& os, rap val)
{
    os << rap_to_str(val);
    return os;
}
 
constexpr char const* nl_to_str(nl v) {
    switch(v) {
    case nl::no:   return "no";
    case nl::yes:  return "yes";
    default:       return "invalid_nl";
    }
}
 
inline
std::ostream& operator<<(std::ostream& os, nl val)
{
    os << nl_to_str(val);
    return os;
}
 
} // namespace sub
 
} // namespace async_mqtt
 
#endif // ASYNC_MQTT_PACKET_SUBOPTS_HPP