attribute.hpp

#pragma once
 
#include "terminalpp/colour.hpp"
#include "terminalpp/effect.hpp"
 
#include <boost/container_hash/hash.hpp>
 
#include <iosfwd>
 
namespace terminalpp {
 
//* =========================================================================
//* =========================================================================
struct TERMINALPP_EXPORT attribute
{
    //* =====================================================================
    //* =====================================================================
    constexpr attribute(  // NOLINT
        colour foreground_colour = colour(),
        colour background_colour = colour(),
        intensity intensity_effect = graphics::intensity::normal,
        underlining underlining_effect = graphics::underlining::not_underlined,
        polarity polarity_effect = graphics::polarity::positive,
        blinking blink_effect = graphics::blinking::steady) noexcept
      : foreground_colour_(foreground_colour),
        background_colour_(background_colour),
        intensity_(intensity_effect),
        underlining_(underlining_effect),
        polarity_(polarity_effect),
        blinking_(blink_effect)
    {
    }
 
    //* =====================================================================
    //* =====================================================================
    [[nodiscard]] friend std::size_t hash_value(attribute const &attr) noexcept
    {
        std::size_t seed = 0;
        boost::hash_combine(seed, attr.foreground_colour_);
        boost::hash_combine(seed, attr.background_colour_);
        boost::hash_combine(seed, attr.intensity_);
        boost::hash_combine(seed, attr.underlining_);
        boost::hash_combine(seed, attr.polarity_);
        boost::hash_combine(seed, attr.blinking_);
 
        return seed;
    }
 
    //* =====================================================================
    //* =====================================================================
    [[nodiscard]] constexpr friend auto operator<=>(
        attribute const &lhs, attribute const &rhs) noexcept = default;
 
    // Graphics Attributes
    colour foreground_colour_;
    colour background_colour_;
    intensity intensity_;
    underlining underlining_;
    polarity polarity_;
    blinking blinking_;
};
 
//* =========================================================================
//* =========================================================================
TERMINALPP_EXPORT
std::ostream &operator<<(std::ostream &out, attribute const &attr);
 
}  // namespace terminalpp
 
namespace std {
 
template <>
struct hash<terminalpp::attribute>
{
    using argument_type = terminalpp::attribute;
    using result_type = std::size_t;
 
    [[nodiscard]] result_type operator()(
        argument_type const &attr) const noexcept
    {
        return hash_value(attr);
    }
};
 
}  // namespace std