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
{
    //* =====================================================================
    //* =====================================================================
    [[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