Tag.h

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// SPDX-License-Identifier: LGPL-2.1-or-later
 
#ifndef TASKOLIB_TAG_H_
#define TASKOLIB_TAG_H_
 
#include <iosfwd>
#include <string_view>
#include <string>
 
namespace task {
 
class Tag
{
public:
    static constexpr std::size_t max_length = 32;
 
    static const std::string_view valid_characters;
 
 
    Tag() : name_{ "-" }
    {}
 
    explicit Tag(std::string_view name);
 
    friend bool operator==(const Tag& a, const Tag& b)
    {
        return a.name_ == b.name_;
    }
 
    friend bool operator!=(const Tag& a, const Tag& b)
    {
        return a.name_ != b.name_;
    }
 
    friend bool operator<(const Tag& a, const Tag& b)
    {
        return a.name_ < b.name_;
    }
 
    friend bool operator<=(const Tag& a, const Tag& b)
    {
        return a.name_ <= b.name_;
    }
 
    friend bool operator>(const Tag& a, const Tag& b)
    {
        return a.name_ > b.name_;
    }
 
    friend bool operator>=(const Tag& a, const Tag& b)
    {
        return a.name_ >= b.name_;
    }
 
    friend std::string operator+(const std::string& lhs, const Tag& rhs)
    {
        return lhs + rhs.name_;
    }
 
    friend std::string operator+(const Tag& lhs, const std::string& rhs)
    {
        return lhs.name_ + rhs;
    }
 
    friend std::string& operator+=(std::string& lhs, const Tag& rhs)
    {
        lhs += rhs.name_;
        return lhs;
    }
 
    friend std::ostream& operator<<(std::ostream& stream, const Tag& tag);
 
    std::size_t size() const noexcept { return name_.size(); }
 
    const std::string& string() const noexcept { return name_; }
 
private:
    std::string name_;
 
    static std::string_view check_validity(std::string_view);
};
 
} // namespace task
 
#endif