optional_size_format.hpp

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#pragma once
 
#include <cstddef>
#include <format>
#include <optional>
 
template <>
struct std::formatter<std::optional<std::size_t>> {
    constexpr auto parse(std::format_parse_context &ctx)
    {
        return ctx.begin();
    }
 
    auto format(const std::optional<std::size_t> &value, auto &ctx) const
    {
        if (value.has_value()) {
            return std::format_to(ctx.out(), "{}", value.value());
        }
        return std::format_to(ctx.out(), "unset");
    }
};