openended_registry.hpp

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#pragma once
 
 
#include <tagval/entry.hpp>
 
#include <algorithm>
#include <span>
#include <string_view>
#include <vector>
 
namespace tagval {
 
template <typename Owner>
class OpenEndedRegistry {
public:
    static void add(const TagValMetadata* m) {
        if (m == nullptr) {
            return;
        }
        auto& v = storage();
        if (std::ranges::any_of(v, [&](const auto* x) { return x->code == m->code; })) {
            return;
        }
        v.push_back(m);
    }
 
    [[nodiscard]] static std::span<const TagValMetadata* const> all() noexcept {
        return std::span<const TagValMetadata* const>{storage()};
    }
 
    [[nodiscard]] static const TagValMetadata* find(std::string_view code) noexcept {
        const auto& v = storage();
        const auto it = std::ranges::find_if(v, [&](const auto* m) { return m->code == code; });
        return it == v.end() ? nullptr : *it;
    }
 
private:
    [[nodiscard]] static std::vector<const TagValMetadata*>& storage() {
        static std::vector<const TagValMetadata*> v;
        return v;
    }
};
 
}  // namespace tagval