contexts.h

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#pragma once

#include <tuple>

namespace escad
{

template<class... T> struct contexts {
    explicit contexts(T&... ctxs) noexcept
        : contexts_ {ctxs...}
    {
    }

    template<class U>
    auto& get() noexcept {
        return std::get<std::add_lvalue_reference_t<U>>(contexts_);
    }

    template<class U>
    auto const& get() const noexcept {
        return std::get<std::add_lvalue_reference_t<U>>(contexts_);
    }

    template<class U>
    static auto constexpr has = mpl::type_list_contains_v<mpl::type_list<T...>, U>;

private:
    std::tuple<T&...> contexts_;
};

} // namespace fsm