Memoizer.inl

/*
 * Copyright(c) Sophist Solutions, Inc. 1990-2025.  All rights reserved
 */
#include "Stroika/Foundation/Containers/Common.h"
 
namespace Stroika::Foundation::Cache {
 
    /*
     ********************************************************************************
     ******************************** Cache::Memoizer *******************************
     ********************************************************************************
     */
    template <typename RESULT, template <typename, typename> class CACHE, typename... ARGS>
    Memoizer<RESULT, CACHE, ARGS...>::Memoizer (const function<RESULT (ARGS...)>& f, CACHE<tuple<ARGS...>, RESULT>&& cache)
        : fFunction_{f}
        , fCache_{forward<CACHE<tuple<ARGS...>, RESULT>> (cache)}
    {
    }
    template <typename RESULT, template <typename, typename> class CACHE, typename... ARGS>
    RESULT Memoizer<RESULT, CACHE, ARGS...>::operator() (ARGS... args)
    {
        // Lookup the value in the cache, and if that fails, call fFunction_ (and add that to the cache)
        return fCache_.LookupValue (make_tuple (args...), [&] (const tuple<ARGS...>& t) { return apply (fFunction_, t); });
    }
 
}