Templates.h

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#pragma once
 
template <typename TCollection, typename TValue>
struct MapReturnValue {
    MapReturnValue(typename TCollection::const_iterator it, bool valid)
        : mIt(it)
        , mValid(valid)
    {}
 
    inline const TValue& val() {
        static const TValue emptyValue;
        if (mValid)
            return mIt->second;
        else
            return emptyValue;
    }
 
    inline operator bool() { return mValid; }
 
    inline static MapReturnValue<TCollection, TValue> Null() {
        return { typename TCollection::const_iterator(), false }
    }
private:
    bool mValid = false;
    typename TCollection::const_iterator mIt;
};