#### deferred_t::operator()

Creates a new deferred from a function.

    template<
        typename Function>
    constraint< !is_deferred< typename decay< Function >::type >::value, deferred_function< typename decay< Function >::type > >::type operator()(
        Function && function) const;
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Passes through anything that is already deferred.

    template<
        typename T>
    constraint< is_deferred< typename decay< T >::type >::value, typename decay< T >::type >::type operator()(
        T && t) const;
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