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Function reduce¶

`function` reduce(const E1 &, ReduceFn &&, TransformFn &&, FinalFn &&) base ¶

template <
    typename ReduceFn, typename TransformFn = fn_generic::pass_through,
    typename FinalFn = fn_generic::pass_through, typename E1, typename Tin = expression_value_type<E1>,
    typename Twork = std::decay_t<std::invoke_result_t<TransformFn, Tin>>,
    typename Tout = std::decay_t<std::invoke_result_t<internal::reduce_final_helper, FinalFn, size_t, Twork>>>
    requires(!input_expression<E1>)
KFR_INTRINSIC Tout reduce(const E1& e1, ReduceFn&& reducefn,
                          TransformFn&& transformfn = fn_generic::pass_through(),
                          FinalFn&& finalfn         = fn_generic::pass_through())

Reduces a range to a single value.

Template parameters
ReduceFn	Binary reduction functor.
TransformFn	Unary transform applied to each element (defaults to pass-through).
FinalFn	Finalizer applied to the accumulated value (defaults to pass-through).
E1	Range type.

Parameters
e1	Range to reduce.
reducefn	Binary reduction functor.
transformfn	Unary transform applied to each element.
finalfn	Finalizer applied to the accumulated value.

Returns
	The reduced value.

Fully qualified name: kfr::reduce(const E1 &, ReduceFn &&, TransformFn &&, FinalFn &&)

Declared at base/reduce.hpp:238

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