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Type:
Bug
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Resolution: Not an Issue
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Priority:
P4
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None
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Affects Version/s: 8
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Component/s: core-libs
A DESCRIPTION OF THE PROBLEM :
It's about java.util.stream.Stream.reduce(U identity,BiFunction<U, ? super T, U> accumulator, BinaryOperator<U> combiner) documentation:
accumulator – an associative, non-interfering, stateless function for incorporating an additional element into a result
This means: (a op b) op c = a op (b op c).
The problem is that the above definition requires an BinaryOperator, not only a BiFunction, because (a op b) requires b of type T while (b op c) requires b of type U. If U and T are distinct, this is impossible.
FREQUENCY : always
It's about java.util.stream.Stream.reduce(U identity,BiFunction<U, ? super T, U> accumulator, BinaryOperator<U> combiner) documentation:
accumulator – an associative, non-interfering, stateless function for incorporating an additional element into a result
This means: (a op b) op c = a op (b op c).
The problem is that the above definition requires an BinaryOperator, not only a BiFunction, because (a op b) requires b of type T while (b op c) requires b of type U. If U and T are distinct, this is impossible.
FREQUENCY : always