tmp/tmpqyavkdsp/{from.md → to.md}
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| 1 |
+
### Transform inclusive scan <a id="transform.inclusive.scan">[[transform.inclusive.scan]]</a>
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| 2 |
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| 3 |
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``` cpp
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template<class InputIterator, class OutputIterator,
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class BinaryOperation, class UnaryOperation>
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OutputIterator transform_inclusive_scan(InputIterator first, InputIterator last,
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OutputIterator result,
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BinaryOperation binary_op,
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UnaryOperation unary_op);
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template<class ExecutionPolicy,
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class ForwardIterator1, class ForwardIterator2,
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class BinaryOperation, class UnaryOperation>
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ForwardIterator2 transform_inclusive_scan(ExecutionPolicy&& exec,
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ForwardIterator1 first, ForwardIterator1 last,
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ForwardIterator2 result,
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BinaryOperation binary_op,
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UnaryOperation unary_op);
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template<class InputIterator, class OutputIterator,
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class BinaryOperation, class UnaryOperation, class T>
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OutputIterator transform_inclusive_scan(InputIterator first, InputIterator last,
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OutputIterator result,
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BinaryOperation binary_op,
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UnaryOperation unary_op,
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T init);
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template<class ExecutionPolicy,
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class ForwardIterator1, class ForwardIterator2,
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class BinaryOperation, class UnaryOperation, class T>
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ForwardIterator2 transform_inclusive_scan(ExecutionPolicy&& exec,
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ForwardIterator1 first, ForwardIterator1 last,
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| 30 |
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ForwardIterator2 result,
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| 31 |
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BinaryOperation binary_op,
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UnaryOperation unary_op,
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T init);
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```
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*Requires:*
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- If `init` is provided, `T` shall be `MoveConstructible`
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| 39 |
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(Table [[tab:moveconstructible]]); otherwise, `ForwardIterator1`’s
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| 40 |
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value type shall be `MoveConstructible`.
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- If `init` is provided, all of
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| 42 |
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- `binary_op(init, init)`,
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| 43 |
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- `binary_op(init, unary_op(*first))`, and
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| 44 |
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- `binary_op(unary_op(*first), unary_op(*first))`
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shall be convertible to `T`; otherwise,
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`binary_op(unary_op(*first), unary_op(*first))` shall be convertible
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to `ForwardIterator1`’s value type.
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- Neither `unary_op` nor `binary_op` shall invalidate iterators or
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subranges, nor modify elements in the ranges \[`first`, `last`\] or
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\[`result`, `result + (last - first)`\].
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| 52 |
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| 53 |
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*Effects:* For each integer `K` in \[`0`, `last - first`) assigns
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| 54 |
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through `result + K` the value of
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| 55 |
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- *GENERALIZED_NONCOMMUTATIVE_SUM*(
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| 57 |
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binary_op, init,
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| 58 |
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unary_op(\*(first + 0)), unary_op(\*(first + 1)), ...,
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| 59 |
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unary_op(\*(first + K)))
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| 60 |
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if `init` is provided, or
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| 61 |
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- *GENERALIZED_NONCOMMUTATIVE_SUM*(
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| 62 |
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binary_op,
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| 63 |
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unary_op(\*(first + 0)), unary_op(\*(first + 1)), ...,
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| 64 |
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unary_op(\*(first + K)))
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| 65 |
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otherwise.
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| 66 |
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*Returns:* The end of the resulting range beginning at `result`.
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| 68 |
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*Complexity:* 𝑂(`last - first`) applications each of `unary_op` and
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| 70 |
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`binary_op`.
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| 71 |
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*Remarks:* `result` may be equal to `first`.
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| 73 |
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[*Note 1*: The difference between `transform_exclusive_scan` and
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| 75 |
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`transform_inclusive_scan` is that `transform_inclusive_scan` includes
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| 76 |
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the iᵗʰ input element in the iᵗʰ sum. If `binary_op` is not
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mathematically associative, the behavior of `transform_inclusive_scan`
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| 78 |
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may be nondeterministic. `transform_inclusive_scan` does not apply
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| 79 |
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`unary_op` to `init`. — *end note*]
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| 80 |
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