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cppdraft/algorithms/parallel/user.md

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+[algorithms.parallel.user]
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+# 26 Algorithms library [[algorithms]](./#algorithms)
+
+## 26.3 Parallel algorithms [[algorithms.parallel]](algorithms.parallel#user)
+
+### 26.3.2 Requirements on user-provided function objects [algorithms.parallel.user]
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/algorithms.tex#L370)
+
+Unless otherwise specified,
+invocable objects passed into parallel algorithms as objects of a type
+denoted by a template parameter namedPredicate,BinaryPredicate,Compare,UnaryOperation,BinaryOperation,BinaryOperation1,BinaryOperation2,BinaryDivideOp, or
+constrained by a concept that subsumes [regular_invocable](concept.regularinvocable#concept:regular_invocable "18.7.3 Concept regular_­invocable [concept.regularinvocable]") and the operators used by the analogous overloads to these parallel algorithms
+that are formed by an invocation
+with the specified default predicate or operation (where applicable)
+shall not directly or indirectly modify objects via their arguments,
+nor shall they rely on the identity of the provided objects[.](#1.sentence-1)