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cppdraft/indirectcallable/traits.md

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+[indirectcallable.traits]
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+# 24 Iterators library [[iterators]](./#iterators)
+
+## 24.3 Iterator requirements [[iterator.requirements]](iterator.requirements#indirectcallable.traits)
+
+### 24.3.6 Indirect callable requirements [[indirectcallable]](indirectcallable#traits)
+
+#### 24.3.6.2 Indirect callable traits [indirectcallable.traits]
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L2436)
+
+To implement algorithms taking projections,
+it is necessary to determine the projected type of an iterator's value type[.](#1.sentence-1)
+
+For the exposition-only alias template *indirect-value-t*,*indirect-value-t*<T> denotes
+
+- [(1.1)](#1.1)
+
+invoke_result_t<Proj&, *indirect-value-t*<I>> if T names projected<I, Proj>, and
+
+- [(1.2)](#1.2)
+
+iter_value_t<T>& otherwise[.](#1.sentence-2)