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cppdraft/exec/queryable/concept.md

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+[exec.queryable.concept]
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+# 33 Execution control library [[exec]](./#exec)
+
+## 33.2 Queries and queryables [[exec.queryable]](exec.queryable#concept)
+
+### 33.2.2 queryable concept [exec.queryable.concept]
+
+namespace std {template<class T>concept [*queryable*](#concept:queryable "33.2.2 queryable concept [exec.queryable.concept]") = [destructible](concept.destructible#concept:destructible "18.4.10 Concept destructible [concept.destructible]")<T>; // *exposition only*}
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/exec.tex#L159)
+
+The exposition-only [*queryable*](#concept:queryable "33.2.2 queryable concept [exec.queryable.concept]") concept specifies
+the constraints on the types of queryable objects[.](#1.sentence-1)
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/exec.tex#L163)
+
+Let env be an object of type Env[.](#2.sentence-1)
+
+The type Env models [*queryable*](#concept:queryable "33.2.2 queryable concept [exec.queryable.concept]") if for each callable object q and a pack of subexpressions args,
+if requires { q(env, args...) } is true thenq(env, args...) meets any semantic requirements imposed by q[.](#2.sentence-2)