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#### General <a id="func.wrap.general">[[func.wrap.general]]</a>
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Subclause [[func.wrap]] describes polymorphic wrapper classes that
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encapsulate arbitrary callable objects.
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#### General <a id="func.wrap.general">[[func.wrap.general]]</a>
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Subclause [[func.wrap]] describes polymorphic wrapper classes that
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encapsulate arbitrary callable objects.
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Let `t` be an object of a type that is a specialization of `function`,
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`copyable_function`, or `move_only_function`, such that the target
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object `x` of `t` has a type that is a specialization of `function`,
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`copyable_function`, or `move_only_function`. Each argument of the
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invocation of `x` evaluated as part of the invocation of `t` may alias
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an argument in the same position in the invocation of `t` that has the
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same type, even if the corresponding parameter is not of reference type.
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[*Example 1*:
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``` cpp
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move_only_function<void(T)> f{copyable_function<void(T)>{[](T) {}}};
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T t;
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f(t); // it is unspecified how many copies of T are made
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```
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— *end example*]
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*Recommended practice:* Implementations should avoid double wrapping
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when constructing polymorphic wrappers from one another.
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