22 General utilities library [utilities]

22.10 Function objects [function.objects]

22.10.17 Polymorphic function wrappers [func.wrap]

22.10.17.5 Copyable wrapper [func.wrap.copy]

22.10.17.5.5 Utility [func.wrap.copy.util]

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void swap(copyable_function& other) noexcept;
1
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Effects: Exchanges the target objects of *this and other.
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friend void swap(copyable_function& f1, copyable_function& f2) noexcept;
2
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Effects: Equivalent to f1.swap(f2).
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friend bool operator==(const copyable_function& f, nullptr_t) noexcept;
3
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Returns: true if f has no target object, otherwise false.