tmp/tmpufwcjwft/{from.md → to.md}
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##### Invocation <a id="func.wrap.move.inv">[[func.wrap.move.inv]]</a>
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``` cpp
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explicit operator bool() const noexcept;
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```
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*Returns:* `true` if `*this` has a target object, otherwise `false`.
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``` cpp
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R operator()(ArgTypes... args) cv ref noexcept(noex);
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```
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*Preconditions:* `*this` has a target object.
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*Effects:* Equivalent to:
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``` cpp
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return INVOKE<R>(static_cast<F inv-quals>(f), std::forward<ArgTypes>(args)...);
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```
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where `f` is an lvalue designating the target object of `*this` and `F`
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is the type of `f`.
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