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    cpp/utility/functional/function ref/operator=: Difference between revisions

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    @1@ Copy assignment operator is explicitly-defaulted. {{tt|std::function_ref}} satisfies {{lconcept|copyable}} and {{named req|TriviallyCopyable}}. This defaulted assignment operator performs a shallow copy of the stored {{tti|thunk-ptr}} and {{tti|bound-entity}}.
    @1@ Copy assignment operator is explicitly-defaulted. {{tt|std::function_ref}} satisfies {{lconcept|copyable}} and {{named req|TriviallyCopyable}}. This defaulted assignment operator performs a shallow copy of the stored {{|thunk-ptr}} and {{|bound-entity}}.


    @2@ User-defined assignment operator is explicitly-deleted if {{c|T}} is not the same type as {{tt|std::function_ref}}, {{c|std::is_pointer_v<T>}} is {{c|false}}, and {{c|T}} is not a specialization of {{lc|std::nontype_t}}. This overload participates in overload resolution only if the constraints are satisfied in the conditions above.
    @2@ User-defined assignment operator is explicitly-deleted if {{c|T}} is not the same type as {{tt|std::function_ref}}, {{c|std::is_pointer_v<T>}} is {{c|false}}, and {{c|T}} is not a specialization of {{lc|std::nontype_t}}. This overload participates in overload resolution only if the constraints are satisfied in the conditions above.
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    {{dsc inc|cpp/utility/functional/function/dsc operator{{=}}}}
    {{dsc inc|cpp/utility/functional/function/dsc operator{{=}}}}
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    {{langlinks|de|es|fr|it|ja|pt|ru|zh}}
    {{langlinks|de|es|fr|it|ja|pt|ru|zh}}

    Latest revision as of 12:47, 26 November 2024

     
    C++
     
    Utilities library
    General utilities
    Relational operators (deprecated in C++20)
     
    Function objects
    Function invocation
    (C++17)(C++23)
    Identity function object
    (C++20)
    Transparent operator wrappers
    (C++14)
    (C++14)
    (C++14)
    (C++14)  
    (C++14)
    (C++14)
    (C++14)
    (C++14)
    (C++14)
    (C++14)
    (C++14)
    (C++14)
    (C++14)
    (C++14)
    (C++14)
    (C++14)
    (C++14)
    (C++14)
    (C++14)

    Old binders and adaptors
    (until C++17*)
    (until C++17*)
    (until C++17*)
    (until C++17*)
    (until C++17*)  
    (until C++17*)
    (until C++17*)(until C++17*)(until C++17*)(until C++17*)
    (until C++20*)
    (until C++20*)
    (until C++17*)(until C++17*)
    (until C++17*)(until C++17*)

    (until C++17*)
    (until C++17*)(until C++17*)(until C++17*)(until C++17*)
    (until C++20*)
    (until C++20*)
     
    std::function_ref
     
    constexpr function_ref& operator=( const function_ref& ) noexcept = default;
    		(1) (since C++26) 
    template< class T > 
constexpr function_ref& operator=( T ) = delete;
    		(2) (since C++26)
    1) Copy assignment operator is explicitly-defaulted. std::function_ref satisfies copyable and TriviallyCopyable. This defaulted assignment operator performs a shallow copy of the stored thunk-ptr and bound-entity.
    2) User-defined assignment operator is explicitly-deleted if T is not the same type as std::function_ref, std::is_pointer_v<T> is false, and T is not a specialization of std::nontype_t. This overload participates in overload resolution only if the constraints are satisfied in the conditions above.

    Return value

    *this

    See also

    		 constructs a new function_ref object
    (public member function) [edit]
    		replaces or destroys the target
    (public member function of std::copyable_function) [edit]
    		assigns a new target
    (public member function of std::function<R(Args...)>) [edit]
    		replaces or destroys the target
    (public member function of std::move_only_function) [edit]