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

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    Cooky (talk | contribs)
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    m another typo. must be c++26
    Andreas Krug (talk | contribs)
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    m fmt
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    {{cpp/utility/functional/function_ref/title | operator{{=}}}}
    {{cpp/utility/functional/function_ref/title|operator{{=}}}}
    {{cpp/utility/functional/function_ref/navbar}}
    {{cpp/utility/functional/function_ref/navbar}}
    {{dcl begin}}
    {{dcl begin}}
    {{dcl | num=1 | since=c++26 | 1=
    {{dcl|num=1|since=c++26|1=
    constexpr function_ref& operator=( const function_ref& ) noexcept = default;
    constexpr function_ref& operator=( const function_ref& ) noexcept = default;
    }}
    }}
    {{dcl | num=2 | since=c++26 | 1=
    {{dcl|num=2|since=c++26|1=
    template< class T >  
    template< class T >  
    constexpr function_ref& operator=( T ) = delete;
    constexpr function_ref& operator=( T ) = delete;
    Line 20: Line 20:
    ===See also===
    ===See also===
    {{dsc begin}}
    {{dsc begin}}
    {{dsc inc | cpp/utility/functional/function_ref/dsc constructor}}
    {{dsc inc|cpp/utility/functional/function_ref/dsc constructor}}
    {{dsc inc | cpp/utility/functional/function/dsc operator{{=}}}}
    {{dsc inc|cpp/utility/functional/function/dsc operator{{=}}}}
    {{dsc begin}}
    {{dsc begin}}


    {{langlinks|de|es|fr|it|ja|pt|ru|zh}}
    {{langlinks|de|es|fr|it|ja|pt|ru|zh}}

    Revision as of 09:47, 4 January 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]
    		assigns a new target
    (public member function of std::function<R(Args...)>) [edit]