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    cpp/memory/memory resource/do is equal: Difference between revisions

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    {{cpp/memory/memory_resource/navbar}}
    {{cpp/memory/memory_resource/navbar}}
    {{ddcl|since=c++17|1=
    {{ddcl|since=c++17|1=
    virtual bool is_equal(const std::pmr::memory_resource& other) const = 0;
    virtual bool ( const std::pmr::memory_resource& other ) const = 0;
    }}
    }}


    Compares {{tt|*this}} for equality with {{tt|other}}.
    Compares {{|*this}} for equality with {{|other}}.


    Two {{tt|memory_resource}}s compare equal if and only if memory allocated from one {{tt|memory_resource}} can be deallocated from the other and vice versa.
    Two {{tt|memory_resource}}s compare equal if and only if memory allocated from one {{tt|memory_resource}} can be deallocated from the other and vice versa.


    === Notes ===
    === Notes ===
    The most-derived type of {{tt|other}} may not match the most derived type of {{tt|*this}}. A derived class implementation therefore must typically check whether the most derived types of {{tt|*this}} and {{tt|other}} match using {{lc|dynamic_cast}}, and immediately return {{tt|false}} if the cast fails.
    The most-derived type of {{|other}} may not match the most derived type of {{|*this}}. A derived class implementation therefore must typically check whether the most derived types of {{|*this}} and {{|other}} match using {{|dynamic_cast}}, and immediately return {{|false}} if the cast fails.
     
    === Exceptions ===
    {{unreviewed noexcept}}


    === See also ===
    === See also ===
    {{dsc begin}}
    {{dsc begin}}
    {{dsc inc| cpp/memory/memory_resource/dsc is_equal}}
    {{dsc inc|cpp/memory/memory_resource/dsc is_equal}}
    {{dsc end}}
    {{dsc end}}

    Latest revision as of 05:02, 20 July 2023

     
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    std::pmr::memory_resource
     
    virtual bool do_is_equal( const std::pmr::memory_resource& other ) const noexcept = 0;
    		(since C++17)

    Compares *this for equality with other.

    Two memory_resources compare equal if and only if memory allocated from one memory_resource can be deallocated from the other and vice versa.

    Notes

    The most-derived type of other may not match the most derived type of *this. A derived class implementation therefore must typically check whether the most derived types of *this and other match using dynamic_cast, and immediately return false if the cast fails.

    See also

    		 compare for equality with another memory_resource
    (public member function) [edit]