20 Strings library [strings]

20.3 String classes [string.classes]

20.3.3 Non-member functions [string.nonmembers]

20.3.3.3 operator!= [string.op!=]

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template<class charT, class traits, class Allocator> bool operator!=(const basic_string<charT, traits, Allocator>& lhs, const basic_string<charT, traits, Allocator>& rhs) noexcept;
1
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Returns: !(lhs == rhs).
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template<class charT, class traits, class Allocator> bool operator!=(const charT* lhs, const basic_string<charT, traits, Allocator>& rhs);
2
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Returns: rhs != lhs.
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template<class charT, class traits, class Allocator> bool operator!=(const basic_string<charT, traits, Allocator>& lhs, const charT* rhs);
3
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Requires: rhs points to an array of at least traits​::​length(rhs) + 1 elements of charT.
4
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Returns: lhs.compare(rhs) != 0.