Namespaces
Variants

    std::basic_string<CharT,Traits,Allocator>::find_first_not_of

    From cppreference.com
     
    C++
     
    Strings library
     
    std::basic_string
     
    size_type find_first_not_of( const basic_string& str,
                             size_type pos = 0 ) const;
    		(1) (noexcept since C++11)
    (constexpr since C++20)    		 
    size_type find_first_not_of( const CharT* s,
                             size_type pos, size_type count ) const;
    		(2) (constexpr since C++20) 
    size_type find_first_not_of( const CharT* s,
                             size_type pos = 0 ) const;
    		(3) (constexpr since C++20) 
    size_type find_first_not_of( CharT ch, size_type pos = 0 ) const;
    		(4) (noexcept since C++11)
    (constexpr since C++20)    		 
    template< class StringViewLike >
size_type
    find_first_not_of( const StringViewLike& t,
                       size_type pos = 0 ) const noexcept(/* see below */);
    		(5) (since C++17)
    (constexpr since C++20)

    Finds the first character equal to none of the characters in the given character sequence. The search considers only the range [pos, size()). If all characters in the range can be found in the given character sequence, npos will be returned.

    1) Finds the first character equal to none of characters in str.
    2) Finds the first character equal to none of characters in range [s, s + count). This range can include null characters.
    If [s, s + count) is not a valid range, the behavior is undefined.
    3) Finds the first character equal to none of characters in character string pointed to by s. The length of the string is determined by the first null character using Traits::length(s).
    If [s, s + Traits::length(s)) is not a valid range, the behavior is undefined.
    4) Finds the first character not equal to ch.
    5) Implicitly converts t to a string view sv as if by std::basic_string_view<CharT, Traits> sv = t;, then finds the first character equal to none of characters in sv.
    This overload participates in overload resolution only if std::is_convertible_v<const StringViewLike&,
    std::basic_string_view<CharT, Traits>>     is true and std::is_convertible_v<const StringViewLike&, const CharT*> is false.

    In all cases, equality is checked by calling Traits::eq.