std::basic_string_view<CharT,Traits>::find_first_not_of

 

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basic_string

basic_string_view (C++17)

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std::basic_string_view

Member functions basic_string_view::basic_string_view    basic_string_view::operator= Iterators basic_string_view::beginbasic_string_view::cbegin basic_string_view::endbasic_string_view::cend basic_string_view::rbeginbasic_string_view::crbegin basic_string_view::rendbasic_string_view::crend Element access basic_string_view::at basic_string_view::operator[] basic_string_view::front basic_string_view::back basic_string_view::data Capacity basic_string_view::sizebasic_string_view::length basic_string_view::max_size basic_string_view::empty Modifiers basic_string_view::remove_prefix basic_string_view::remove_suffix basic_string_view::swap

Operations basic_string_view::copy basic_string_view::substr basic_string_view::compare basic_string_view::starts_with (C++20) basic_string_view::ends_with (C++20) basic_string_view::contains (C++23) basic_string_view::find basic_string_view::rfind basic_string_view::find_first_of basic_string_view::find_last_of basic_string_view::find_first_not_of basic_string_view::find_last_not_of Constants basic_string_view::npos Non-member functions operator==operator!=operator<operator>operator<=operator>=operator<=> (until C++20)(until C++20)(until C++20)(until C++20)(until C++20)(C++20) operator<< operator""sv Helper classes hash<std::string_view>hash<std::wstring_view>hash<std::u8string_view>hash<std::u16string_view>hash<std::u32string_view> (C++20) Deduction guides(C++20)

 

constexpr size_type     find_first_not_of( basic_string_view v, size_type pos = 0 ) const noexcept;	(1)	(since C++17)
constexpr size_type     find_first_not_of( CharT c, size_type pos = 0 ) const noexcept;	(2)	(since C++17)
constexpr size_type     find_first_not_of( const CharT* s, size_type pos, size_type count ) const;	(3)	(since C++17)
constexpr size_type     find_first_not_of( const CharT* s, size_type pos = 0 ) const;	(4)	(since C++17)

Finds the first character not equal to any of the characters in the given character sequence.

1) Finds the first character not equal to any of the characters of v in this view, starting at position pos.

2) Equivalent to find_first_not_of(basic_string_view(std::addressof(c), 1), pos).

3) Equivalent to find_first_not_of(basic_string_view(s, count), pos).

4) Equivalent to find_first_not_of(basic_string_view(s), pos).

Parameters

v	-	view to search for
pos	-	position at which to start the search
count	-	length of the string of characters to compare
s	-	pointer to a string of characters to compare
ch	-	character to compare

Return value

Position of the first character not equal to any of the characters in the given string, or npos if no such character is found.

Complexity

O(size() * v.size()) at worst.

Example

Run this code

#include <string_view>
using namespace std::literals;
 
int main()
{
    static_assert(2 == "BCDEF"sv.find_first_not_of("ABC"));
                    //    ^
    static_assert(4 == "BCDEF"sv.find_first_not_of("ABC", 4));
                    //      ^
    static_assert(1 == "BCDEF"sv.find_first_not_of('B'));
                    //   ^
    static_assert(3 == "BCDEF"sv.find_first_not_of('D', 2));
                    //     ^
}

See also

find (C++17)	find characters in the view (public member function)
rfind (C++17)	find the last occurrence of a substring (public member function)
find_first_of (C++17)	find first occurrence of characters (public member function)
find_last_of (C++17)	find last occurrence of characters (public member function)
find_last_not_of (C++17)	find last absence of characters (public member function)
find_first_not_of	find first absence of characters (public member function of std::basic_string<CharT,Traits,Allocator>)