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

 

C++

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Concepts library (C++20)

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Technical Specifications

 

Strings library

Null-terminated strings

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Classes

basic_string

basic_string_view (C++17)

char_traits

 

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::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<< operator""sv Helper classes hash<std::string_view>hash<std::wstring_view>hash<std::u16string_view>hash<std::u32string_view>

 

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

Finds the first character equal to any of the characters in the given character sequence.

1) Finds the first occurence of any of the characters of v in this view, starting at position pos.

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

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

4) Equivalent to find_first_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 search for
s	-	pointer to a string of characters to search for
ch	-	character to search for

Return value

Position of the first occurrence of any character of the substring, or npos if no such character is found.

Complexity

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

See also

find	find characters in the view (public member function)
rfind	find the last occurrence of a substring (public member function)
find_last_of	find last occurrence of characters (public member function)
find_first_not_of	find first absence of characters (public member function)
find_last_not_of	find last absence of characters (public member function)