std::basic_string_view<CharT,Traits>::find_first_of
< cpp | string | basic string 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 characters in the view (public member function) | |
find the last occurrence of a substring (public member function) | |
find last occurrence of characters (public member function) | |
find first absence of characters (public member function) | |
find last absence of characters (public member function) |