constexpr size_type rfind( basic_string_view v, size_type pos = npos ) const noexcept; | (1) | (since C++17) |
constexpr size_type rfind( CharT ch, size_type pos = npos ) const noexcept; | (2) | (since C++17) |
constexpr size_type rfind( const CharT* s, size_type pos, size_type count ) const; | (3) | (since C++17) |
constexpr size_type rfind( const CharT* s, size_type pos = npos ) const; | (4) | (since C++17) |
Finds the last substring that is equal to the given character sequence. The search begins at pos
and proceeds from right to left (thus, the found substring, if any, cannot begin in a position following pos
). If npos
or any value not smaller than size() - 1
is passed as pos
, the whole string will be searched.
v
in this view, starting at position pos
.rfind(basic_string_view(std::addressof(ch), 1), pos)
.rfind(basic_string_view(s, count), pos)
.rfind(basic_string_view(s), pos)
.v | - | view to search for |
pos | - | position at which to start the search |
count | - | length of substring to search for |
s | - | pointer to a character string to search for |
ch | - | character to search for |
Position of the first character of the found substring or npos
if no such substring is found.
O(size()
* v.size()
) at worst.
#include <string_view> int main() { using namespace std::literals; constexpr auto N = std::string_view::npos; static_assert(true && (6 == "AB AB AB"sv.rfind("AB")) && (6 == "AB AB AB"sv.rfind("ABCD", N, 2)) && (3 == "AB AB AB"sv.rfind("AB", 5)) && (0 == "AB CD EF"sv.rfind("AB", 0)) && (2 == "B AB AB "sv.rfind("AB", 2)) && (N == "B AB AB "sv.rfind("AB", 1)) && (5 == "B AB AB "sv.rfind('A')) && (4 == "AB AB AB"sv.rfind('B', 4)) && (N == "AB AB AB"sv.rfind('C')) ); }
(C++17) | find characters in the view (public member function) |
(C++17) | find first occurrence of characters (public member function) |
(C++17) | find last occurrence of characters (public member function) |
(C++17) | find first absence of characters (public member function) |
(C++17) | find last absence of characters (public member function) |
find the last occurrence of a substring (public member function of std::basic_string<CharT,Traits,Allocator> ) |
© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
https://en.cppreference.com/w/cpp/string/basic_string_view/rfind