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std::basic_string_view::rfind(3) | C++ Standard Libary | std::basic_string_view::rfind(3) |
NAME¶
std::basic_string_view::rfind - std::basic_string_view::rfind
Synopsis¶
constexpr size_type rfind( basic_string_view v, size_type pos =
(1) (since C++17)
npos ) const noexcept;
constexpr size_type rfind( CharT c, size_type pos = npos ) const (2)
(since C++17)
noexcept;
constexpr size_type rfind( const CharT* s, size_type pos, (3)
(since C++17)
size_type count ) const;
constexpr size_type rfind( const CharT* s, size_type pos = npos ) (4)
(since C++17)
const;
Finds the last substring equal to the given character sequence.
1) Finds the last occurrence of v in this view, starting at position pos.
2) Equivalent to rfind(basic_string_view(std::addressof(c), 1), pos).
3) Equivalent to rfind(basic_string_view(s, count), pos).
4) Equivalent to rfind(basic_string_view(s), pos).
Parameters¶
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
Return value¶
Position of the first character of the found substring or npos if
no such substring
is found.
Complexity¶
O(size() * v.size()) at worst.
Example¶
// Run this code
#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))
&& (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'))
);
}
See also¶
find find characters in the view
(C++17) (public member function)
find_first_of find first occurrence of characters
(C++17) (public member function)
find_last_of find last occurrence of characters
(C++17) (public member function)
find_first_not_of find first absence of characters
(C++17) (public member function)
find_last_not_of find last absence of characters
(C++17) (public member function)
find the last occurrence of a substring
rfind (public member function of
std::basic_string<CharT,Traits,Allocator>)
2022.07.31 | http://cppreference.com |