std::basic_string_view<CharT,Traits>::rfind
constexpr size_type rfind( basic_string_view v, size_type pos = npos ) const noexcept; |
(1) | (since C++17) |
constexpr size_type rfind( CharT c, 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 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
#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
|
(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>) |
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