std::basic_string_view<CharT,Traits>::find_last_of
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std::basic_string_view
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(C++23)
basic_string_view::find_last_of
Constants
(until C++20)(until C++20)(until C++20)(until C++20)(until C++20)(C++20)
Deduction guides (C++20)
constexpr size_type
find_last_of( basic_string_view v, size_type pos = npos ) const noexcept;
(1)
(since C++17)
find_last_of( basic_string_view v, size_type pos = npos ) const noexcept;
constexpr size_type
find_last_of( CharT ch, size_type pos = npos ) const noexcept;
(2)
(since C++17)
find_last_of( CharT ch, size_type pos = npos ) const noexcept;
constexpr size_type
find_last_of( const CharT* s, size_type pos, size_type count ) const;
(3)
(since C++17)
find_last_of( const CharT* s, size_type pos, size_type count ) const;
constexpr size_type
find_last_of( const CharT* s, size_type pos = npos ) const;
(4)
(since C++17)
find_last_of( const CharT* s, size_type pos = npos ) const;
Finds the last character equal to one of characters in the given character sequence. Exact search algorithm is not specified. The search considers only the interval [0, pos]. If the character is not present in the interval, npos will be returned.
1) Finds the last occurence of any of the characters of v in this view, ending at position pos.
2) Equivalent to find_last_of(basic_string_view(std::addressof (ch), 1), pos).
3) Equivalent to find_last_of(basic_string_view(s, count), pos).
4) Equivalent to find_last_of(basic_string_view(s), pos).
[edit] Parameters
v
-
view to search for
pos
-
position at which the search is to finish
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
[edit] Return value
Position of the last occurrence of any character of the substring, or npos if no such character is found.
[edit] Complexity
O(size() * v.size() ) at worst.
[edit] Example
Run this code
#include <string_view> using namespace std::literals; constexpr auto N = std::string_view::npos ; static_assert( 5 == "delete"sv.find_last_of("cdef"sv) && // └────────────────────┘ N == "double"sv.find_last_of("fghi"sv) && // 0 == "else"sv.find_last_of("bcde"sv, 2 /* pos [0..2]: "els" */) && // └────────────────────────┘ N == "explicit"sv.find_last_of("abcd"sv, 4 /* pos [0..4]: "expli" */) && // 3 == "extern"sv.find_last_of('e') && // └────────────────────┘ N == "false"sv.find_last_of('x') && // 0 == "inline"sv.find_last_of('i', 2 /* pos [0..2]: "inl" */) && // └───────────────────────┘ N == "mutable"sv.find_last_of('a', 2 /* pos [0..2]: "mut" */) && // 3 == "namespace"sv.find_last_of("cdef", 3 /* pos [0..3]: "name" */, 3 /* "cde" */) && // └─────────────────────────┘ N == "namespace"sv.find_last_of("cdef", 3 /* pos [0..3]: "name" */, 2 /* "cd" */) ); int main() {}
[edit] See also
find last occurrence of characters
(public member function of
(public member function of
std::basic_string<CharT,Traits,Allocator>) [edit]