std::basic_string<CharT,Traits,Allocator>::find_last_not_of
| (1) | ||
size_type find_last_not_of( const basic_string& str, size_type pos = npos ) const; | (until C++11) | |
size_type find_last_not_of( const basic_string& str, size_type pos = npos ) const noexcept; | (since C++11) | |
size_type find_last_not_of( const CharT* s, size_type pos, size_type count ) const; | (2) | |
size_type find_last_not_of( const CharT* s, size_type pos = npos ) const; | (3) | |
| (4) | ||
size_type find_last_not_of( CharT ch, size_type pos = npos ) const; | (until C++11) | |
size_type find_last_not_of( CharT ch, size_type pos = npos ) const noexcept; | (since C++11) | |
template < class T > size_type find_last_not_of( const T& t, size_type pos = npos ) const noexcept(/* see below */); | (5) | (since C++17) |
Finds the last character equal to none of the characters in the given character sequence. 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 character equal to none of characters in
str.
2) Finds the last character equal to none of characters in the range
[s, s+count). This range can include null characters.
3) Finds the last character equal to none of characters in character string pointed to by
s. The length of the string is determined by the first null character using Traits::length(s).
4) Finds the last character not equal to
ch.
5) Implicitly converts
t to a string view sv as if by std::basic_string_view<CharT, Traits> sv = t;, then finds the last character equal to none of characters in sv. This overload only participates in overload resolution if std::is_convertible_v<const T&, std::basic_string_view<CharT, Traits>> is true and std::is_convertible_v<const T&, const CharT*> is false.In all cases, equality is checked by calling Traits::eq.
Parameters
| str | - | string identifying characters to search for |
| pos | - | position at which to begin searching |
| count | - | length of character string identifying characters to search for |
| s | - | pointer to a character string identifying characters to search for |
| ch | - | character identifying characters to search for |
| t | - | object (convertible to std::basic_string_view) identifying characters to search for |
Return value
Position of the found character or npos if no such character is found.
Exceptions
5)
noexcept specification: noexcept(std::is_nothrow_convertible_v<const T&, std::basic_string_view<charT, traits>>)Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
| DR | Applied to | Behavior as published | Correct behavior |
|---|---|---|---|
| LWG 2946 | C++17 | string_view overload causes ambiguity in some cases | avoided by making it a template |
Example
See also
| find characters in the string (public member function) |
|
| find the last occurrence of a substring (public member function) |
|
| find first occurrence of characters (public member function) |
|
| find first absence of characters (public member function) |
|
| find last occurrence of characters (public member function) |
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