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std::basic_..._last_not_of(3) C++ Standard Libarystd::basic_..._last_not_of(3) NAME std::basic_string::find_last_not_of - std::ba- sic_string::find_last_not_of Synopsis size_type find_last_not_of( const (until basic_string& str, C++11) size_type pos = npos ) const; size_type find_last_not_of( const (since basic_string& str, C++11) size_type pos = npos ) const (until noexcept; C++20) constexpr size_type find_last_not_of( const (since basic_string& str, C++20) size_type pos = npos ) const noexcept; size_type find_last_not_of( const CharT* s, (until size_type pos, size_type count ) C++20) const; constexpr size_type find_last_not_of( const CharT* s, (since size_type pos, size_type count ) C++20) const; size_type find_last_not_of( const (until CharT* s, size_type pos = npos ) C++20) const; constexpr size_type (since find_last_not_of( const CharT* s, C++20) size_type pos = npos ) const; (1) size_type find_last_not_of( CharT (until ch, size_type pos = npos ) const; C++11) size_type find_last_not_of( CharT (since ch, size_type pos = npos ) const C++11) noexcept; (until (2) C++20) constexpr size_type find_last_not_of( CharT ch, (since size_type pos = npos ) const C++20) noexcept; (3) template < class StringViewLike > size_type (4) (since find_last_not_of( const C++17) StringViewLike& t, (until C++20) size_type pos = npos ) const noexcept(/* see below */); (5) template < class StringViewLike > constexpr size_type find_last_not_of( const (since StringViewLike& t, C++20) size_type pos = npos ) const noexcept(/* see below */); 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::ba- sic_string_view<CharT, Traits> sv = t;, then finds the last character equal to none of characters in sv. This overload participates in overload resolution only if std::is_convertible_v<const StringViewLike&, std::ba- sic_string_view<CharT, Traits>> is true and std::is_convertible_v<const StringViewLike&, 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::ba- sic_string_view<charT, traits>>) Example // Run this code #include <iostream> #include <string> void show_pos(const std::string& str, std::string::size_type found) { if (found != std::string::npos) { std::cout << "[" << found << "] = \'" << str[found] << "\'\n"; } else { std::cout << "not found" "\n"; } } int main() { std::string str { "abc_123" }; char const* skip_set { "0123456789" }; std::string::size_type str_last_pos { std::string::npos }; show_pos(str, str.find_last_not_of(skip_set)); // [3] = '_' str_last_pos = 2; show_pos(str, str.find_last_not_of(skip_set, str_last_pos)); // [2] = 'c' str_last_pos = 2; show_pos(str, str.find_last_not_of('c', str_last_pos)); // [1] = 'b' const char arr[] { '3','4','5' }; show_pos(str, str.find_last_not_of(arr)); // [5] = '2' str_last_pos = 2; std::string::size_type skip_set_size { 4 }; show_pos(str, str.find_last_not_of(skip_set, str_last_pos, skip_set_size)); // [2] = 'c' show_pos(str, str.find_last_not_of("abc")); // [6] = '3' str_last_pos = 2; show_pos(str, str.find_last_not_of("abc", str_last_pos)); // not found } Output: [3] = '_' [2] = 'c' [1] = 'b' [5] = '2' [2] = 'c' [6] = '3' not found Defect reports The following behavior-changing defect reports were applied retroac- tively to previously published C++ standards. DR Applied to Behavior as published Correct behavior LWG 2064 C++11 overload (3) and (4) were noexcept re- moved LWG 2946 C++17 string_view overload causes ambiguity in avoided by making it a some cases tem- plate P1148R0 C++11 noexcept for overload (4)/(5) was re- stored C++17 accidently dropped by LWG2064/LWG2946 See also find find characters in the string (public member function) rfind find the last occurrence of a substring (public member function) find_first_of find first occurrence of characters (public member function) find_first_not_of find first absence of characters (public member function) find_last_of find last occurrence of characters (public member function) find_last_not_of find last absence of characters (C++17) (public member function of std::ba- sic_string_view<CharT,Traits>) http://cppreference.com 2022.07.31 std::basic_..._last_not_of(3)
NAME | Synopsis | Parameters | Return value | Exceptions | Example | Output: | See also
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