std::string_view find_last_not_of() method

since C++17

// (1) Const version only
constexpr size_type find_last_not_of( const basic_string& str, size_type pos = 0 ) const noexcept;

// (2) Const version only
constexpr size_type find_last_not_of( const CharT* s, size_type pos, size_type count ) const;

// (3) Const version only
constexpr size_type find_last_not_of( const CharT* s, size_type pos = 0 ) const;

// (4) Const version only
constexpr size_type find_last_not_of( CharT ch, size_type pos = 0 ) const noexcept;

Finds the last character not equal to any of the characters in the given character sequence.
The search considers only the interval [ 0, pos ].

• (1) Finds the last character not equal to any of the characters of v in this view, starting at position pos.
• (2) Equivalent to find_last_not_of(basic_string_view(std::addressof(c), 1), pos).
• (3) Equivalent to find_last_not_of(basic_string_view(s, count), pos).
• (4) Equivalent to find_last_not_of(basic_string_view(s), pos).

Parameters

• v - view to search for
• pos - position at which to start the search
• count - length of the string of characters to compare
• s - pointer to a string of characters to compare
• ch - character to compare

Return value

Position of the last occurrence of any character of the substring, or npos if no such substring is found.

Complexity

O(size() * v.size()) at worst.

important

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Exceptions

(none)

Example

#include <string_view>
using std::operator""sv;
 
int main()
{
    static_assert(1 == "BCDEF"sv.find_last_not_of("DEF"));
                    //   ^
    static_assert(2 == "BCDEFG"sv.find_last_not_of("EFG", 3));
                    //    ^
    static_assert(2 == "ABBA"sv.find_last_not_of('A'));
                    //    ^
    static_assert(1 == "ABBA"sv.find_last_not_of('A', 1));
                    //   ^
}