size_type find_last_of(E c, size_type pos = npos) const;
size_type find_last_of(const E *s, size_type pos = npos) const;
size_type find_last_of(const E *s, size_type pos, size_type n = npos) const;
size_type find_last_of(const basic_string& str,
size_type pos = npos) const;
Each member function finds the last (highest position) element of the controlled sequence, at or before position
pos
, that matches any of the elements in the operand sequence specified by the remaining operands. If it succeeds, it
returns the position. Otherwise, the function returns npos
.