24 Strings library [strings]

24.3 String classes [string.classes]

24.3.2 Class template basic_­string [basic.string]

24.3.2.7 basic_­string string operations [string.ops]

24.3.2.7.4 basic_­string​::​find_­first_­of [string.find.first.of]

size_type find_first_of(basic_string_view<charT, traits> sv, size_type pos = 0) const noexcept;
1
#
Effects: Determines the lowest position xpos, if possible, such that both of the following conditions hold:
  • (1.1)
    pos <= xpos and xpos < size();
  • (1.2)
    traits​::​eq(at(xpos), sv.at(I)) for some element I of the data referenced by sv.
2
#
Returns: xpos if the function can determine such a value for xpos.
Otherwise, returns npos.
size_type find_first_of(const basic_string& str, size_type pos = 0) const noexcept;
3
#
Effects: Equivalent to: return find_­first_­of(basic_­string_­view<charT, traits>(str), pos);
size_type find_first_of(const charT* s, size_type pos, size_type n) const;
4
#
Returns: find_­first_­of(basic_­string_­view<charT, traits>(s, n), pos).
size_type find_first_of(const charT* s, size_type pos = 0) const;
5
#
Requires: s points to an array of at least traits​::​length(s) + 1 elements of charT.
6
#
Returns: find_­first_­of(basic_­string_­view<charT, traits>(s), pos).
size_type find_first_of(charT c, size_type pos = 0) const;
7
#
Returns: find_­first_­of(basic_­string(1, c), pos).