int compare(basic_string_view<charT, traits> sv) const noexcept;
Effects:
Determines the effective length
rlen
of the strings to compare as the smaller of
size()
and
sv.size(). The function then compares the two strings by calling
traits::compare(data(), sv.data(), rlen).Returns:
The nonzero result if the result of the comparison is nonzero
. Otherwise, returns a value as indicated in Table
58.Table
58 —
compare() results
Condition | Return Value |
size() < sv.size() | < 0 |
size() == sv.size() | 0 |
size() > sv.size() | > 0 |
int compare(size_type pos1, size_type n1, basic_string_view<charT, traits> sv) const;
Effects:
Equivalent to:
return basic_string_view<charT, traits>(data(), size()).substr(pos1, n1).compare(sv);
template<class T>
int compare(size_type pos1, size_type n1, const T& t,
size_type pos2, size_type n2 = npos) const;
Effects:
Equivalent to:
basic_string_view<charT, traits> sv = t;
return basic_string_view<charT, traits>(
data(), size()).substr(pos1, n1).compare(sv.substr(pos2, n2)); Remarks:
This function shall not participate in overload resolution
unless
is_convertible_v<const T&, basic_string_view<charT, traits>>
is
true and
is_convertible_v<const T&, const charT*> is
false. int compare(const basic_string& str) const noexcept;
Effects:
Equivalent to:
return compare(basic_string_view<charT, traits>(str));
int compare(size_type pos1, size_type n1, const basic_string& str) const;
Effects:
Equivalent to:
return compare(pos1, n1, basic_string_view<charT, traits>(str));
int compare(size_type pos1, size_type n1,
const basic_string& str,
size_type pos2, size_type n2 = npos) const;
Effects: Equivalent to:
return compare(pos1, n1, basic_string_view<charT, traits>(str), pos2, n2);
int compare(const charT* s) const;
Returns:
compare(basic_string(s)). int compare(size_type pos, size_type n1, const charT* s) const;
Returns: basic_string(*this, pos, n1).compare(basic_string(s)). int compare(size_type pos, size_type n1, const charT* s, size_type n2) const;
Returns: basic_string(*this, pos, n1).compare(basic_string(s, n2)).