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operator==,!=,<,<=,>,>=,<=>(std::sub_match)

Defined in header <regex>
Direct comparison 
template< class BidirIt >
bool operator== ( const std::sub_match<BidirIt>& lhs, 
                  const std::sub_match<BidirIt>& rhs );
(1) (since C++11) 
template< class BidirIt >
bool operator!= ( const std::sub_match<BidirIt>& lhs, 
                  const std::sub_match<BidirIt>& rhs );
(2) (since C++11)
(until C++20) 
template< class BidirIt >
bool operator<  ( const std::sub_match<BidirIt>& lhs, 
                  const std::sub_match<BidirIt>& rhs );
(3) (since C++11)
(until C++20) 
template< class BidirIt >
bool operator<= ( const std::sub_match<BidirIt>& lhs, 
                  const std::sub_match<BidirIt>& rhs );
(4) (since C++11)
(until C++20) 
template< class BidirIt >
bool operator>  ( const std::sub_match<BidirIt>& lhs, 
                  const std::sub_match<BidirIt>& rhs );
(5) (since C++11)
(until C++20) 
template< class BidirIt >
bool operator>= ( const std::sub_match<BidirIt>& lhs, 
                  const std::sub_match<BidirIt>& rhs );
(6) (since C++11)
(until C++20) 
template< class BidirIt >
auto operator<=>( const std::sub_match<BidirIt>& lhs, 
                  const std::sub_match<BidirIt>& rhs );
(7) (since C++20)
Comparing with a std::basic_string 
template< class BidirIt, class Traits, class Alloc >
bool operator== ( const std::sub_match<BidirIt>& lhs,
                  const std::basic_string</*value-type-of*/<BidirIt>,
                                          Traits, Alloc>& str );
(8) (since C++11) 
template< class BidirIt, class Traits, class Alloc >
bool operator!= ( const std::sub_match<BidirIt>& lhs,
                  const std::basic_string</*value-type-of*/<BidirIt>,
                                          Traits, Alloc>& str );
(9) (since C++11)
(until C++20) 
template< class BidirIt, class Traits, class Alloc >
bool operator<  ( const std::sub_match<BidirIt>& lhs,
                  const std::basic_string</*value-type-of*/<BidirIt>,
                                          Traits, Alloc>& str );
(10) (since C++11)
(until C++20) 
template< class BidirIt, class Traits, class Alloc >
bool operator<= ( const std::sub_match<BidirIt>& lhs,
                  const std::basic_string</*value-type-of*/<BidirIt>,
                                          Traits, Alloc>& str );
(11) (since C++11)
(until C++20) 
template< class BidirIt, class Traits, class Alloc >
bool operator>  ( const std::sub_match<BidirIt>& lhs,
                  const std::basic_string</*value-type-of*/<BidirIt>,
                                          Traits, Alloc>& str );
(12) (since C++11)
(until C++20) 
template< class BidirIt, class Traits, class Alloc >
bool operator>= ( const std::sub_match<BidirIt>& lhs,
                  const std::basic_string</*value-type-of*/<BidirIt>,
                                          Traits, Alloc>& str );
(13) (since C++11)
(until C++20) 
template< class BidirIt, class Traits, class Alloc >
auto operator<=>( const std::sub_match<BidirIt>& lhs,
                  const std::basic_string</*value-type-of*/<BidirIt>,
                                          Traits, Alloc>& str );
(14) (since C++20) 
template< class BidirIt, class Traits, class Alloc >
bool operator== ( const std::basic_string</*value-type-of*/<BidirIt>,
                                          Traits, Alloc>& str,
                  const std::sub_match<BidirIt>& rhs );
(15) (since C++11)
(until C++20) 
template< class BidirIt, class Traits, class Alloc >
bool operator!= ( const std::basic_string</*value-type-of*/<BidirIt>,
                                          Traits, Alloc>& str,
                  const std::sub_match<BidirIt>& rhs );
(16) (since C++11)
(until C++20) 
template< class BidirIt, class Traits, class Alloc >
bool operator<  ( const std::basic_string</*value-type-of*/<BidirIt>,
                                          Traits, Alloc>& str,
                  const std::sub_match<BidirIt>& rhs );
(17) (since C++11)
(until C++20) 
template< class BidirIt, class Traits, class Alloc >
bool operator<= ( const std::basic_string</*value-type-of*/<BidirIt>,
                                          Traits, Alloc>& str,
                  const std::sub_match<BidirIt>& rhs );
(18) (since C++11)
(until C++20) 
template< class BidirIt, class Traits, class Alloc >
bool operator>  ( const std::basic_string</*value-type-of*/<BidirIt>,
                                          Traits, Alloc>& str,
                  const std::sub_match<BidirIt>& rhs );
(19) (since C++11)
(until C++20) 
template< class BidirIt, class Traits, class Alloc >
bool operator>= ( const std::basic_string</*value-type-of*/<BidirIt>,
                                          Traits, Alloc>& str,
                  const std::sub_match<BidirIt>& rhs );
(20) (since C++11)
(until C++20)
Comparing with a C-style string 
template< class BidirIt >
bool operator== ( const std::sub_match<BidirIt>& lhs,
                  const /*value-type-of*/<BidirIt>* s );
(21) (since C++11) 
template< class BidirIt >
bool operator!= ( const std::sub_match<BidirIt>& lhs,
                  const /*value-type-of*/<BidirIt>* s );
(22) (since C++11)
(until C++20) 
template< class BidirIt >
bool operator<  ( const std::sub_match<BidirIt>& lhs,
                  const /*value-type-of*/<BidirIt>* s );
(23) (since C++11)
(until C++20) 
template< class BidirIt >
bool operator<= ( const std::sub_match<BidirIt>& lhs,
                  const /*value-type-of*/<BidirIt>* s );
(24) (since C++11)
(until C++20) 
template< class BidirIt >
bool operator>  ( const std::sub_match<BidirIt>& lhs,
                  const /*value-type-of*/<BidirIt>* s );
(25) (since C++11)
(until C++20) 
template< class BidirIt >
bool operator>= ( const std::sub_match<BidirIt>& lhs,
                  const /*value-type-of*/<BidirIt>* s );
(26) (since C++11)
(until C++20) 
template< class BidirIt >
auto operator<=>( const std::sub_match<BidirIt>& lhs,
                  const /*value-type-of*/<BidirIt>* s );
(27) (since C++20) 
template< class BidirIt >
bool operator== ( const /*value-type-of*/<BidirIt>* s,
                  const std::sub_match<BidirIt>& rhs );
(28) (since C++11)
(until C++20) 
template< class BidirIt >
bool operator!= ( const /*value-type-of*/<BidirIt>* s,
                  const std::sub_match<BidirIt>& rhs );
(29) (since C++11)
(until C++20) 
template< class BidirIt >
bool operator<  ( const /*value-type-of*/<BidirIt>* s,
                  const std::sub_match<BidirIt>& rhs );
(30) (since C++11)
(until C++20) 
template< class BidirIt >
bool operator<= ( const /*value-type-of*/<BidirIt>* s,
                  const std::sub_match<BidirIt>& rhs );
(31) (since C++11)
(until C++20) 
template< class BidirIt >
bool operator>  ( const /*value-type-of*/<BidirIt>* s,
                  const std::sub_match<BidirIt>& rhs );
(32) (since C++11)
(until C++20) 
template< class BidirIt >
bool operator>= ( const /*value-type-of*/<BidirIt>* s,
                  const std::sub_match<BidirIt>& rhs );
(33) (since C++11)
(until C++20)
Comparing with a single character 
template< class BidirIt >
bool operator== ( const std::sub_match<BidirIt>& lhs,
                  const /*value-type-of*/<BidirIt>& ch );
(34) (since C++11) 
template< class BidirIt >
bool operator!= ( const std::sub_match<BidirIt>& lhs,
                  const /*value-type-of*/<BidirIt>& ch );
(35) (since C++11)
(until C++20) 
template< class BidirIt >
bool operator<  ( const std::sub_match<BidirIt>& lhs,
                  const /*value-type-of*/<BidirIt>& ch );
(36) (since C++11)
(until C++20) 
template< class BidirIt >
bool operator<= ( const std::sub_match<BidirIt>& lhs,
                  const /*value-type-of*/<BidirIt>& ch );
(37) (since C++11)
(until C++20) 
template< class BidirIt >
bool operator>  ( const std::sub_match<BidirIt>& lhs,
                  const /*value-type-of*/<BidirIt>& ch );
(38) (since C++11)
(until C++20) 
template< class BidirIt >
bool operator>= ( const std::sub_match<BidirIt>& lhs,
                  const /*value-type-of*/<BidirIt>& ch );
(39) (since C++11)
(until C++20) 
template< class BidirIt >
auto operator<=>( const std::sub_match<BidirIt>& lhs,
                  const /*value-type-of*/<BidirIt>& ch );
(40) (since C++20) 
template< class BidirIt >
bool operator== ( const /*value-type-of*/<BidirIt>& ch,
                  const std::sub_match<BidirIt>& rhs );
(41) (since C++11)
(until C++20) 
template< class BidirIt >
bool operator!= ( const /*value-type-of*/<BidirIt>& ch,
                  const std::sub_match<BidirIt>& rhs );
(42) (since C++11)
(until C++20) 
template< class BidirIt >
bool operator<  ( const /*value-type-of*/<BidirIt>& ch,
                  const std::sub_match<BidirIt>& rhs );
(43) (since C++11)
(until C++20) 
template< class BidirIt >
bool operator<= ( const /*value-type-of*/<BidirIt>& ch,
                  const std::sub_match<BidirIt>& rhs );
(44) (since C++11)
(until C++20) 
template< class BidirIt >
bool operator>  ( const /*value-type-of*/<BidirIt>& ch,
                  const std::sub_match<BidirIt>& rhs );
(45) (since C++11)
(until C++20) 
template< class BidirIt >
bool operator>= ( const /*value-type-of*/<BidirIt>& ch,
                  const std::sub_match<BidirIt>& rhs );
(46) (since C++11)
(until C++20)
Helper type aliases 
template< class BidirIt >
using /*value-type-of*/ =
    typename std::iterator_traits<BidirIt>::value_type;
(47) (exposition only*) 
template< class BidirIt >
using /*cat-type-of*/ =
    std::compare_three_way_result_t
        <std::basic_string</*value-type-of*/<BidirIt>>>;
(48) (since C++20)
(exposition only*)

Compares a sub_match to another sub_match, a std::string, a C-style string or a single character.

1-7) Compares two sub_match directly.
8-20) Compares a sub_match with a std::basic_string.
21-33) Compares a sub_match with a C-style string.
34-46) Compares a sub_match with a single character.

The <, <=, >, >=, and != operators are synthesized from operator<=> and operator== respectively.

 (since C++20)
47) value-type-of <BidirIt> is the value type of BidirIt.
48) cat-type-of <BidirIt> is the result type of three-way comparison of std::sub_match<BidirIt>.

Parameters

lhs, rhs - a sub_match to compare
str - a std::basic_string to compare
s - a pointer to a C-style string to compare
ch - a character to compare

Return value

Let target be the following values:

1-7) rhs
8-20) typename std::sub_match<BidirIt>::string_type(str.data(), str.size())
21-33) s
34-46) typename std::sub_match<BidirIt>::string_type(1, ch)

The return values are defined as follows:

Operator Return value
Overloads (1-14,21-27,34-40)
(overloads with parameter lhs) 		Overloads (15-20,28-33,41-46)
(overloads without parameter lhs)
== lhs.compare(target) == 0 rhs.compare(target) == 0
!= lhs.compare(target) != 0 rhs.compare(target) != 0
< lhs.compare(target) < 0 rhs.compare(target) > 0
<= lhs.compare(target) <= 0 rhs.compare(target) >= 0
> lhs.compare(target) > 0 rhs.compare(target) < 0
>= lhs.compare(target) >= 0 rhs.compare(target) <= 0
<=> static_cast<cat-type-of <BidirIt>>    (lhs.compare(target) <=> 0) N/A

Notes

The return type of operator<=> is guaranteed to be a comparison category type. If value-type-of <BidirIt> is char, wchar_t, char8_t, char16_t, or char32_t, the return type of operator<=> is std::strong_ordering.

Example

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior
LWG 2217 C++11 for comparisons with std::string, the
argument of compare() was str.c_str() 		the argument is
string_type(str.data(), str.size()))

See also

compare
 compares matched subsequence (if any)
(public member function)

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Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
https://en.cppreference.com/cpp/regex/sub_match/operator_cmp

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