operator==,!=(std::match_results)
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< cpp | regex | match results
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operator==operator!=
(until C++20)
Defined in header
<regex>
template< class BidirIt, class Alloc >
(1)
(since C++11)
bool operator==( match_results<BidirIt,Alloc>& lhs,
template< class BidirIt, class Alloc >
(2)
(since C++11) bool operator!=( match_results<BidirIt,Alloc>& lhs,
(until C++20)
Compares two match_results objects.
Two match_results are equal if the following conditions are met:
- neither of the objects is ready, or
- both match results are ready and the following conditions are met:
- lhs.empty() and rhs.empty(), or
- !lhs.empty() and !rhs.empty() and the following conditions are met:
- lhs.prefix() == rhs.prefix()
- lhs.size() == rhs.size() && std::equal (lhs.begin(), lhs.end(), rhs.begin())
- lhs.suffix() == rhs.suffix()
1) Checks if lhs and rhs are equal.
2) Checks if lhs and rhs are not equal.
The != operator is synthesized from operator==.
Contents
[edit] Parameters
lhs, rhs
-
match results to compare
Type requirements
-
BidirIt must meet the requirements of LegacyBidirectionalIterator.
-
Alloc must meet the requirements of Allocator.
[edit] Return value
1) true if lhs and rhs are equal, false otherwise.
2) true if lhs and rhs are not equal, false otherwise.
[edit] Exceptions
May throw implementation-defined exceptions.
[edit] Example
This section is incomplete
Reason: no example
Reason: no example