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Showing content from https://en.cppreference.com/w/cpp/language/../regex/basic_regex/../match_results/match_results.html below:

std::match_results<BidirIt,Alloc>::match_results - cppreference.com

match_results() : match_results(Allocator()) {}

(1)

explicit match_results( const Allocator& a );

(2)

match_results( const match_results& rhs );

(3)

match_results( const match_results& rhs, const Allocator& a );

(4)

match_results( match_results&& rhs ) noexcept;

(5)

match_results( match_results&& rhs, const Allocator& a );

(6)

1,2) Constructs a match result with no established result state.

1) The default constructor.

2) Constructs the match result using a copy of a as the allocator.

When the construction finishes,

ready()

returns

false

and

size()

returns

​0​

.

3-6) Constructs a match result from rhs.

3) The copy constructor.

4) Constructs the match result using a copy of a as the allocator.

5) The move constructor. When the construction finishes, rhs is in a valid but unspecified state.

6) Constructs the match result using a copy of a as the allocator. When the construction finishes, rhs is in a valid but unspecified state.

Given the value of

rhs

before the construction as

m

and any integer in

[​0​, m.size())

as

n

, when the construction finishes, the following member functions should return the specified values:

[edit] Parameters a - allocator to use for all memory allocations of this container rhs - another match_results to use as source to initialize the match_results with [edit] Exceptions

1-4) May throw implementation-defined exceptions.

6) Throws nothing if a == rhs.get_allocator() is true.

[edit] Example [edit] 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 2191 C++11 n could be negative in the postconditions of overloads (3-6) can only be non-negative LWG 2195 C++11 the constructors required by AllocatorAwareContainer were missing added P0935R0 C++11 default constructor was explicit made implicit

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