C++ concepts: Container
From cppreference.com
A Container
is an object used to store other objects and taking care of the management of the memory used by the objects it contains.
Contents |
[edit] Requirements
-
C
Container type -
T
Element type -
a
,b
Objects of typeC
[edit] Types
name | type | notes |
---|---|---|
value_type |
T |
Eraseable
|
reference |
T& | |
const_reference |
const T& | |
iterator |
iterator pointing to T |
ForwardIterator convertible to const_iterator
|
const_iterator |
const iterator pointing to T |
ForwardIterator
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difference_type |
signed integer | must be the same as iterator_traits::difference_type for iterator and const_iterator
|
size_type |
unsigned integer | large enough to represent all positive values of difference_type
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[edit] Methods and operators
expression | return type | semantics | conditions | complexity | |
---|---|---|---|---|---|
C() | C | Creates an empty container | Post: C().empty() == true | Constant | |
C(a) | C | Create a copy of a
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Pre: T must be CopyInsertable Post: a == C(a) |
Linear | |
a = b | C& | All elements of a are destroyed or move assigned to elements of b |
Post: a == b | Linear | |
(&a)->~C() | void | Destroy all elements and free all memory | Linear | ||
a.begin() | (const_)iterator | Iterator to the first element | Constant | ||
a.end() | (const_)iterator | Iterator to one past the last element | Constant | ||
a.cbegin()(since C++11) | const_iterator | const_cast<const C&>(a).begin() | Constant | ||
a.cend()(since C++11) | const_iterator | const_cast<const C&>(a).end() | Constant | ||
a == b | convertible to bool | std::equal(a.begin(), a.end(), b.begin(), b.end())(since C++14) | Pre: T must be EqualityComparable |
Constant[1] if a.size() != b.size() , linear otherwise
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|
a != b | convertible to bool | !(a==b) | Linear | ||
a.swap(b) | void | exchanges the values of a and b | Constant[2][3] | ||
swap(a,b) | void | a.swap(b) | Constant[2] | ||
a.size() | size_type | distance(a.begin(),a.end()) | Constant[3] | ||
a.max_size() | size_type | b.size() where b is the largest possible container | Constant[3] | ||
a.empty() | convertible to bool | a.begin() == a.end() | Constant | ||
notes | |||||
|
Given
In the expressions i == j, i != j, i < j, i <= j, i >= j, i > j, i - j, either or both may be replaced by an object of the container's |
(since C++14) |
[edit] Container data races
[edit] Other concepts
- C
- T