std::list<T,Allocator>::list
list(); explicit list( const Allocator& alloc ); | (1) | |
(2) | ||
explicit list( size_type count, const T& value = T(), const Allocator& alloc = Allocator()); | (until C++11) | |
list( size_type count, const T& value, const Allocator& alloc = Allocator()); | (since C++11) | |
(3) | ||
explicit list( size_type count ); | (since C++11) (until C++14) | |
explicit list( size_type count, const Allocator& alloc = Allocator() ); | (since C++14) | |
template< class InputIt > list( InputIt first, InputIt last, const Allocator& alloc = Allocator() ); | (4) | |
list( const list& other ); | (5) | |
list( const list& other, const Allocator& alloc ); | (5) | (since C++11) |
list( list&& other ); | (6) | (since C++11) |
list( list&& other, const Allocator& alloc ); | (7) | (since C++11) |
list( std::initializer_list<T> init, const Allocator& alloc = Allocator() ); | (8) | (since C++11) |
Constructs a new container from a variety of data sources, optionally using a user supplied allocator alloc
.
count
copies of elements with value value
.[first, last)
. This constructor has the same effect as list(static_cast<size_type>(first), static_cast<value_type>(last), a) if InputIt is an integral type. | (until C++11) |
This overload only participates in overload resolution if InputIt satisfies LegacyInputIterator, to avoid ambiguity with the overload (2). | (since C++11) |
other
. If alloc
is not provided, allocator is obtained as if by calling std::allocator_traits<allocator_type>::select_on_container_copy_construction(other.get_allocator())
.other
using move semantics. Allocator is obtained by move-construction from the allocator belonging to other
. alloc
as the allocator for the new container, moving the contents from other
; if alloc != other.get_allocator()
, this results in an element-wise move. init
. Parameters
alloc | - | allocator to use for all memory allocations of this container |
count | - | the size of the container |
value | - | the value to initialize elements of the container with |
first, last | - | the range to copy the elements from |
other | - | another container to be used as source to initialize the elements of the container with |
init | - | initializer list to initialize the elements of the container with |
Complexity
count
first
and last
other
alloc != other.get_allocator()
, otherwise constant.init
.Exceptions
Calls to Allocator::allocate
may throw.
Notes
After container move construction (overload (6)), references, pointers, and iterators (other than the end iterator) to other
remain valid, but refer to elements that are now in *this
. The current standard makes this guarantee via the blanket statement in §23.2.1[container.requirements.general]/12, and a more direct guarantee is under consideration via LWG 2321.
Example
#include <list> #include <string> #include <iostream> template<typename T> std::ostream& operator<<(std::ostream& s, const std::list<T>& v) { s.put('['); char comma[3] = {'\0', ' ', '\0'}; for (const auto& e : v) { s << comma << e; comma[0] = ','; } return s << ']'; } int main() { // c++11 initializer list syntax: std::list<std::string> words1 {"the", "frogurt", "is", "also", "cursed"}; std::cout << "words1: " << words1 << '\n'; // words2 == words1 std::list<std::string> words2(words1.begin(), words1.end()); std::cout << "words2: " << words2 << '\n'; // words3 == words1 std::list<std::string> words3(words1); std::cout << "words3: " << words3 << '\n'; // words4 is {"Mo", "Mo", "Mo", "Mo", "Mo"} std::list<std::string> words4(5, "Mo"); std::cout << "words4: " << words4 << '\n'; }
Output:
words1: [the, frogurt, is, also, cursed] words2: [the, frogurt, is, also, cursed] words3: [the, frogurt, is, also, cursed] words4: [Mo, Mo, Mo, Mo, Mo]
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 2193 | C++11 | the default constructor is explicit | made non-explicit |
See also
assigns values to the container (public member function) |
|
assigns values to the container (public member function) |
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