| (1) | ||
explicit forward_list( const Allocator& alloc = Allocator() ); | (since C++11) (until C++14) | |
forward_list() : forward_list( Allocator() ) {}
explicit forward_list( const Allocator& alloc ); | (since C++14) | |
forward_list( size_type count,
const T& value,
const Allocator& alloc = Allocator()); | (2) | (since C++11) |
| (3) | ||
explicit forward_list( size_type count ); | (since C++11) (until C++14) | |
explicit forward_list( size_type count, const Allocator& alloc = Allocator() ); | (since C++14) | |
template< class InputIt >
forward_list( InputIt first, InputIt last,
const Allocator& alloc = Allocator() ); | (4) | (since C++11) |
forward_list( const forward_list& other ); | (5) | (since C++11) |
forward_list( const forward_list& other, const Allocator& alloc ); | (5) | (since C++11) |
forward_list( forward_list&& other ) | (6) | (since C++11) |
forward_list( forward_list&& other, const Allocator& alloc ); | (6) | (since C++11) |
forward_list( std::initializer_list<T> init,
const Allocator& alloc = Allocator() ); | (7) | (since C++11) |
Constructs a new container from a variety of data sources, optionally using a user supplied allocator alloc.
1) Default constructor. Constructs an empty container.
2) Constructs the container with
count copies of elements with value value. 4) Constructs the container with the contents of the range
[first, last). This constructor has the same effect as overload (2) if InputIt is an integral type. | (until C++11) |
This overload only participates in overload resolution if InputIt satisfies InputIterator , to avoid ambiguity with the overload (2). | (since C++11) |
5) Copy constructor. Constructs the container with the copy of the contents of
other. If alloc is not provided, allocator is obtained by calling std::allocator_traits<allocator_type>::select_on_container_copy_construction(other.get_allocator(). 6) Move constructor. Constructs the container with the contents of
other using move semantics. If alloc is not provided, allocator is obtained by move-construction from the allocator belonging to other. 7) Constructs the container with the contents of the initializer list
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
1) Constant
2-3) Linear in
count 4) Linear in distance between
first and last 5) Linear in size of
other 6) Constant. If
alloc is given and alloc != other.get_allocator(), then linear. 7) Linear in size of
init Example
#include <forward_list>
#include <string>
#include <iostream>
template<typename T>
std::ostream& operator<<(std::ostream& s, const std::forward_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::forward_list<std::string> words1 {"the", "frogurt", "is", "also", "cursed"};
std::cout << "words1: " << words1 << '\n';
// words2 == words1
std::forward_list<std::string> words2(words1.begin(), words1.end());
std::cout << "words2: " << words2 << '\n';
// words3 == words1
std::forward_list<std::string> words3(words1);
std::cout << "words3: " << words3 << '\n';
// words4 is {"Mo", "Mo", "Mo", "Mo", "Mo"}
std::forward_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]
See also
| assigns values to the container (public member function) | |
| operator=
| assigns values to the container (public member function) |
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