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std::{{{1}}}::{{{1}}}

من cppreference.com
(1)
explicit {{{1}}}( const Allocator& alloc = Allocator() );
قالب:mark since none
قالب:mark until c++14
{{{1}}}() : {{{1}}}( Allocator() ) {}
explicit {{{1}}}( const Allocator& alloc );
قالب:mark since c++14
(2)
explicit {{{1}}}( size_type count,

                  const T& value = T(),

                  const Allocator& alloc = Allocator());
(until C++11)
         {{{1}}}( size_type count,

                  const T& value,

                  const Allocator& alloc = Allocator());
(since C++11)
(3)
explicit {{{1}}}( size_type count );
(since C++11)
قالب:mark until c++14
explicit {{{1}}}( size_type count, const Allocator& alloc = Allocator() );
قالب:mark since c++14
template< class InputIt >

{{{1}}}( InputIt first, InputIt last,

         const Allocator& alloc = Allocator() );
(4) قالب:mark since none
{{{1}}}( const {{{1}}}& other );
(5) قالب:mark since none
{{{1}}}( const {{{1}}}& other, const Allocator& alloc );
(5) (since C++11)
{{{1}}}( {{{1}}}&& other )
(6) (since C++11)
{{{1}}}( {{{1}}}&& other, const Allocator& alloc );
(6) (since C++11)
{{{1}}}( std::initializer_list<T> init,
         const Allocator& alloc = Allocator() );
(7) (since C++11)

Constructs new container from a variety of data sources and optionally using user supplied allocator ‎alloc‎.

1) Default constructor. Constructs empty container.
2) Constructs the container with ‎count‎ copies of elements with value ‎value‎.
3) Constructs the container with ‎count‎ default-inserted instances of ‎T‎. No copies are made.
4) Constructs the container with the contents of the range ‎[first, last)‎.
This constructor has the same effect as overload قالب:v if ‎InputIt‎ is an integral type. (until C++11)
This overload only participate in overload resolution if ‎InputIt‎ satisfies InputIterator , to avoid ambiguity with the overload قالب:v. (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.

محتويات

[تعديل] 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

[تعديل] 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

[تعديل] Example

#include <{{{1}}}>
#include <string>
#include <iostream>
 
template<typename T>
std::ostream& operator<<(std::ostream& s, const std::{{{1}}}<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::{{{1}}}<std::string> words1 {"the", "frogurt", "is", "also", "cursed"};
    std::cout << "words1: " << words1 << '\n';
 
    // words2 == words1
    std::{{{1}}}<std::string> words2(words1.begin(), words1.end());
    std::cout << "words2: " << words2 << '\n';
 
    // words3 == words1
    std::{{{1}}}<std::string> words3(words1);
    std::cout << "words3: " << words3 << '\n';
 
    // words4 is {"Mo", "Mo", "Mo", "Mo", "Mo"}
    std::{{{1}}}<std::string> words4(5, "Mo");
    std::cout << "words4: " << words4 << '\n';
}

الخرج:

words1: [the, frogurt, is, also, cursed]
words2: [the, frogurt, is, also, cursed]
words3: [the, frogurt, is, also, cursed]
words4: [Mo, Mo, Mo, Mo, Mo]

[تعديل] See also

قالب:dsc mem funقالب:dsc mem fun