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std::vector::emplace_back

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< cpp‎ | container‎ | vector

 
 
 
std::vector
Member-Funktionen
Original:
Member functions
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vector::vector
vector::~vector
vector::operator=
vector::assign
vector::get_allocator
Elementzugriff zerstört
Original:
Element access
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vector::at
vector::operator[]
vector::front
vector::back
vector::data(C++11)
Iteratoren
Original:
Iterators
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vector::begin
vector::cbegin

(C++11)
vector::end
vector::cend

(C++11)
vector::rbegin
vector::crbegin

(C++11)
vector::rend
vector::crend

(C++11)
Kapazität
Original:
Capacity
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vector::empty
vector::size
vector::max_size
vector::reserve
vector::capacity
vector::shrink_to_fit(C++11)
Modifiers
Original:
Modifiers
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vector::clear
vector::insert
vector::emplace(C++11)
vector::erase
vector::push_back
vector::emplace_back(C++11)
vector::pop_back
vector::resize
vector::swap
 
template< class... Args >
void emplace_back( Args&&... args );
(seit C++11)
Fügt ein neues Element am Ende des Behälters. Das Element in-place ist so aufgebaut, dh kein Kopieren oder Verschieben von Operationen durchgeführt werden. Der Konstruktor des Elements wird mit genau den gleichen Argumenten, die an die Funktion geliefert werden genannt .
Original:
Appends a new element to the end of the container. The element is constructed in-place, i.e. no copy or move operations are performed. The constructor of the element is called with exactly the same arguments that are supplied to the function.
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If the new size() is greater than capacity(), all iterators and references are invalidated. Otherwise no iterators and references are invalidated.

Inhaltsverzeichnis

[Bearbeiten] Parameter

args -
Argumente, die an den Konstruktor des Elements weiterzuleiten
Original:
arguments to forward to the constructor of the element
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[Bearbeiten] Rückgabewert

(None)
Original:
(none)
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[Bearbeiten] Komplexität

Constant .
Original:
Constant.
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[Bearbeiten] Beispiel

Der folgende Code verwendet emplace_back ein Objekt vom Typ President einer std::vector anhängen. Es zeigt, wie emplace_back vorne Parameter an die President Konstruktor und zeigt, wie mit emplace_back vermeidet die zusätzlichen Kopieren oder Verschieben erforderlich, wenn push_back .
Original:
The following code uses emplace_back to append an object of type President to a std::vector. It demonstrates how emplace_back forwards parameters to the President constructor and shows how using emplace_back avoids the extra copy or move operation required when using push_back.
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#include <vector>
#include <string>
#include <iostream>
 
struct President
{
    std::string name;
    std::string country;
    int year;
 
    President(std::string && p_name, std::string && p_country, int p_year)
        : name(std::move(p_name)), country(std::move(p_country)), year(p_year)
    {
        std::cout << "I am being constructed.\n";
    }
    President(President&& other)
        : name(std::move(other.name)), country(std::move(other.country)), year(other.year)
    {
        std::cout << "I am being moved.\n";
    }
    President& operator=(const President& other) = default;
};
 
int main()
{
    std::vector<President> elections;
    std::cout << "emplace_back:\n";
    elections.emplace_back("Nelson Mandela", "South Africa", 1994);
 
    std::vector<President> reElections;
    std::cout << "\npush_back:\n";
    reElections.push_back(President("Franklin Delano Roosevelt", "the USA", 1936));
 
    std::cout << "\nContents:\n";
    for (President const& president: elections) {
        std::cout << president.name << " was elected president of "
                  << president.country << " in " << president.year << ".\n";
    }
    for (President const& president: reElections) {
        std::cout << president.name << " was re-elected president of "
                  << president.country << " in " << president.year << ".\n";
    }
}

Output:

emplace_back:
I am being constructed.
 
push_back:
I am being constructed.
I am being moved.
 
Contents:
Nelson Mandela was elected president of South Africa in 1994.
Franklin Delano Roosevelt was re-elected president of the USA in 1936.

[Bearbeiten] Siehe auch

fügt Elemente am Ende
Original:
adds elements to the end
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(öffentliche Elementfunktion) [edit]