table of contents
std::deque::push_front(3) | C++ Standard Libary | std::deque::push_front(3) |
NAME¶
std::deque::push_front - std::deque::push_front
Synopsis¶
void push_front( const T& value );
void push_front( T&& value ); (since C++11)
Prepends the given element value to the beginning of the container.
All iterators, including the past-the-end iterator, are invalidated. No
references
are invalidated.
Parameters¶
value - the value of the element to prepend
Return value¶
(none)
Complexity¶
Constant.
Exceptions¶
If an exception is thrown, this function has no effect (strong exception guarantee).
Example¶
// Run this code
#include <deque>
#include <iostream>
#include <iomanip>
#include <string>
int main()
{
std::deque<std::string> letters;
letters.push_front("abc");
std::string s{"def"};
letters.push_front(std::move(s));
std::cout << "std::deque `letters` holds: ";
for (auto&& e : letters) std::cout << std::quoted(e) << '
';
std::cout << "\nMoved-from string `s` holds: " <<
std::quoted(s) << '\n';
}
Possible output:¶
std::deque `letters` holds: "def" "abc"
Moved-from string `s` holds: ""
See also¶
emplace_front constructs an element in-place at the beginning
(C++11) (public member function)
push_back adds an element to the end
(public member function)
pop_front removes the first element
(public member function)
creates a std::front_insert_iterator of type inferred from the
front_inserter argument
(function template)
2022.07.31 | http://cppreference.com |