void push_back( const T& value ); | (1) | |
void push_back( T&& value ); | (2) | (since C++11) |
Appends the given element value
to the end of the container.
1) The new element is initialized as a copy of
value
. 2)
value
is moved into the new element.If the new size()
is greater than capacity()
then all iterators and references (including the past-the-end iterator) are invalidated. Otherwise only the past-the-end iterator is invalidated.
Parameters
value | - | the value of the element to append |
Type requirements | ||
- T must meet the requirements of CopyInsertable in order to use overload (1). | ||
- T must meet the requirements of MoveInsertable in order to use overload (2). |
Return value
(none).
Complexity
Amortized constant.
Exceptions
If an exception is thrown, this function has no effect (strong exception guarantee).
If T 's move constructor is not noexcept and T is not CopyInsertable into *this , vector will use the throwing move constructor. If it throws, the guarantee is waived and the effects are unspecified. | (since C++11) |
Example
#include <vector> #include <iostream> #include <iomanip> int main() { std::vector<std::string> numbers; numbers.push_back("abc"); std::string s = "def"; numbers.push_back(std::move(s)); std::cout << "vector holds: "; for (auto&& i : numbers) std::cout << std::quoted(i) << ' '; std::cout << "\nMoved-from string holds " << std::quoted(s) << '\n'; }
Output:
vector holds: "abc" "def" Moved-from string holds ""
See also
(C++11) | constructs an element in-place at the end (public member function) |
removes the last element (public member function) |
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