Difference between revisions of "Template:cpp/container/push back"
From cppreference.com
(note about a possibility of length_error in vector and deque: looks like more than a few people have been caught by surprise) |
m (er, just vector (the deque example I saw had a custom allocator that threw)) |
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}} | }} | ||
| − | {{#ifeq: {{{1|}}} | vector | + | {{#ifeq: {{{1|}}} | vector | |
===Notes=== | ===Notes=== | ||
| − | Some implementations also throw {{lc|std::length_error}} when {{tt|push_back}} causes a reallocation that would exceed {{lc|max_size}}, due to implicitly calling an equivalent of {{lc|reserve(size()+1)}}. | + | Some implementations also throw {{lc|std::length_error}} when {{tt|push_back}} causes a reallocation that would exceed {{lc|max_size}}, due to implicitly calling an equivalent of {{lc|reserve(size()+1)}}.}} |
}} | }} | ||
Revision as of 05:22, 5 July 2016
| void push_back( const T& value ); |
(1) | (since {std}) |
| 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.| Information on iterator invalidation is copied from here |
Contents |
Parameters
| value | - | the value of the element to append |
| Type requirements | ||
Return value
(none)
Complexity
| Templated information. See page source. |
Exceptions
If an exception is thrown (which can be due to Allocator::allocate() or element copy/move constructor/assignment,), this function has no effect (strong exception guarantee).
}}
Example
Run this code
#include <{{{1}}}> #include <iostream> #include <iomanip> int main() { std::{{{1}}}<std::string> numbers; numbers.push_back("abc"); std::string s = "def"; numbers.push_back(std::move(s)); std::cout << "{{{1}}} holds: "; for (auto&& i : numbers) std::cout << std::quoted(i) << ' '; std::cout << "\nMoved-from string holds " << std::quoted(s) << '\n'; }
Output:
{{{1}}} holds: "abc" "def"
Moved-from string holds ""See also
| (C++11) |
constructs an element in-place at the end (public member function of std::{{{1}}})
|
| inserts an element to the beginning (public member function of std::{{{1}}})
| |
| removes the last element (public member function of std::{{{1}}})
|
