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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../../cpp/container/deque/push_back.html below:

std::deque<T,Allocator>::push_back - cppreference.com

void push_back( const T& value );

(1) (constexpr since C++26)

void push_back( T&& value );

(2) (since C++11)
(constexpr since C++26)

Appends a copy of value to the end of the container.

All iterators (including the end() iterator) are invalidated. No references are invalidated.

[edit] Parameters value - the value of the element to append Type requirements -If the following condition is met, the behavior is undefined: (since C++11) [edit] Complexity

Constant.

[edit] 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).

[edit] Example

Possible output:

std::deque letters holds: "abc" "def"
Moved-from string s holds: ""
[edit] See also

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