(C++17) | ||||
| Sequence | ||||
(C++11) | ||||
(C++26) | ||||
(C++26) | ||||
(C++11) | ||||
| Associative | ||||
| Unordered associative | ||||
(C++11) | ||||
(C++11) | ||||
(C++11) | ||||
(C++11) | ||||
| Adaptors | ||||
(C++23) | ||||
(C++23) | ||||
(C++23) | ||||
(C++23) | ||||
| Views | ||||
(C++20) | ||||
(C++23) | ||||
| Tables | ||||
| Iterator invalidation | ||||
| Member function table | ||||
| Non-member function table |
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| Non-member functions | |||||||||||||||||||||
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| Deduction guides(C++17) | |||||||||||||||||||||
void pop_front(); | (constexpr since C++26) | |
Removes the first element of the container.
Ifempty() istrue, the behavior is undefined. | (until C++26) |
Ifempty() istrue:
| (since C++26) |
Iterators and references to the erased element are invalidated. If the element is the last element in the container, theend() iterator is also invalidated. Other references and iterators are not affected.
Constant.
#include <deque>#include <iostream> int main(){std::deque<char> chars{'A','B','C','D'}; for(;!chars.empty(); chars.pop_front())std::cout<<"chars.front(): '"<< chars.front()<<"'\n";}
Output:
chars.front(): 'A'chars.front(): 'B'chars.front(): 'C'chars.front(): 'D'
| removes the last element (public member function)[edit] | |
| inserts an element to the beginning (public member function)[edit] | |
| access the first element (public member function)[edit] |
