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HTTP/1.1 301 Moved Permanently
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Date: Wed, 30 Jul 2025 20:51:51 GMT
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Connection: keep-alive
Location: /reference/forward_list/forward_list/pop_front/
HTTP/1.1 200 OK
Server: nginx
Date: Wed, 30 Jul 2025 20:51:51 GMT
Content-Type: text/html; charset=utf-8
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ETag: W/"8399-LCL4BunWQzOOm+PEJqxUFjuIquo"
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Removes the first element in the forward_list container, effectively reducing its size by one.
This destroys the removed element.
Output:
All other iterators, pointers and reference keep their validity.
The first element is modified. Concurrently accessing or modifying other elements is safe.
Otherwise, it causes undefined behavior.
Reference
C library:
- <cassert> (assert.h)
- <cctype> (ctype.h)
- <cerrno> (errno.h)
-
<cfenv> (fenv.h)C++11
- <cfloat> (float.h)
-
<cinttypes> (inttypes.h)C++11
- <ciso646> (iso646.h)
- <climits> (limits.h)
- <clocale> (locale.h)
- <cmath> (math.h)
- <csetjmp> (setjmp.h)
- <csignal> (signal.h)
- <cstdarg> (stdarg.h)
-
<cstdbool> (stdbool.h)C++11
- <cstddef> (stddef.h)
-
<cstdint> (stdint.h)C++11
- <cstdio> (stdio.h)
- <cstdlib> (stdlib.h)
- <cstring> (string.h)
-
<ctgmath> (tgmath.h)C++11
- <ctime> (time.h)
-
<cuchar> (uchar.h)C++11
- <cwchar> (wchar.h)
- <cwctype> (wctype.h)
Containers:
-
<array>C++11
- <deque>
-
<forward_list>C++11
- <list>
- <map>
- <queue>
- <set>
- <stack>
-
<unordered_map>C++11
-
<unordered_set>C++11
- <vector>
-
Input/Output:
Multi-threading:
-
<atomic>C++11
-
<condition_variable>C++11
-
<future>C++11
-
<mutex>C++11
-
<thread>C++11
-
Other:
- <algorithm>
- <bitset>
-
<chrono>C++11
-
<codecvt>C++11
- <complex>
- <exception>
- <functional>
-
<initializer_list>C++11
- <iterator>
- <limits>
- <locale>
- <memory>
- <new>
- <numeric>
-
<random>C++11
-
<ratio>C++11
-
<regex>C++11
- <stdexcept>
- <string>
-
<system_error>C++11
-
<tuple>C++11
-
<type_traits>C++11
-
<typeindex>C++11
- <typeinfo>
- <utility>
- <valarray>
<forward_list>
-
forward_listC++11
forward_list
-
forward_list::~forward_listC++11
-
forward_list::forward_listC++11
member functions
-
forward_list::assignC++11
-
forward_list::before_beginC++11
-
forward_list::beginC++11
-
forward_list::cbefore_beginC++11
-
forward_list::cbeginC++11
-
forward_list::cendC++11
-
forward_list::clearC++11
-
forward_list::emplace_afterC++11
-
forward_list::emplace_frontC++11
-
forward_list::emptyC++11
-
forward_list::endC++11
-
forward_list::erase_afterC++11
-
forward_list::frontC++11
-
forward_list::get_allocatorC++11
-
forward_list::insert_afterC++11
-
forward_list::max_sizeC++11
-
forward_list::mergeC++11
-
forward_list::operator=C++11
-
forward_list::pop_frontC++11
-
forward_list::push_frontC++11
-
forward_list::removeC++11
-
forward_list::remove_ifC++11
-
forward_list::resizeC++11
-
forward_list::reverseC++11
-
forward_list::sortC++11
-
forward_list::splice_afterC++11
-
forward_list::swapC++11
-
forward_list::uniqueC++11
-
non-member overloads
- Reference
- <forward_list>
- forward_list
- pop_front
public member function
<forward_list>
std::forward_list::pop_front
void pop_front();
Delete first element
This destroys the removed element.
Parameters
noneReturn value
noneExample
|
|
Popping out the elements in mylist: 10 20 30 40 |
Complexity
Constant.Iterator validity
Iterators, pointers and references referring to element removed by the function are invalidated.All other iterators, pointers and reference keep their validity.
Data races
The container is modified.The first element is modified. Concurrently accessing or modifying other elements is safe.
Exception safety
If the container is not empty, the function never throws exceptions (no-throw guarantee).Otherwise, it causes undefined behavior.
See also
- forward_list::push_front
- Insert element at beginning (public member function)
- forward_list::emplace_front
- Construct and insert element at beginning (public member function)
- forward_list::remove
- Remove elements with specific value (public member function)
- forward_list::clear
- Clear content (public member function)
- forward_list::resize
- Change size (public member function)
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© cplusplus.com, 2000-2025 - All rights reserved - v3.3.4s
Spotted an error? contact us