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HTTP/1.1 301 Moved Permanently Server: nginx Date: Sat, 19 Jul 2025 10:49:29 GMT Content-Type: text/html; charset=UTF-8 Transfer-Encoding: chunked Connection: keep-alive Location: /reference/vector/vector/clear/ HTTP/1.1 200 OK Server: nginx Date: Sat, 19 Jul 2025 10:49:30 GMT Content-Type: text/html; charset=utf-8 Transfer-Encoding: chunked Connection: keep-alive ETag: W/"7df7-4kGwrs+UiI7prqmj+n/llzfRU/E" Content-Encoding: gzip

TUTORIALS
REFERENCE
ARTICLES
FORUM

C++

Tutorials
Reference
Articles
Forum

Reference

C library:
- <cassert> (assert.h)
- <cctype> (ctype.h)
- <cerrno> (errno.h)
- C++11
  <cfenv> (fenv.h)
- <cfloat> (float.h)
- C++11
  <cinttypes> (inttypes.h)
- <ciso646> (iso646.h)
- <climits> (limits.h)
- <clocale> (locale.h)
- <cmath> (math.h)
- <csetjmp> (setjmp.h)
- <csignal> (signal.h)
- <cstdarg> (stdarg.h)
- C++11
  <cstdbool> (stdbool.h)
- <cstddef> (stddef.h)
- C++11
  <cstdint> (stdint.h)
- <cstdio> (stdio.h)
- <cstdlib> (stdlib.h)
- <cstring> (string.h)
- C++11
  <ctgmath> (tgmath.h)
- <ctime> (time.h)
- C++11
  <cuchar> (uchar.h)
- <cwchar> (wchar.h)
- <cwctype> (wctype.h)
Containers:
- C++11
  <array>
- <deque>
- C++11
  <forward_list>
- <list>
- <map>
- <queue>
- <set>
- <stack>
- C++11
  <unordered_map>
- C++11
  <unordered_set>
- <vector>
Input/Output:
- <fstream>
- <iomanip>
- <ios>
- <iosfwd>
- <iostream>
- <istream>
- <ostream>
- <sstream>
- <streambuf>
Multi-threading:
- C++11
  <atomic>
- C++11
  <condition_variable>
- C++11
  <future>
- C++11
  <mutex>
- C++11
  <thread>
Other:
- <algorithm>
- <bitset>
- C++11
  <chrono>
- C++11
  <codecvt>
- <complex>
- <exception>
- <functional>
- C++11
  <initializer_list>
- <iterator>
- <limits>
- <locale>
- <memory>
- <new>
- <numeric>
- C++11
  <random>
- C++11
  <ratio>
- C++11
  <regex>
- <stdexcept>
- <string>
- C++11
  <system_error>
- C++11
  <tuple>
- C++11
  <type_traits>
- C++11
  <typeindex>
- <typeinfo>
- <utility>
- <valarray>

<vector>

vector
vector<bool>

vector

vector::~vector
vector::vector
member functions
- vector::assign
- vector::at
- vector::back
- vector::begin
- vector::capacity
- C++11
  vector::cbegin
- C++11
  vector::cend
- vector::clear
- C++11
  vector::crbegin
- C++11
  vector::crend
- C++11
  vector::data
- C++11
  vector::emplace
- C++11
  vector::emplace_back
- vector::empty
- vector::end
- vector::erase
- vector::front
- vector::get_allocator
- vector::insert
- vector::max_size
- vector::operator[]
- vector::operator=
- vector::pop_back
- vector::push_back
- vector::rbegin
- vector::rend
- vector::reserve
- vector::resize
- C++11
  vector::shrink_to_fit
- vector::size
- vector::swap
non-member overloads
- relational operators (vector)
- swap (vector)

Reference
<vector>
vector
clear

public member function

std::vector::clear

void clear();

void clear() noexcept;

Clear content

Removes all elements from the vector (which are destroyed), leaving the container with a size of 0.

A reallocation is not guaranteed to happen, and the vector capacity is not guaranteed to change due to calling this function. A typical alternative that forces a reallocation is to use swap:

`1`	`vector<T>().swap(x); // clear x reallocating`

Parameters

none

Return value

none

Example

// clearing vectors
#include <iostream>
#include <vector>
int main ()
{
  std::vector<int> myvector;
  myvector.push_back (100);
  myvector.push_back (200);
  myvector.push_back (300);
  std::cout << "myvector contains:";
  for (unsigned i=0; i<myvector.size(); i++)
    std::cout << ' ' << myvector[i];
  std::cout << '\n';
  myvector.clear();
  myvector.push_back (1101);
  myvector.push_back (2202);
  std::cout << "myvector contains:";
  for (unsigned i=0; i<myvector.size(); i++)
    std::cout << ' ' << myvector[i];
  std::cout << '\n';
  return 0;
}

Output:

myvector contains: 100 200 300
myvector contains: 1101 2202

Complexity

Linear in size (destructions).
This may be optimized to constant complexity for trivially-destructible types (such as scalar or PODs), where elements need not be destroyed.

Iterator validity

All iterators, pointers and references related to this container are invalidated.

Data races

The container is modified.
All contained elements are modified.

Exception safety

No-throw guarantee: this member function never throws exceptions.

member functions

non-member overloads