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Returns the number of elements in the vector.
This is the number of actual objects held in the vector, which is not necessarily equal to its storage capacity.
Member type size_type is an unsigned integral type.
Output:
No contained elements are accessed: concurrently accessing or modifying them is safe.
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>
vector
- vector::~vector
- vector::vector
member functions
- vector::assign
- vector::at
- vector::back
- vector::begin
- vector::capacity
-
vector::cbeginC++11
-
vector::cendC++11
- vector::clear
-
vector::crbeginC++11
-
vector::crendC++11
-
vector::dataC++11
-
vector::emplaceC++11
-
vector::emplace_backC++11
- 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
-
vector::shrink_to_fitC++11
- vector::size
- vector::swap
non-member overloads
public member function
<vector>
std::vector::size
size_type size() const;
size_type size() const noexcept;
Return size
This is the number of actual objects held in the vector, which is not necessarily equal to its storage capacity.
Parameters
noneReturn Value
The number of elements in the container.Member type size_type is an unsigned integral type.
Example
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Output:
0. size: 0 1. size: 10 2. size: 20 3. size: 19 |
Complexity
Constant.Iterator validity
No changes.Data races
The container is accessed.No contained elements are accessed: concurrently accessing or modifying them is safe.
Exception safety
No-throw guarantee: this member function never throws exceptions.See also
- vector::capacity
- Return size of allocated storage capacity (public member function)
- vector::resize
- Change size (public member function)
- vector::max_size
- Return maximum size (public member function)
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Spotted an error? contact us