size_type size() const; | (until C++11) | |
size_type size() const noexcept; | (since C++11) |
Returns the number of elements in the container, i.e. std::distance(begin(), end())
.
(none).
The number of elements in the container.
Constant.
The following code uses size
to display the number of elements in a std::vector<int>
:
#include <vector> #include <iostream> int main() { std::vector<int> nums {1, 3, 5, 7}; std::cout << "nums contains " << nums.size() << " elements.\n"; }
Output:
nums contains 4 elements.
returns the number of elements that can be held in currently allocated storage (public member function) |
|
checks whether the container is empty (public member function) |
|
returns the maximum possible number of elements (public member function) |
|
changes the number of elements stored (public member function) |
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