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C++ Vector Library - vector() Function
Description
The C++ fill constructor std::vector::vector() constructs a container of size n and assigns value val(if provided) to each element of the container.
Declaration
Following is the declaration for fill constructor std::vector::vector() form std::vector header.
C++98
explicit vector (size_type n, const value_type& val = value_type(), const allocator_type& alloc = allocator_type());
C++11
vector (size_type n, const value_type& val, const allocator_type& alloc = allocator_type()); explicit vector (size_type n);
Parameters
n − Size of container.
val − Value to be assigned to each element of container.
Return value
Constructor never returns value.
Exceptions
This member function never throws exception.
Time complexity
Linear i.e. O(n)
Example
The following example shows the usage of fill constructor std::vector::vector().
#include <iostream> #include <vector> using namespace std; int main(void) { vector<int> v(5, 200); for (int i = 0; i < v.size(); ++i) cout << v[i] << endl; return 0; }
Let us compile and run the above program, this will produce the following result −
200 200 200 200 200
vector.htm
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