What is std::vector::clear() in C++?
Vectors are useful data structures that act like dynamic one-dimensional arrays.
The clear() function is defined in the <vector> library. It is used to delete all the elements in a vector. When the vector is empty, its size becomes zero.
Syntax
myVec.clear()
Parameters
This function takes no parameters.
Return value
The function returns nothing.
The changes are made directly to the vector.
Example
#include <iostream>#include <vector> // first include <vector>using namespace std;int main(){//declaration of int vectorvector<int> vec = {1, 2, 3, 4, 5};// returns length of vector as unsigned intunsigned int vecSize = vec.size();cout << "Before using clear(), size of vector: " << vecSize << endl;// calling clear()vec.clear();// recalculate size of vectorvecSize = vec.size();cout << "After using clear(), size of vector: " << vecSize << endl;cout << endl;return 0;}
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