c_cpp 数组与矢量C ++

Posted 2021-05-14

# Defining and initializing vectors

vector<T> v1; // vector that holds object of type T, default constructor v1 is empty

vector<T> v2 (v1); // v2 is a copy of v1

vector<T> v3(n, i); // v2 has n elements with value i

vector<T> v4(n); // v4 has n copies of a value-initialized object

# The size of a vector
vector<int>::size_type

vector<int> v;

for (vector<int>::size_type ix = 0; ix != 10; ++ix) {
    // v[ix] = ix; // wrong
    v.push_back(ix);
}

# Iterator

vector<int> v(10, 1);

for (vector<int>::iterator iter = v.begin(); iter != v.end(); ++iter) {
    cout << *iter << endl;
}