Allocate memory for a vector [closed]

Answer 1

Take a look at this You use list.reserve(n);

Vector takes care of its memory, and you shouldn't really need to use reserve() at all. Its only really a performance improvement if you already know how large the vector list needs to be.

For example:

std::vector v;
v.reserve(110); // Not required, but improves initial loading performance

// Fill it with data
for(int n=0;n < 100; n++)
    v.push_back(n);

// Display the data
std::vector::iterator it;
for(it = v.begin(); it != v.end(); ++it)
    cout << *it;