What is the C++11 vector reserve function?
An example of an AI chatbot conversation about C++11 vector reserve function usage.
Can you explain the reserve function in C++11 vectors?
Sure! The reserve function in C++11 is used to preallocate memory for a vector, which can improve performance by reducing the number of reallocations.
How does it differ from resize?
While reserve allocates memory without changing the size of the vector, resize actually changes the size and initializes new elements if the new size is larger.
When should I use reserve?
You should use reserve when you know the number of elements you will need in advance, to optimize memory allocation.
Can you give me a code example?
Certainly! Here's a simple example:
std::vector<int> vec;
vec.reserve(10); // reserves space for 10 integers
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