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C++ Fundamentals for Professionals

- Solution

Explore how to manage and optimize the capacity of C++ vectors using the shrink_to_fit function. This lesson explains vector initialization, capacity changes, and memory efficiency techniques, preparing you for further study of sequential containers like deques.

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Solution #

C++ 17
#include <iostream>
#include <vector>
int main(){
  std::cout << std::endl;
  std::vector<int> intVec1(5, 2011);
  intVec1.reserve(10);
  std::cout << "intVec1.size(): " << intVec1.size() << std::endl;
  std::cout << "intVec1.capacity(): " << intVec1.capacity() << std::endl;
  intVec1.shrink_to_fit();
  std::cout << "intVec1.capacity(): " << intVec1.capacity() << std::endl;
  
  std::cout << std::endl;
  
  std::vector<int> intVec2(10);
  std::cout << "intVec2.size() : " << intVec2.size() << std::endl;
  std::vector<int> intVec3{10};
  std::cout << "intVec3.size() : " << intVec3.size() << std::endl;
  std::vector<int> intVec4{5, 2011};
  std::cout << "intVec4.size() : " << intVec4.size() << std::endl;
  std::cout << std::endl;
  
}
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