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Home » Tip Bank » C++
Language: C++
Expertise: All
Nov 12, 1999



Building the Right Environment to Support AI, Machine Learning and Deep Learning

Avoid Returning Containers by Value

While the overhead of returning an ordinary object by value may be acceptable in most cases, returning a container by value is much more expensive in terms of performance. For example:
  vector <int> f(int n) 
    vector <int> vi(n);
    return vi; //extremely inefficient 
Remember that when you return an object by value from a function, the object copy-constructs itself on the stack. The process of copy-constructing a container consists of copy-constructing its elements one by one
Danny Kalev
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