In almost any useful program, the values of variables are constantly being copied, even when we don’t realize it. In this chapter, we’ll examine the causes and the possible consequences of copying. This topic might seem trivial, but copying can have hidden costs that can prove problematic when it’s not clear that a section of code is making copies.
We’ll explore the following:
Why knowing whether a value is a copy is vital to understanding a program
How to avoid copying values in certain circumstances
Where the compiler may be making hidden copies of values
What we can do to prevent the need for the compiler ...
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