Passing by Value and Reference
Explore the different methods of passing arguments to functions in C++. Understand how passing by value creates copies, passing by reference allows modification of the original data, and passing by const reference offers efficiency with safety. This lesson helps you choose the right approach for various data types to write efficient, clear, and professional C++ code.
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Controlling how data moves into functions is one of the most critical decisions we make in C++. Up until now, when we passed a variable to a function, we were making a copy of that value. While this works perfectly for small numbers, it limits our ability to modify the original data and becomes wasteful when dealing with large, complex objects.
To write professional-grade C++, we need to understand when to copy data and when to simply refer to existing data. This lesson introduces references a powerful mechanism that allows us to work directly with the original variables, enabling both performance optimizations and more flexible function designs.
Passing by value
By default, C++ passes arguments by value. This means the function receives a copy of the argument's data, stored in a new, distinct memory location. Any changes made to the parameter inside the function affect only that local copy, leaving the original variable in the caller untouched. ...