What is the function of the '->' in that line?

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The '->' operator is used in C++ to access members of a class or structure through a pointer. In the example "pTerm = pid->pGain * error;", 'pid' is a pointer to a class or structure, and 'pGain' is a member of that class or structure. The expression 'pid->pGain' is functionally equivalent to dereferencing the pointer with '(*pid).pGain', but the '->' operator provides a cleaner syntax. This operator simplifies code readability and reduces the potential for errors when accessing member variables. Understanding the '->' operator is essential for working with pointers in C++.
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I was going through a bit of open source code when I came upon this line
"pTerm = pid->pGain * error;"

What is the function of the '->' in that line?
 
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pid is a pointer to a class or structure.
pGain is a member of the class or structure.
pid -> pGain means the same as (*pid).pGain (but it looks prettier).
 

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