What is the use of volatile member function

Answer 1

Volatile qualifier forces the compiler to ignore some regular optimization in your code. See the full description here [https://www.sololearn.com/Discuss/701288/c-bread-butter-part-2-1] section: coffee break.

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Answer 2

It means that the function will not be optimized (content not modified)
For asm call, you do not want the compiler to change your asm code, so you'll need volatile