What is the volatile c++ keyword?

Question

Brian · Accepted Answer

"Answer: It's compiler hint, asking the compiler not to optimized away the labeled variable," is only a half answer. 

Volatile tells the program a value can be changed at any time, so it can't cache the value. It forces the program to retrieve the value from memory. Concerning it's use and possible uses, things can get complex in C++.

Anonymous · Answer

It is useful in multithreading, when semaphores are needed, and multiple threads affect the value. It ensures that the most up to date value is loaded in.

Anonymous · Answer

The other questions were reasonable programming and math questions, but that one struck me as random trivia question.  Answer:  It's compiler hint, asking the compiler not to optimized away the labeled variable.

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