Is this C++ implementation for an Atomic float safe?

Question

Edit: The code here still has some bugs in it, and it could do better in the performance department, but instead of trying to fix this, for t

Answer 1

I strongly doubt that you get the correct values in fetch_and_add etc, as float addition is different from int addition.

Here's what I get from these arithmetics:

1   + 1    =  1.70141e+038  
100 + 1    = -1.46937e-037  
100 + 0.01 =  1.56743e+038  
23  + 42   = -1.31655e-036  

So yeah, threadsafe but not what you expect.

the lock-free algorithms (operator + etc.) should work regarding atomicity (haven't checked for the algorithm itself..)

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Other solution: As it is all additions and subtractions, you might be able to give every thread its own instance, then add the results from multiple threads.