How to perform basic operations with std::atomic when the type is not Integral?

Question

To be precise, I only need to increase a double by another double and want it to be thread safe. I don\'t want to use mutex for that since the execution speed would dramatically

Answer 1

So use the integral atomic as a memory barrier. Here's a page with source and explanation: http://preshing.com/20121019/this-is-why-they-call-it-a-weakly-ordered-cpu/