AtomicDoubleFetchAdd

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Description

Implements the same behavior as std::atomic.fetch_add(double Delta), which is only available in c++20. This function will be deprecated and callsites will replace it with std::atomic.fetch_add when versions earlier than c++20 are deprecated.

Atomically adds Delta to Value, using the given MemoryOrder for the ReadModifyWrite of the new value.

double AtomicDoubleFetchAdd  
(  
    std::atomic< double > & Value,  
    double Delta,  
    std::memory_order MemoryOrder  
)  
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double AtomicDoubleFetchAdd (     std::atomic< double > & Value,     double Delta,     std::memory_order MemoryOrder )

The value before the finally successful addition.