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C++ Atomic Library - fetch sub
Description
It atomically subtracts the argument from the value stored in the atomic object and obtains the value held previously.
Declaration
Following is the declaration for std::atomic::fetch_sub.
T fetch_sub( T arg, std::memory_order order = std::memory_order_seq_cst ) volatile;
C++11
T fetch_sub( T arg, std::memory_order order = std::memory_order_seq_cst );
Following is the declaration for std::atomic::fetch_sub(member only of atomic
T* fetch_sub( std::ptrdiff_t arg, std::memory_order order = std::memory_order_seq_cst ) volatile;
C++11
T* fetch_sub( std::ptrdiff_t arg, std::memory_order order = std::memory_order_seq_cst );
Parameters
arg − It is used put the other argument of arithmetic subtraction.
order − It is used enforce the memory order for the value.
Return Value
It returns the value immediately preceding the effects of this function in the modification order of *this.
Exceptions
No-noexcept − this member function never throws exceptions.
atomic.htm
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