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std::atomic_ref::fetch_sub(3) C++ Standard Libarystd::atomic_ref::fetch_sub(3) NAME std::atomic_ref::fetch_sub - std::atomic_ref::fetch_sub Synopsis member only of atomic_ref<Integral> and atomic_ref<Floating> tem- plate specializations T fetch_sub( T arg, (1) std::memory_order order = std::memory_order_seq_cst ) const noex- cept; member only of atomic_ref<T*> template specialization T* fetch_sub( std::ptrdiff_t arg, (2) std::memory_order order = std::memory_order_seq_cst ) const noex- cept; Atomically replaces the current value of the referenced object with the result of arithmetic subtraction of the value and arg. This operation is a read-modify-write operation. Memory is affected according to the value of order. For signed integral types, arithmetic is defined to use twos comple- ment representation. There are no undefined results. For floating-point types, the floating-point environment in effect may be different from the calling thread's floating-point environment. The operation need not be conform to the corresponding std::numeric_limits traits but is en- couraged to do so. If the result is not a representable value for its type, the result is unspecified but the operation otherwise has no undefined behavior. For T* types, the result may be an undefined address, but the opera- tion otherwise has no undefined behavior. The program is ill-formed if T is not an object type. Parameters arg - the other argument of arithmetic subtraction order - memory order constraints to enforce Return value The value of the referenced object, immediately preceding the ef- fects of this function. Example This section is incomplete Reason: no example http://cppreference.com 2022.07.31 std::atomic_ref::fetch_sub(3)
NAME | Synopsis | Parameters | Return value | Example
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