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      std::atomic::fetch_sub

      De cppreference.com

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      <metanoindex/>

       
      C++
       
      Biblioteca operações atômica
      Tipos
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      Types
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      (C++11)
      (C++11)
      Funções
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      Functions
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      (C++11)(C++11)
      (C++11)(C++11)
      (C++11)(C++11)
      (C++11)(C++11)(C++11)(C++11)
      (C++11)(C++11)
      (C++11)(C++11)
      (C++11)(C++11)
      (C++11)(C++11)
      (C++11)(C++11)
      Bandeiras atômicas
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      Atomic flags
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      (C++11)
      (C++11)(C++11)
      (C++11)(C++11)
      Inicialização
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      Initialization
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      Memória de encomenda
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      Memory ordering
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      (C++11)
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      std::atomic
      Funções de membro
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      Member functions
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      atomic::atomic
      atomic::operator=
      atomic::is_lock_free
      atomic::store
      atomic::load
      atomic::operator T
      atomic::exchange
      atomic::compare_exchange
      Membro funções especializadas
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      Specialized member functions
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      atomic::fetch_add
      atomic::fetch_sub
      atomic::fetch_and
      atomic::fetch_or
      atomic::fetch_xor
      atomic::operator++
      atomic::operator++(int)
      atomic::operator--
      atomic::operator--(int)
      atomic::operator+=
      atomic::operator-=
      atomic::operator&=
      atomic::operator|=
      atomic::operator^=
       
      <tbody> </tbody>
      T fetch_sub( T arg, memory_order = std::memory_order_seq_cst ); T fetch_sub( T arg, memory_order = std::memory_order_seq_cst ) volatile;
      		 (único membro da atomic<Integral> especialização modelo)
      (desde C++11)
      T* fetch_sub( std::ptrdiff_t arg, memory_order = std::memory_order_seq_cst ); T* fetch_sub( std::ptrdiff_t arg, memory_order = std::memory_order_seq_cst ) volatile;
      		 (único membro da atomic<T*> especialização modelo)
      (desde C++11)
      Atomicamente substitui o valor da corrente com o resultado de operações aritméticas subtracção do valor e arg. A operação é ler-modificar-escrever a operação. A memória é afectada de acordo com o valor de memory_order.
      Original:
      Atomically replaces the current value with the result of arithmetic subtraction of the value and arg. The operation is read-modify-write operation. Memory is affected according to the value of memory_order.
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      Para os tipos de Integral assinados, a aritmética é definida para usar dois representação de complemento. Lá
      Original:
      For signed Integral types, arithmetic is defined to use two’s complement representation. There
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      há resultados indefinidos. Para os tipos de T*, o resultado pode ser um endereço indefinido, mas as operações de outra forma não têm um comportamento indefinido.
      Original:
      are no undefined results. For T* types, the result may be an undefined address, but the operations otherwise have no undefined behavior.
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      Parâmetros

      arg -
      o outro argumento de subtração aritmética
      Original:
      the other argument of arithmetic subtraction
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      memory_order -
      restrições de ordem memória de aplicar
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      memory order constraints to enforce
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      Valor de retorno

      O valor da variável atómica antes da chamada.
      Original:
      The value of the atomic variable before the call.
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      Exceções

      noexcept specification:  
      <tbody> </tbody>
      noexcept
        (desde C++11)

      Veja também

      (C++11)
      (C++11)
      subtrai um valor não atômica de um objeto atômico e obtém o valor anterior do nuclear
      Original:
      subtracts a non-atomic value from an atomic object and obtains the previous value of the atomic
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      (modelo de função) [edit]