std::shared_future::valid - cppreference.com
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      std::shared_future::valid

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      Biblioteca de suporte a discussão
      Threads
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      Threads
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      this_thread namespace
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      this_thread namespace
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      Exclusão mútua
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      Mutual exclusion
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      Gestão de bloqueio genérico
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      Generic lock management
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      Variáveis ​​de condição
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      Futuros
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      Futures
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      std::shared_future
      Funções de membro
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      Member functions
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      shared_future::shared_future
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      Obtendo o resultado
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      Getting the result
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      shared_future::get
      Estado
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      State
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      shared_future::valid
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      <tbody> </tbody>
      bool valid() const;
      		 (desde C++11)
      Verifica se o futuro se refere a um estado compartilhado com uma promessa. Este é o único caso em futuros retornados por std::promise::get_future(), std::packaged_task::get_future() std::async() ou até que a primeira vez que é chamado get().
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      Checks if the future refers to a state shared with a promise. This is the case only for futures returned by std::promise::get_future(), std::packaged_task::get_future() or std::async() until the first time get() is called.
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      Parâmetros

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      (none)
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      Valor de retorno

      true se * isto se refere a um estado compartilhado, caso contrário false.
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      true if *this refers to a shared state, otherwise false.
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      Exceções

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

      Exemplo

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