std::nan, std::nanf, std::nanl - cppreference.com
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      std::nan, std::nanf, std::nanl

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      Generic numeric operations
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      <tbody> </tbody>
      Definido no cabeçalho <cmath>
      float nanf( const char* arg );
      		 (desde C++11)
      double nan( const char* arg );
      		 (desde C++11)
      long double nanl( const char* arg );
      		 (desde C++11)
      Converte a aplicação definida arg seqüência de caracteres para o valor correspondente NaN silencioso. O std::nan("string") chamada é equivalente ao std::strtod("NAN(string)", (char**)NULL); chamada.
      Original:
      Converts the implementation-defined character string arg into the corresponding quiet NaN value. The call std::nan("string") is equivalent to the call std::strtod("NAN(string)", (char**)NULL);.
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      Parâmetros

      arg -
      cadeia de caracteres estreita identificar o conteúdo de um NaN, ou uma string vazia
      Original:
      narrow character string identifying the contents of a NaN, or an empty string
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      Valor de retorno

      O valor NaN que corresponde ao arg string de identificação ou zero se a implementação não suporta NaNs tranquilos.
      Original:
      The NaN value that corresponds to the identifying string arg or zero if the implementation does not support quiet NaNs.
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