std::signbit - cppreference.com
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      std::signbit

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      <tbody> </tbody>
      Definido no cabeçalho <cmath>
      bool signbit( float arg );
      		 (desde C++11)
      bool signbit( double arg );
      		 (desde C++11)
      bool signbit( long double arg );
      		 (desde C++11)


      Determina se o dado arg número de ponto flutuante é negativo.
      Original:
      Determines if the given floating point number arg is negative.
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      Parâmetros

      arg -
      flutuando valor de ponto
      Original:
      floating point value
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      Valor de retorno

      true arg se for negativo, false contrário
      Original:
      true if arg is negative, false otherwise
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