std::isunordered - cppreference.com
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      std::isunordered

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      C++
       
      Biblioteca numéricos
      Funções matemáticas comuns
      De ponto flutuante ambiente
      Números complexos
      Matrizes numéricas
      Pseudo-aleatório de geração de números
      Tempo de compilação aritmética racional (C++11)
      Genéricos operações numéricas
      Original:
      Generic numeric operations
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      (C++11)
       
      Funções matemáticas comuns
      Funções
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      Functions
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      Operações básicas
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      Basic operations
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      (C++11)(C++11)(C++11)
      Funções exponenciais
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      Exponential functions
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      Funções de poder
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      Power functions
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      Funções trigonométricas e hiperbólicas
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      Trigonometric and hyperbolic functions
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      Erro e funções gamma
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      Error and gamma functions
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      (C++11)
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      (C++11)
      Número inteiro mais próximo de operações de ponto flutuante
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      Nearest integer floating point operations
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      (C++11)(C++11)(C++11)
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      (C++11)(C++11)(C++11)
      Flutuando funções de manipulação de pontos
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      Floating point manipulation functions
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      Classificação / Comparação
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      Classification/Comparison
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      (C++11)
      Constantes de macros
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      Macro constants
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      (C++11)(C++11)(C++11)(C++11)(C++11)
       
      <tbody> </tbody>
      Definido no cabeçalho <cmath>
      bool isunordered( float x, float y );
      		 (desde C++11)
      bool isunordered( double x, double y );
      		 (desde C++11)
      bool isunordered( long double x, long double y );
      		 (desde C++11)
      Determina se os números de ponto flutuante e x y são desordenados, ou seja, um ou ambos são NaN e, portanto, não pode ser de forma significativa em comparação com os outros.
      Original:
      Determines if the floating point numbers x and y are unordered, that is, one or both are NaN and thus cannot be meaningfully compared with each other.
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      Parâmetros

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

      true se qualquer x ou y é NaN, false contrário
      Original:
      true if either x or y is NaN, false otherwise
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      Veja também