std::log1p - cppreference.com
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      std::log1p

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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
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      Generic numeric operations
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      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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      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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      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)
      Flutuando funções de manipulação de pontos
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      Floating point manipulation functions
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      Constantes de macros
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      Macro constants
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      <tbody> </tbody>
      Definido no cabeçalho <cmath>
      float log1p( float arg );
      		 (desde C++11)
      double log1p( double arg );
      		 (desde C++11)
      long double log1p( long double arg );
      		 (desde C++11)
      double log1p( Integral arg );
      		 (desde C++11)
      Calcula o natural (base e) logaritmo de 1+arg. Esta função é mais preciso do que a expressão std::log(1+arg) se arg está perto de zero.
      Original:
      Computes the natural (base e) logarithm of 1+arg. This function is more precise than the expression std::log(1+arg) if arg is close to zero.
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      Parâmetros

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

      ln(1+arg)

      Erro de domínio ocorre se arg é negativo. NAN é devolvido em caso.
      Original:
      Domain error occurs if arg is negative. NAN is returned in that case.
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      Faixa de erro ocorre se arg é 0. -HUGE_VAL é devolvido em caso.
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      Range error occurs if arg is 0. -HUGE_VAL is returned in that case.
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