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std::numeric_limits

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numeric_limits
C numérico limita interface
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(C++11)
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Type trait constants
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integral_constant(C++11)
 
std::numeric_limits
 
Defined in header <limits>
template< class T > class numeric_limits;
O modelo de classe numeric_limits fornece uma maneira padronizada para consultar várias propriedades de tipos fundamentais (por exemplo, o maior valor possível para o tipo int é std::numeric_limits<int>::max()).
Original:
The numeric_limits class template provides a standardized way to query various properties of fundamental types (e.g. the largest possible value for type int is std::numeric_limits<int>::max()).
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Esta informação é fornecida através de especializações do molde numeric_limits. A biblioteca padrão faz especializações disponíveis para todos os tipos fundamentais:
Original:
This information is provided via specializations of the numeric_limits template. The standard library makes available specializations for all fundamental types:
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Defined in header <limits>
template<> class numeric_limits<bool>;

template<> class numeric_limits<char>;
template<> class numeric_limits<signed char>;
template<> class numeric_limits<unsigned char>;
template<> class numeric_limits<wchar_t>;
template<> class numeric_limits<char16_t>;   // C++11 feature
template<> class numeric_limits<char32_t>;   // C++11 feature
template<> class numeric_limits<short>;
template<> class numeric_limits<unsigned short>;
template<> class numeric_limits<int>;
template<> class numeric_limits<unsigned int>;
template<> class numeric_limits<long>;
template<> class numeric_limits<unsigned long>;
template<> class numeric_limits<long long>;
template<> class numeric_limits<unsigned long long>;
template<> class numeric_limits<float>;
template<> class numeric_limits<double>;

template<> class numeric_limits<long double>;
Além disso, existe uma especialização para cada versão cv qualificado de cada tipo fundamental, idêntica à especialização sem ressalvas, por exemplo, std::numeric_limits<const int>, std::numeric_limits<volatile int> e std::numeric_limits<const volatile int> são fornecidos e são equivalentes ao std::numeric_limits<int>.
Original:
Additionally, a specialization exists for every cv-qualified version of each fundamental type, identical to the unqualified specialization, e.g. std::numeric_limits<const int>, std::numeric_limits<volatile int>, and std::numeric_limits<const volatile int> are provided and are equivalent to std::numeric_limits<int>.
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O padrão de tipos de bibliotecas que são aliases de tipos fundamentais (como std::size_t ou std::streamsize também pode ser examinado com as características de tipo std::numeric_limits.
Original:
The standard library types that are aliases of fundamental types (such as std::size_t or std::streamsize may also be examined with the std::numeric_limits type traits.
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Implementações podem fornecer especializações de std::numeric_limits para implementação tipos específicos: por exemplo. GCC. Fornece std::numeric_limits<__int128> bibliotecas podem adicionar especializações para biblioteca fornecidos tipos, por exemplo, dispõe OpenEXR std::numeric_limits<half> para um 16-bit tipo de ponto flutuante.
Original:
Implementations may provide specializations of std::numeric_limits for implementation-specific types: e.g. GCC provides std::numeric_limits<__int128>. Libraries may add specializations for library-provided types, e.g. OpenEXR provides std::numeric_limits<half> for a 16-bit floating-point type.
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Índice

[editar] Constantes de membros

[estática]
identifica os tipos para que std::numeric_limits se especializou
Original:
identifies types for which std::numeric_limits is specialized
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(membro estático público constante) [edit]
[estática]
identifica os tipos assinados
Original:
identifies signed types
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(membro estático público constante) [edit]
[estática]
identifica os tipos inteiros
Original:
identifies integer types
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(membro estático público constante) [edit]
[estática]
identifica os tipos de exatas
Original:
identifies exact types
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(membro estático público constante) [edit]
[estática]
identifica tipos de ponto flutuante que pode representar o valor especial "infinito positivo"
Original:
identifies floating-point types that can represent the special value "positive infinity"
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(membro estático público constante) [edit]
[estática]
identifica tipos de ponto flutuante que podem representar o valor especial "tranquila, não-número um" (NaN)
Original:
identifies floating-point types that can represent the special value "quiet not-a-number" (NaN)
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(membro estático público constante) [edit]
identifica tipos de ponto flutuante que podem representar o valor especial "de sinalização não-número um" (NaN)
Original:
identifies floating-point types that can represent the special value "signaling not-a-number" (NaN)
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(membro estático público constante) [edit]
[estática]
identifica o estilo desnormalização usado pelo tipo de ponto flutuante
Original:
identifies the denormalization style used by the floating-point type
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(membro estático público constante) [edit]
[estática]
identifies the floating-point types that detect loss of precision as denormalization loss rather than inexact result
(membro estático público constante) [edit]
[estática]
identifica o estilo arredondamento usado pelo tipo
Original:
identifies the rounding style used by the type
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(membro estático público constante) [edit]
[estática]
identifica os IEC 559/IEEE 754 tipos de ponto flutuante
Original:
identifies the IEC 559/IEEE 754 floating-point types
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(membro estático público constante) [edit]
[estática]
identifies types that represent a finite set of values
(membro estático público constante) [edit]
[estática]
identifica os tipos que lidam com transborda com a aritmética módulo
Original:
identifies types that handle overflows with modulo arithmetic
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(membro estático público constante) [edit]
[estática]
número de dígitos radix que podem ser representadas sem alterações
Original:
number of radix digits that can be represented without change
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(membro estático público constante) [edit]
[estática]
número de dígitos decimais que podem ser representadas sem alterações
Original:
number of decimal digits that can be represented without change
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(membro estático público constante) [edit]
[estática] (C++11)
número de dígitos decimais necessários para diferenciar os valores deste tipo
Original:
number of decimal digits necessary to differentiate all values of this type
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(membro estático público constante) [edit]
[estática]
a raiz ou base inteiro usado pela representação do tipo de dado
Original:
the radix or integer base used by the representation of the given type
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(membro estático público constante) [edit]
[estática]
mais um do que o menor poder negativo do radix que é um valor válido de ponto flutuante normalizado
Original:
one more than the smallest negative power of the radix that is a valid normalized floating-point value
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(membro estático público constante) [edit]
[estática]
a menor potência negativa de 10 que é um valor válido de ponto flutuante normalizado
Original:
the smallest negative power of ten that is a valid normalized floating-point value
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(membro estático público constante) [edit]
[estática]
um a mais que o maior poder inteiro da raiz que é um valor válido de ponto flutuante finita
Original:
one more than the largest integer power of the radix that is a valid finite floating-point value
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(membro estático público constante) [edit]
[estática]
a maior potência inteira de 10 que é um válido valor de ponto flutuante finita
Original:
the largest integer power of 10 that is a valid finite floating-point value
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(membro estático público constante) [edit]
[estática]
identifica os tipos que podem causar operações aritméticas para prender
Original:
identifies types which can cause arithmetic operations to trap
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(membro estático público constante) [edit]
[estática]
identifica tipos de ponto flutuante que detectam tinyness antes de arredondamentos
Original:
identifies floating-point types that detect tinyness before rounding
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(membro estático público constante) [edit]

[editar] Funções de membro

[estática]
retorna o menor valor finito do tipo de dado
Original:
returns the smallest finite value of the given type
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(função public static membro) [edit]
[estática] (C++11)
retorna o menor valor finito do tipo de dado
Original:
returns the lowest finite value of the given type
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(função public static membro) [edit]
[estática]
retorna o maior valor finito do tipo de dado
Original:
returns the largest finite value of the given type
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(função public static membro) [edit]
[estática]
retorna a diferença entre 1.0 eo próximo valor representável do dado tipo de ponto flutuante
Original:
returns the difference between 1.0 and the next representable value of the given floating-point type
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(função public static membro) [edit]
[estática]
retorna o erro de arredondamento máximo do dado tipo de ponto flutuante
Original:
returns the maximum rounding error of the given floating-point type
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(função public static membro) [edit]
[estática]
retorna o valor infinito positivo do dado tipo de ponto flutuante
Original:
returns the positive infinity value of the given floating-point type
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(função public static membro) [edit]
[estática]
retorna um valor NaN tranquila do determinado tipo de ponto flutuante
Original:
returns a quiet NaN value of the given floating-point type
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(função public static membro) [edit]
[estática]
retorna um valor NaN sinalização do dado tipo de ponto flutuante
Original:
returns a signaling NaN value of the given floating-point type
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(função public static membro) [edit]
[estática]
retorna o menor valor positivo subnormal do dado tipo de ponto flutuante
Original:
returns the smallest positive subnormal value of the given floating-point type
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(função public static membro) [edit]

[editar] Classes auxiliares

indica os modos de ponto flutuante de arredondamento
Original:
indicates floating-point rounding modes
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(enum) [edit]
indica os modos de ponto flutuante desnormalização
Original:
indicates floating-point denormalization modes
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(enum) [edit]

[editar] Relacionamento com constantes C biblioteca de macro

Specialization Members
min() lowest()
(C++11)
max() epsilon() digits digits10 min_exponent min_exponent10 max_exponent max_exponent10 radix
numeric_limits< bool > 2
numeric_limits< char > CHAR_MIN CHAR_MIN CHAR_MAX 2
numeric_limits< signed char > SCHAR_MIN SCHAR_MIN SCHAR_MAX 2
numeric_limits< unsigned char > 0 0 UCHAR_MAX 2
numeric_limits< wchar_t > WCHAR_MIN WCHAR_MIN WCHAR_MAX 2
numeric_limits< char16_t > 0 0 UINT_LEAST16_MAX 2
numeric_limits< char32_t > 0 0 UINT_LEAST32_MAX 2
numeric_limits< short > SHRT_MIN SHRT_MIN SHRT_MAX 2
numeric_limits< signed short >
numeric_limits< unsigned short > 0 0 USHRT_MAX 2
numeric_limits< int > INT_MIN INT_MIN INT_MAX 2
numeric_limits< signed int >
numeric_limits< unsigned int > 0 0 UINT_MAX 2
numeric_limits< long > LONG_MIN LONG_MIN LONG_MAX 2
numeric_limits< signed long >
numeric_limits< unsigned long > 0 0 ULONG_MAX 2
numeric_limits< long long > LLONG_MIN LLONG_MIN LLONG_MAX 2
numeric_limits< signed long long >
numeric_limits< unsigned long long > 0 0 ULLONG_MAX 2
numeric_limits< float > FLT_MIN -FLT_MAX FLT_MAX FLT_EPSILON FLT_MANT_DIG FLT_DIG FLT_MIN_EXP FLT_MIN_10_EXP FLT_MAX_EXP FLT_MAX_10_EXP FLT_RADIX
numeric_limits< double > DBL_MIN -DBL_MAX DBL_MAX DBL_EPSILON DBL_MANT_DIG DBL_DIG DBL_MIN_EXP DBL_MIN_10_EXP DBL_MAX_EXP DBL_MAX_10_EXP FLT_RADIX
numeric_limits< long double > LDBL_MIN -LDBL_MAX LDBL_MAX LDBL_EPSILON LDBL_MANT_DIG LDBL_DIG LDBL_MIN_EXP LDBL_MIN_10_EXP LDBL_MAX_EXP LDBL_MAX_10_EXP FLT_RADIX

[editar] Exemplo

#include <limits>
#include <iostream>
 
int main() 
{
    std::cout << "type\tlowest\thighest\n";
    std::cout << "int\t"
              << std::numeric_limits<int>::lowest() << '\t'
              << std::numeric_limits<int>::max() << '\n';
    std::cout << "float\t"
              << std::numeric_limits<float>::lowest() << '\t'
              << std::numeric_limits<float>::max() << '\n';
    std::cout << "double\t"
              << std::numeric_limits<double>::lowest() << '\t'
              << std::numeric_limits<double>::max() << '\n';
}

Possible output:

type    lowest         highest
int     -2147483648    2147483647
float   -3.40282e+38   3.40282e+38
double  -1.79769e+308  1.79769e+308