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std::chrono::duration::duration

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< cpp‎ | chrono‎ | duration

 
 
Biblioteca de utilitários
Digite apoio (basic types, RTTI, type traits)
Gerenciamento de memória dinâmica
De tratamento de erros
Utilidades do programa
Variadic funções
Data e hora
Objetos de função
initializer_list(C++11)
bitset
hash(C++11)
Os operadores relacionais
Original:
Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
Pares e tuplas
Original:
Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
Troque, avançar e avançar
Original:
Swap, forward and move
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swap
forward(C++11)
move(C++11)
move_if_noexcept(C++11)
declval(C++11)
 
 
std::chrono::duration
Funções de membro
Original:
Member functions
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duration::duration
duration::operator=
duration::count
duration::zero
duration::min
duration::max
duration::operator+
duration::operator-
duration::operator++
duration::operator--
duration::operator+=
duration::operator-=
duration::operator*=
duration::operator/=
duration::operator%=
Não-membros funções
Original:
Non-member functions
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common_type
operator+
operator-
operator*
operator/
operator%
operator==
operator!=
operator<
operator<=
operator>
operator>=
duration_cast
Classes auxiliares
Original:
Helper classes
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treat_as_floating_point
duration_values
 
constexpr duration() = default;
(1)
duration(const duration&) = default;
(2)
template <class Rep2>
constexpr explicit duration(const Rep2& r);
(3)
template <class Rep2, class Period2>
constexpr duration(const duration<Rep2, Period2>& d);
(4)
Constrói um novo duration de uma das várias fontes de dados opcionais.
Original:
Constructs a new duration from one of several optional data sources.
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1)
O construtor padrão é padrão.
Original:
The default constructor is defaulted.
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2)
O construtor de cópia é padrão (faz uma cópia bit a bit da contagem de carrapatos).
Original:
The copy constructor is defaulted (makes a bitwise copy of the tick count).
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3)
Constrói uma duração de carrapatos r. Note-se que este construtor só participa na resolução de sobrecarga se Rep2 (o tipo de argumento) é implicitamente conversível para rep (o tipo de carrapatos esta duração) e
Original:
Constructs a duration with r ticks. Note that this constructor only participates in overload resolution if Rep2 (the argument type) is implicitly convertible to rep (the type of this duration's ticks) and
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@ @ (Ou seja, uma duração com uma contagem de escala inteiro não pode ser construído a partir de um valor de ponto flutuante, mas com uma duração de uma contagem de escala de ponto flutuante pode ser construído a partir de um valor inteiro)
Original:
@@(that is, a duration with an integer tick count cannot be constructed from a floating-point value, but a duration with a floating-point tick count can be constructed from an integer value)
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4)
Constrói uma duração convertendo d a um período adequado e contagem de carrapatos, como se por std::chrono::duration_cast<duration>(d).count(). A fim de evitar o truncamento durante a conversão, este construtor só participa na resolução de sobrecarga, se:
Original:
Constructs a duration by converting d to an appropriate period and tick count, as if by std::chrono::duration_cast<duration>(d).count(). In order to prevent truncation during conversion, this constructor only participates in overload resolution if:
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@ @ Ou ambos:
Original:
@@ or both:
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@ @ (Isto é, tanto a duração usa ponto flutuante carrapatos, ou Period2 é exatamente divisível por período)
Original:
@@ (that is, either the duration uses floating-point ticks, or Period2 is exactly divisible by period)
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[editar] Parâmetros

r -
uma contagem de carrapatos
Original:
a tick count
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d -
uma duração para copiar
Original:
a duration to copy from
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[editar] Exemplo

O código a seguir mostra vários exemplos (ambos válidos e inválidos) de como construir durações:
Original:
The following code shows several examples (both valid and invalid) of how to construct durations:
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#include <chrono>
int main()
{
    std::chrono::hours h(1); // one hour
    std::chrono::milliseconds ms{3}; // 3 milliseconds
    std::chrono::duration<int, std::kilo> ks(3); // 3000 seconds
 
    // error: treat_as_floating_point<int>::value == false,
    // This duration allows whole tick counts only
//  std::chrono::duration<int, std::kilo> d3(3.5);
 
    // 30Hz clock using fractional ticks
    std::chrono::duration<double, std::ratio<1, 30>> hz30(3.5);
 
    // 3000 microseconds constructed from 3 milliseconds
    std::chrono::microseconds us = ms;
    // error: 1/1000000 is not divisible by 1/1000
//  std::chrono::milliseconds ms2 = us
}


[editar] Veja também

atribui o conteúdo
Original:
assigns the contents
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(função pública membro) [edit]