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std::tuple_size<std::tuple>

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< cpp‎ | utility‎ | tuple

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C++
 
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
(C++11)
(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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(C++11)
(C++11)
(C++11)
Troque, avançar e avançar
Original:
Swap, forward and move
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(C++11)
(C++11)
(C++11)
(C++11)
 
std::tuple
Funções de membro
Original:
Member functions
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tuple::tuple
tuple::operator=
tuple::swap
Não-membros funções
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Non-member functions
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Classes auxiliares
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Helper classes
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tuple_size
 
Definido no cabeçalho <tuple>
template< class T >
class tuple_size; /*undefined*/
 (1) (desde C++11)
template< class... Types >

class tuple_size<tuple<Types...> >

 : public std::integral_constant<std::size_t, sizeof...(Types)> { };
 (2) (desde C++11)
template< class T >

class tuple_size<const T>
 : public std::integral_constant<
             typename std::remove_cv<decltype(std::tuple_size<T>::value)>::type,

             std::tuple_size<Tp>::value> { };
 (3) (desde C++11)
template< class T >

class tuple_size< volatile T >
 : public std::integral_constant<
             typename std::remove_cv<decltype(std::tuple_size<T>::value)>::type,

             std::tuple_size<Tp>::value> { };
 (4) (desde C++11)
template< class T >

class tuple_size< const volatile T >
 : public std::integral_constant<
             typename std::remove_cv<decltype(std::tuple_size<T>::value)>::type,

             std::tuple_size<Tp>::value> { };
 (5) (desde C++11)
Fornece acesso ao número de elementos de uma tupla como uma expressão constante em tempo de compilação.
Original:
Provides access to the number of elements in a tuple as a compile-time constant expression.
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Índice

Herdado de std::integral_constant

Member constants

value
[estática]
 sizeof...(Types)
(membro estático público constante)

Member functions

operator std::size_t
converte o objeto em std::size_t, retorna value
Original:
converts the object to std::size_t, returns value
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(função pública membro)

Member types

Tipo
Original:
Type
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 Definition
value_type std::size_t
type std::integral_constant<std::size_t, value>

[editar] Exemplo

#include <iostream>
#include <tuple>
 
template<class T>
void test(T t)
{
    int a[std::tuple_size<T>::value]; // can be used at compile time
    std::cout << std::tuple_size<T>::value << '\n'; // or at run time
}
 
int main()
{
    test(std::make_tuple(1, 2, 3.14));
}

Saída: 

3

[editar] Veja também
obtém o tamanho de um array
Original:
obtains the size of an array
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(especialização modelo. classe) [edit]
(C++11)
obtém o tamanho de um pair
Original:
obtains the size of a pair
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(especialização modelo. classe) [edit]
tupla acessa elemento especificado
Original:
tuple accesses specified element
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(modelo de função) [edit]
obtém o tipo do elemento especificado
Original:
obtains the type of the specified element
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(especialização modelo. classe) [edit]
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