Namespace
Varianti

std::tuple_size(std::array)

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< cpp‎ | container‎ | array

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C++
 
Contenitori libreria
 
std::array
Membri funzioni
Original:
Member functions
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Elemento accesso
Original:
Element access
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array::at
array::operator[]
array::front
array::back
array::data
Iteratori
Original:
Iterators
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array::begin
array::cbegin
array::end
array::cend
array::rbegin
array::crbegin
array::rend
array::crend
Capacità
Original:
Capacity
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array::empty
array::size
array::max_size
Modificatori
Original:
Modifiers
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array::fill
array::swap
Non membri funzioni
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Non-member functions
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get
swap
Helper classi
Original:
Helper classes
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tuple_size
tuple_element
 
Elemento definito nell'header <array>
template< class T, size_t N >

class tuple_size< array<T, N> > :
    public integral_constant<size_t, N>

{ };
 (1) (dal C++11)
Consente di accedere al numero di elementi in un std::array come un tempo di compilazione espressione costante.
Original:
Provides access to the number of elements in an std::array as a compile-time constant expression.
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Indice

Inherited from std::integral_constant

Member constants

value
[statico]
 N, the number of elements in the array
(pubblico membro statico costante)

Member functions

operator std::size_t
converte l'oggetto in std::size_t, restituisce value
Original:
converts the object to std::size_t, returns value
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(metodo pubblico)

Member types

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

[modifica] Esempio

#include <iostream>
#include <array>
 
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';
}
 
int main()
{
    std::array<float, 3> arr;
    test(arr);
}

Output: 

3

[modifica] Vedi anche
ottiene la dimensione della tuple al momento della compilazione
Original:
obtains the size of tuple at compile time
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(classe modello di specializzazione) [modifica]
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