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std::tuple_size(std::span)

Defined in header <span>

Defined in header `<span>`
template< class T, std::size_t N > class tuple_size< std::span<T, N> > : public std::integral_constant<std::size_t, N> { };	(1)	(since C++20)
template< class T > class tuple_size< std::span<T, std::dynamic_extent> >; // Not defined	(2)	(since C++20)

template< class T, std::size_t N >
class tuple_size< std::span<T, N> > :
    public std::integral_constant<std::size_t, N>
{ };

(1)

(since C++20)

template< class T >
class tuple_size< std::span<T, std::dynamic_extent> >; // Not defined

(2)

(since C++20)

Provides access to the number of elements in a static-extent span as a compile-time constant expression. If the span has dynamic extent, the tuple_size specialization is an incomplete type.

Inherited from std::integral_constant

Member constants

value

[static]

N, the number of elements in the span
(public static member constant)

Member functions

operator std::size_t	converts the object to `std::size_t`, returns `value` (public member function)
operator() (C++14)	returns `value` (public member function)

Member types

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