std::rank
Defined in header <type_traits>
|
||
template< class T > struct rank; |
(since C++11) | |
If T
is an array type, provides the member constant value
equal to the number of dimensions of the array. For any other type, value
is 0.
Helper variable template
template< class T > inline constexpr std::size_t rank_v = rank<T>::value; |
(since C++17) | |
Inherited from std::integral_constant
Member constants
value [static] |
the number of dimensions of T or zero (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> |
Possible implementation
template<class T> struct rank : public std::integral_constant<std::size_t, 0> {}; template<class T> struct rank<T[]> : public std::integral_constant<std::size_t, rank<T>::value + 1> {}; template<class T, std::size_t N> struct rank<T[N]> : public std::integral_constant<std::size_t, rank<T>::value + 1> {}; |
Example
Run this code
Output:
0 1 2 3
See also
(C++11) |
checks if a type is an array type (class template) |
(C++11) |
obtains the size of an array type along a specified dimension (class template) |
(C++11) |
removes one extent from the given array type (class template) |
(C++11) |
removes all extents from the given array type (class template) |