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[/
Copyright 2007 John Maddock.
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt).
]
[section:rank rank]
template <class T>
struct rank : public __integral_constant<std::size_t, RANK(T)> {};
__inherit Class template rank inherits from `__integral_constant<std::size_t, RANK(T)>`,
where `RANK(T)` is the number of array dimensions in type `T`.
If `T` is not a (built-in) array type, then `RANK(T)` is zero.
[all_compilers]
__header ` #include <boost/type_traits/rank.hpp>` or ` #include <boost/type_traits.hpp>`
__examples
[:`rank<int[]>` inherits from `__integral_constant<std::size_t, 1>`.]
[:`rank<double[2][3][4]>::type` is the type `__integral_constant<std::size_t, 3>`.]
[:`rank<int[1]>::value` is an integral constant
expression that evaluates to /1/.]
[:`rank<int[][2]>::value` is an integral constant
expression that evaluates to /2/.]
[:`rank<int*>::value` is an integral constant
expression that evaluates to /0/.]
[:`rank<boost::array<int, 3> >::value` is an integral constant
expression that evaluates to /0/: `boost::array` is a class type and [*not an array type]!]
[:`rank<T>::value_type` is the type `std::size_t`.]
[endsect]
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