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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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