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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:extent extent]
- template <class T, std::size_t N = 0>
- struct extent : public __integral_constant<std::size_t, EXTENT(T,N)> {};
-
- __inherit Class template extent inherits from `__integral_constant<std::size_t, EXTENT(T,N)>`,
- where `EXTENT(T,N)` is the number of elements in the N'th array dimension of type `T`.
- If `T` is not a (built-in) array type, or if `N > __rank<T>::value`, or if the N'th array bound
- is incomplete, then `EXTENT(T,N)` is zero.
- __header ` #include <boost/type_traits/extent.hpp>` or ` #include <boost/type_traits.hpp>`
- __examples
- [:`extent<int[1]>` inherits from `__integral_constant<std::size_t, 1>`.]
- [:`extent<double[2][3][4], 0>::type` is the type `__integral_constant<std::size_t, 2>`.]
- [:`extent<double[2][3][4], 1>::type` is the type `__integral_constant<std::size_t, 3>`.]
- [:`extent<double[2][3][4], 2>::type` is the type `__integral_constant<std::size_t, 4>`.]
- [:`extent<int[4]>::value` is an integral constant
- expression that evaluates to /4/.]
- [:`extent<int[][2]>::value` is an integral constant
- expression that evaluates to /0/.]
- [:`extent<int[][2], 1>::value` is an integral constant
- expression that evaluates to /2/.]
- [:`extent<int*>::value` is an integral constant
- expression that evaluates to /0/.]
- [:`extent<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]!]
- [:`extent<T>::value_type` is the type `std::size_t`.]
- [all_compilers]
- [endsect]
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