Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

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rank

template <class T>
struct rank : public integral_constant<std::size_t, RANK(T)> {};

Inherits: 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 an array type, then RANK(T) is zero.

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<T>::value_type is the type std::size_t.


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