More documentation.

doc/mp11/integer_sequence.qbk

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+[/
+ /  Copyright 2017 Peter Dimov
+ /
+ / 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:integer_sequence Integer Sequences, `<boost/integer_sequence.hpp>`]
+
+The contents of this header are defined in namespace `boost`.
+
+[section `integer_sequence<T, I...>`]
+    template<class T, T... I> struct integer_sequence
+    {
+    };
+
+`integer_sequence<T, I...>` holds a sequence of integers of type `T`. Same as C++14's `std::integer_sequence`.
+[endsect]
+
+[section `make_integer_sequence<T, N>`]
+    template<class T, T N> using make_integer_sequence = /*...*/;
+
+`make_integer_sequence<T, N>` is `integer_sequence<T, 0, 1, ..., N-1>`. Same as C++14's `std::make_integer_sequence`.
+[endsect]
+
+[section `index_sequence<I...>`]
+    template<std::size_t... I> using index_sequence = integer_sequence<std::size_t, I...>;
+
+`index_sequence<I...>` is an alias for `integer_sequence<size_t, I...>`. Same as C++14's `std::index_sequence`.
+[endsect]
+
+[section `make_index_sequence<N>`]
+    template<std::size_t N> using make_index_sequence = make_integer_sequence<std::size_t, N>;
+
+`make_index_sequence<N>` is `index_sequence<0, 1, ..., N-1>`. Same as C++14's `std::make_index_sequence`.
+[endsect]
+
+[section `index_sequence_for<T...>`]
+    template<class... T> using index_sequence_for = make_integer_sequence<std::size_t, sizeof...(T)>;
+
+`index_sequence_for<N>` is `make_index_sequence<sizeof...(T)>`. Same as C++14's `std::index_sequence_for`.
+[endsect]
+
+[endsect]