2.2 KiB
[intseq]
21 Metaprogramming library [meta]
21.2 Compile-time integer sequences [intseq]
21.2.1 General [intseq.general]
The library provides a class template that can represent an integer sequence.
When used as an argument to a function template the template parameter pack defining the sequence can be deduced and used in a pack expansion.
[Note 1:
The index_sequence alias template is provided for the common case of an integer sequence of type size_t; see also [tuple.apply].
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21.2.2 Class template integer_sequence [intseq.intseq]
namespace std {template<class T, T... I> struct integer_sequence {using value_type = T; static constexpr size_t size() noexcept { return sizeof...(I); }};}
Mandates: T is an integer type.
21.2.3 Alias template make_integer_sequence [intseq.make]
template<class T, T N> using make_integer_sequence = integer_sequence<T, see below>;
Mandates: N ⥠0.
The alias templatemake_integer_sequence denotes a specialization ofinteger_sequence with N constant template arguments.
The type make_integer_sequence<T, N> is an alias for the typeinteger_sequence<T, 0, 1, …, N - 1>.
[Note 1:
make_integer_sequence<int, 0> is an alias for the typeinteger_sequence.
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