tmp/tmpa7ih6siu/{from.md → to.md}
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### In general <a id="intseq.general">[[intseq.general]]</a>
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The library provides a class template that can represent an integer
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sequence. When used as an argument to a function template the parameter
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pack defining the sequence can be deduced and used in a pack expansion.
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``` cpp
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template<class F, class Tuple, std::size_t... I>
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decltype(auto) apply_impl(F&& f, Tuple&& t, index_sequence<I...>) {
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return std::forward<F>(f)(std::get<I>(std::forward<Tuple>(t))...);
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}
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template<class F, class Tuple>
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decltype(auto) apply(F&& f, Tuple&& t) {
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using Indices = make_index_sequence<std::tuple_size<std::decay_t<Tuple>>::value>;
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return apply_impl(std::forward<F>(f), std::forward<Tuple>(t), Indices());
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}
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```
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The `index_sequence` alias template is provided for the common case of
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an integer sequence of type `size_t`.
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