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Document mp_flatten

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Peter Dimov
2019-12-08 03:20:59 +02:00
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doc/mp11/algorithm.adoc
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@ -502,6 +502,26 @@ Removes all elements `T` of `L` for which `mp_to_bool<P<T>>` is `mp_true` and re
As `mp_remove_if`, but takes a quoted metafunction.
## mp_flatten<L>
template<class L, class L2 = mp_clear<L>> using mp_flatten = /*...*/;
Replaces all elements `T` of `L` that are lists of the same form as `L2` (that is, those for which
`mp_similar<T, L2>` is `mp_true`) with their elements and returns the result.
.Using mp_flatten
```
using L1 = tuple<int, tuple<>, void, tuple<float, double>>;
using R1 = mp_flatten<L1>; // tuple<int, void, float, double>
using L2 = mp_list<int, mp_list<float>, tuple<void>>;
using R2a = mp_flatten<L2>; // mp_list<int, float, tuple<void>>
using R2b = mp_flatten<L2, tuple<>>; // mp_list<int, mp_list<float>, void>
using L3 = mp_list<mp_list<float>, mp_list<mp_list<void>>>;
using R3 = mp_flatten<L3>; // mp_list<float, mp_list<void>>
```
## mp_partition<L, P>
template<class L, template<class...> class P> using mp_partition = /*...*/;