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Fix typo

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zerotypos-found
2018-01-23 11:57:55 +09:00
parent 8bffdd64b5
commit 4fee76f416
5 changed files with 12 additions and 12 deletions
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6
doc/article/simple_cxx11_metaprogramming.adoc
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@@ -133,7 +133,7 @@ To do that, we need to first convert `std::tuple<int, float, void*>` to
`mp_list<int, float, void*>`, apply `add_pointer` to each element obtaining
`mp_list<int*, float*, void$$**$$>`, then convert that back to `std::tuple`.
These conversion steps are a quite common occurence, and we'll write a
These conversion steps are a quite common occurrence, and we'll write a
primitive that helps us perform them, called `mp_rename`. We want
```
mp_rename<std::tuple<int, float, void*>, mp_list>
@@ -1097,7 +1097,7 @@ template<class T, class U> using sizeof_less = mp_bool<(sizeof(T) < sizeof(U))>;
Finally, let me show the implementations of `mp_count` and `mp_count_if`, for
no reason other than I find them interesting. `mp_count<L, V>` returns the
number of occurences of the type `V` in the list `L`; `mp_count_if<L, P>`
number of occurrences of the type `V` in the list `L`; `mp_count_if<L, P>`
counts the number of types in `L` for which `P<T>` is `true`.
As a first step, I'll implement `mp_plus`. `mp_plus` is a variadic (not just
@@ -1175,7 +1175,7 @@ whether the list `L` contains the type `V`:
template<class L, class V> using mp_contains = mp_bool<mp_count<L, V>::value != 0>;
```
At first sight, this implementation appears horribly naive and inefficient --
why would we need to count all the occurences just to throw that away if we're
why would we need to count all the occurrences just to throw that away if we're
only interested in a boolean result -- but it's actually pretty competitive and
perfectly usable. We just need to add one slight optimization to `mp_plus`, the
engine behind `mp_count` and `mp_contains`: