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issue #60: add non-const if_contains() which can update the mapped_value.

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greg
2020-08-07 12:58:43 -04:00
parent 73c80e4142
commit 7bbf9dc041
2 changed files with 25 additions and 5 deletions
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parallel_hashmap/phmap.h
Vendored
+15
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@@ -3431,12 +3431,27 @@ public:
#endif
typename Lockable::SharedLock m;
auto it = const_cast<parallel_hash_map*>(this)->find(key, this->hash(key), m);
if (it == this->end())
return false;
std::forward<F>(f)((const mapped_type&)Policy::value(&*it));
return true;
}
template <class K = key_type, class F>
bool if_contains(const key_arg<K>& key, F&& f) {
#if __cplusplus >= 201703L
static_assert(std::is_invocable<F, mapped_type&>::value);
#endif
typename Lockable::UniqueLock m;
auto it = this->find(key, this->hash(key), m);
if (it == this->end())
return false;
std::forward<F>(f)(Policy::value(&*it));
return true;
}
template <class K = key_type, class P = Policy, K* = nullptr>
MappedReference<P> operator[](key_arg<K>&& key) {
return Policy::value(&*try_emplace(std::forward<K>(key)).first);