diff options
Diffstat (limited to 'abseil-cpp/absl/container/flat_hash_map.h')
| -rw-r--r-- | abseil-cpp/absl/container/flat_hash_map.h | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/abseil-cpp/absl/container/flat_hash_map.h b/abseil-cpp/absl/container/flat_hash_map.h index 74def0d..8f4d993 100644 --- a/abseil-cpp/absl/container/flat_hash_map.h +++ b/abseil-cpp/absl/container/flat_hash_map.h @@ -36,6 +36,7 @@ #include <utility> #include "absl/algorithm/container.h" +#include "absl/base/macros.h" #include "absl/container/internal/container_memory.h" #include "absl/container/internal/hash_function_defaults.h" // IWYU pragma: export #include "absl/container/internal/raw_hash_map.h" // IWYU pragma: export @@ -75,6 +76,10 @@ struct FlatHashMapPolicy; // absl/hash/hash.h for information on extending Abseil hashing to user-defined // types. // +// Using `absl::flat_hash_map` at interface boundaries in dynamically loaded +// libraries (e.g. .dll, .so) is unsupported due to way `absl::Hash` values may +// be randomized across dynamically loaded libraries. +// // NOTE: A `flat_hash_map` stores its value types directly inside its // implementation array to avoid memory indirection. Because a `flat_hash_map` // is designed to move data when rehashed, map values will not retain pointer @@ -230,7 +235,11 @@ class flat_hash_map : public absl::container_internal::raw_hash_map< // iterator erase(const_iterator first, const_iterator last): // // Erases the elements in the open interval [`first`, `last`), returning an - // iterator pointing to `last`. + // iterator pointing to `last`. The special case of calling + // `erase(begin(), end())` resets the reserved growth such that if + // `reserve(N)` has previously been called and there has been no intervening + // call to `clear()`, then after calling `erase(begin(), end())`, it is safe + // to assume that inserting N elements will not cause a rehash. // // size_type erase(const key_type& key): // @@ -356,8 +365,8 @@ class flat_hash_map : public absl::container_internal::raw_hash_map< // `flat_hash_map`. // // iterator try_emplace(const_iterator hint, - // const init_type& k, Args&&... args): - // iterator try_emplace(const_iterator hint, init_type&& k, Args&&... args): + // const key_type& k, Args&&... args): + // iterator try_emplace(const_iterator hint, key_type&& k, Args&&... args): // // Inserts (via copy or move) the element of the specified key into the // `flat_hash_map` using the position of `hint` as a non-binding suggestion @@ -541,10 +550,12 @@ class flat_hash_map : public absl::container_internal::raw_hash_map< // erase_if(flat_hash_map<>, Pred) // // Erases all elements that satisfy the predicate `pred` from the container `c`. +// Returns the number of erased elements. template <typename K, typename V, typename H, typename E, typename A, typename Predicate> -void erase_if(flat_hash_map<K, V, H, E, A>& c, Predicate pred) { - container_internal::EraseIf(pred, &c); +typename flat_hash_map<K, V, H, E, A>::size_type erase_if( + flat_hash_map<K, V, H, E, A>& c, Predicate pred) { + return container_internal::EraseIf(pred, &c); } namespace container_internal { |