diff options
Diffstat (limited to 'absl/strings/cord_analysis.h')
| -rw-r--r-- | absl/strings/cord_analysis.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/absl/strings/cord_analysis.h b/absl/strings/cord_analysis.h index 7041ad1a..9b9527a5 100644 --- a/absl/strings/cord_analysis.h +++ b/absl/strings/cord_analysis.h @@ -31,6 +31,24 @@ namespace cord_internal { size_t GetEstimatedMemoryUsage(const CordRep* rep); // Returns the *approximate* number of bytes held in full or in part by this +// Cord for the distinct memory held by this cord. This is similar to +// `GetEstimatedMemoryUsage()`, except that if the cord has multiple references +// to the same memory, that memory is only counted once. +// +// For example: +// absl::Cord cord; +// cord.append(some_other_cord); +// cord.append(some_other_cord); +// // Calls GetEstimatedMemoryUsage() and counts `other_cord` twice: +// cord.EstimatedMemoryUsage(kTotal); +// // Calls GetMorePreciseMemoryUsage() and counts `other_cord` once: +// cord.EstimatedMemoryUsage(kTotalMorePrecise); +// +// This is more expensive than `GetEstimatedMemoryUsage()` as it requires +// deduplicating all memory references. +size_t GetMorePreciseMemoryUsage(const CordRep* rep); + +// Returns the *approximate* number of bytes held in full or in part by this // CordRep weighted by the sharing ratio of that data. For example, if some data // edge is shared by 4 different Cords, then each cord is attribute 1/4th of // the total memory usage as a 'fair share' of the total memory usage. |