diff options
author | 2020-03-05 08:37:17 -0800 | |
---|---|---|
committer | 2020-03-05 20:52:21 +0000 | |
commit | cf3a1998e9d41709d4141e2f13375993cba1130e (patch) | |
tree | 9574720f5b23f1842a3e884fe79210508c8c6f39 /absl/strings/cord.h | |
parent | b19ba96766db08b1f32605cb4424a0e7ea0c7584 (diff) |
Export of internal Abseil changes
--
44ccc0320ffaa2106ba3c6393b5a40c3b4f7b901 by Abseil Team <absl-team@google.com>:
Clarify span iterator documentation.
PiperOrigin-RevId: 299110584
--
80d016d8026b8d6904aa0ff2d5e1c3ae27f129bb by Greg Falcon <gfalcon@google.com>:
Add Cord::TryFlat().
PiperOrigin-RevId: 298889772
--
da6900203f1e4131d5693cbca157b6dba099bbed by Greg Falcon <gfalcon@google.com>:
clang-format cord_test.cc.
PiperOrigin-RevId: 298851425
GitOrigin-RevId: 44ccc0320ffaa2106ba3c6393b5a40c3b4f7b901
Change-Id: Ia5394f6fbb473d206726fdd48a00eb07a6acad6a
Diffstat (limited to 'absl/strings/cord.h')
-rw-r--r-- | absl/strings/cord.h | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/absl/strings/cord.h b/absl/strings/cord.h index 68a7e52f..29ed7f75 100644 --- a/absl/strings/cord.h +++ b/absl/strings/cord.h @@ -53,6 +53,7 @@ #include "absl/strings/internal/cord_internal.h" #include "absl/strings/internal/resize_uninitialized.h" #include "absl/strings/string_view.h" +#include "absl/types/optional.h" namespace absl { ABSL_NAMESPACE_BEGIN @@ -512,6 +513,10 @@ class Cord { // REQUIRES: 0 <= i < size() char operator[](size_t i) const; + // If this cord's representation is a single flat array, return a + // string_view referencing that array. Otherwise return nullopt. + absl::optional<absl::string_view> TryFlat() const; + // Flattens the cord into a single array and returns a view of the data. // // If the cord was already flat, the contents are not modified. @@ -630,7 +635,7 @@ class Cord { // Helper for MemoryUsage() static size_t MemoryUsageAux(const absl::cord_internal::CordRep* rep); - // Helper for GetFlat() + // Helper for GetFlat() and TryFlat() static bool GetFlatAux(absl::cord_internal::CordRep* rep, absl::string_view* fragment); @@ -942,6 +947,18 @@ inline size_t Cord::EstimatedMemoryUsage() const { return result; } +inline absl::optional<absl::string_view> Cord::TryFlat() const { + absl::cord_internal::CordRep* rep = contents_.tree(); + if (rep == nullptr) { + return absl::string_view(contents_.data(), contents_.size()); + } + absl::string_view fragment; + if (GetFlatAux(rep, &fragment)) { + return fragment; + } + return absl::nullopt; +} + inline absl::string_view Cord::Flatten() { absl::cord_internal::CordRep* rep = contents_.tree(); if (rep == nullptr) { |