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Export of internal Abseil changes

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44ccc0320ffaa2106ba3c6393b5a40c3b4f7b901 by Abseil Team <absl-team@google.com>:

Clarify span iterator documentation.

PiperOrigin-RevId: 299110584

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80d016d8026b8d6904aa0ff2d5e1c3ae27f129bb by Greg Falcon <gfalcon@google.com>:

Add Cord::TryFlat().

PiperOrigin-RevId: 298889772

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da6900203f1e4131d5693cbca157b6dba099bbed by Greg Falcon <gfalcon@google.com>:

clang-format cord_test.cc.

PiperOrigin-RevId: 298851425
GitOrigin-RevId: 44ccc0320ffaa2106ba3c6393b5a40c3b4f7b901
Change-Id: Ia5394f6fbb473d206726fdd48a00eb07a6acad6a
This commit is contained in:
Abseil Team 2020-03-05 08:37:17 -08:00 • committed by Derek Mauro
parent b19ba96766
commit cf3a1998e9
5 changed files with 101 additions and 25 deletions
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19
absl/strings/cord.h
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@ -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) {