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Export of internal Abseil changes

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a9ac6567c0933d786d68c10011e3f3ff9deedf89 by Greg Falcon <gfalcon@google.com>:

Add absl::FunctionRef, a type analogous to the proposed C++23 std::function_ref.

Like std::function, FunctionRef can be used to type-erase any callable (invokable) object.  However, FunctionRef works by reference: it does not store a copy of the type-erased object.  If the wrapped object is destroyed before the FunctionRef, the reference becomes dangling.

FunctionRef relates to std::function in much the same way that string_view relates to std::string.

Because of these limitations, FunctionRef is best used only as a function argument type, and only where the function will be invoked immediately (rather than saved for later use).  When `const std::function<...>&` is used in this way, `absl::FunctionRef<...>` is a better-performing replacement.

PiperOrigin-RevId: 275484044

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1f7c4df3760f8b93e5a5baf40b070eca1d3f4c98 by Abseil Team <absl-team@google.com>:

Add FastHexToBufferZeroPad16() function for blazingly fast hex encoding of uint64_t.

PiperOrigin-RevId: 275420901

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08d48ac004eba57cf2f1ada827181a2995f74807 by Abseil Team <absl-team@google.com>:

Avoid applying the workaround for MSVC's static initialization problems when using clang-cl.

PiperOrigin-RevId: 275366326

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40be82bd2b34670b5458c0a72a0475086153c2d6 by Abseil Team <absl-team@google.com>:

Added comments to SimpleAtof()/SimpleAtod() that clarify that they
always use the "C" locale, unlike the standard functions strtod()
and strtof() referenced now in the comments.

PiperOrigin-RevId: 275355815

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086779dacb3f6f2b3ab59947e94e79046bdb1fe1 by Jorg Brown <jorg@google.com>:

Move the hex conversion table used by escaping.cc into numbers.h so
that other parts of Abseil can more efficiently access it.

PiperOrigin-RevId: 275331251

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3c4ed1b04e55d96a40cbe70fb70929ffbb0c0432 by Abseil Team <absl-team@google.com>:

Avoid applying the workaround for MSVC's static initialization problems when using clang-cl.

PiperOrigin-RevId: 275323858

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56ceb58ab688c3761978308609b09a1ac2739c9a by Derek Mauro <dmauro@google.com>:

Add script for testing on Alpine Linux (for musl test coverage)

PiperOrigin-RevId: 275321244
GitOrigin-RevId: a9ac6567c0933d786d68c10011e3f3ff9deedf89
Change-Id: I39799fa03768ddb44f3166200c860e1da4461807
This commit is contained in:
Abseil Team 2019-10-18 09:06:29 -07:00 • committed by Andy Soffer
parent a15364ce4d
commit e4c8d0eb8e
15 changed files with 887 additions and 40 deletions
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33
absl/strings/escaping.cc
View file

@ -35,27 +35,6 @@
namespace absl {
namespace {
// Digit conversion.
constexpr char kHexChar[] = "0123456789abcdef";
constexpr char kHexTable[513] =
"000102030405060708090a0b0c0d0e0f"
"101112131415161718191a1b1c1d1e1f"
"202122232425262728292a2b2c2d2e2f"
"303132333435363738393a3b3c3d3e3f"
"404142434445464748494a4b4c4d4e4f"
"505152535455565758595a5b5c5d5e5f"
"606162636465666768696a6b6c6d6e6f"
"707172737475767778797a7b7c7d7e7f"
"808182838485868788898a8b8c8d8e8f"
"909192939495969798999a9b9c9d9e9f"
"a0a1a2a3a4a5a6a7a8a9aaabacadaeaf"
"b0b1b2b3b4b5b6b7b8b9babbbcbdbebf"
"c0c1c2c3c4c5c6c7c8c9cacbcccdcecf"
"d0d1d2d3d4d5d6d7d8d9dadbdcdddedf"
"e0e1e2e3e4e5e6e7e8e9eaebecedeeef"
"f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff";
// These are used for the leave_nulls_escaped argument to CUnescapeInternal().
constexpr bool kUnescapeNulls = false;
@ -348,14 +327,14 @@ std::string CEscapeInternal(absl::string_view src, bool use_hex,
(last_hex_escape && absl::ascii_isxdigit(c)))) {
if (use_hex) {
dest.append("\\" "x");
dest.push_back(kHexChar[c / 16]);
dest.push_back(kHexChar[c % 16]);
dest.push_back(numbers_internal::kHexChar[c / 16]);
dest.push_back(numbers_internal::kHexChar[c % 16]);
is_hex_escape = true;
} else {
dest.append("\\");
dest.push_back(kHexChar[c / 64]);
dest.push_back(kHexChar[(c % 64) / 8]);
dest.push_back(kHexChar[c % 8]);
dest.push_back(numbers_internal::kHexChar[c / 64]);
dest.push_back(numbers_internal::kHexChar[(c % 64) / 8]);
dest.push_back(numbers_internal::kHexChar[c % 8]);
}
} else {
dest.push_back(c);
@ -1019,7 +998,7 @@ template <typename T>
void BytesToHexStringInternal(const unsigned char* src, T dest, ptrdiff_t num) {
auto dest_ptr = &dest[0];
for (auto src_ptr = src; src_ptr != (src + num); ++src_ptr, dest_ptr += 2) {
const char* hex_p = &kHexTable[*src_ptr * 2];
const char* hex_p = &numbers_internal::kHexTable[*src_ptr * 2];
std::copy(hex_p, hex_p + 2, dest_ptr);
}
}