Squashed 'third_party/abseil/' changes from ddf8e52a2..384af0e91
384af0e91 Export of internal Abseil changes
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9f8b87b71 Add missing word 'library' in the 'status' description (#868)
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1bae23e32 Export of internal Abseil changes
6df644c56 Include the status library into the main README. (#863)
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6b03bf543 fix build dll (#797)
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731852f10 Fix stacktrace on aarch64 architecture. Fixes #805 (#827)
2e5f2bcfd moved deleted functions to public for better compiler errors. (#828)
e9e9b9fc7 Export of internal Abseil changes
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e493d6acb fix compile fails with asan and -Wredundant-decls (#801)
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40fdb59d3 btree: fix sign-compare warnings (#800)
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7680a5f8e Added missing asserts for seq.index() < capacity_ and unified their usage based on has_element(). (#781)
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2c8a5b0d8 Export of internal Abseil changes
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3c2bed2e7 Export of internal Abseil changes
ea8a689cf fix build on P9 (#739)
672d9e0ae Export of internal Abseil changes
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55c04eb92 Export of internal Abseil changes
302b250e1 Disable pthread for standalone wasm build support (#721)
61d8bc057 Merge branch 'master' of https://github.com/abseil/abseil-cpp into master
4b5b25a28 cmake: remove unneeded enable_testing() cmd (#736)
63f2c695e cmake: flag conformance_testing as TESTONLY (#737)
d5269a8b6 Export of internal Abseil changes
23f1f9cf6 Typo in comment (#733)
259301a52 Fix CMake path for INSTALL_INCLUDEDIR (#723)
dc464c1dc Allow overriding Abseil IDE folder (#724)
bf655de09 Export of internal Abseil changes
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1d31b5c36 Export of internal Abseil changes
da3a87690 Export of internal Abseil changes
8faf20461 Exclude empty directories (#697)
2069dc796 Export of internal Abseil changes
4832bf6bf Added a BUILD file in root to expose license. (#695)
af8f994af Export of internal Abseil changes
33caf1097 Export of internal Abseil changes
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768eb2ca2 Export of internal Abseil changes
3f347c462 Fix build on riscv32 (#675)
62cf6a704 Export of internal Abseil changes
d118d4bb1 Export of internal Abseil changes
f2bc9d11e Fix public target name of the random library (#684)
0fecf0e63 Export of internal Abseil changes
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b11574465 fix MSVC warning 4245: conversion signed => unsigned during initialization (#678)
d85783fd0 Export of internal Abseil changes
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ca9856cab Export of internal Abseil changes
6e18c7115 Export of internal Abseil changes
3f48ce1c4 init (#673)
cde2e2410 Export of internal Abseil changes
68494aae9 Fix CMake Threads dependency issue
902909a43 Export of internal Abseil changes
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1a02b7a20 Use "-lrt" instead of the resolved find_library result when linking librt (#665)
df60c82df Export of internal Abseil changes
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71079e42c Export of internal Abseil changes
2946ac0de Use base_internal::AtomicHook instead of std::atomic (#661)
567bee2f7 Fix ABSL_RANDOM_RANDEN_COPTS setting on FreeBSD (#664)
bf6166a63 Export of internal Abseil changes
111260963 Export of internal Abseil changes
73ea9a957 Export of internal Abseil changes
c01b9916e Add option to use an externally provided GoogleTest target (for usage of abseil as add_subdirectory target) (#647)
d43b7997c Export of internal Abseil changes
62f05b1f5 Export of internal Abseil changes
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132d791b4 bazel: Add missing load statements for cc_binary (#645)
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2d2a8aea2 Export of internal Abseil changes
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b92f35f65 Fix CompressedTuple move constructor on MSVC (#637)
a877af1f2 Export of internal Abseil changes
d936052d3 Export of internal Abseil changes
238b9a59c Skip the .exe suffix in the helpshort filter on Windows (#629)
417ea99cb UWP doesn't allow reading regkeys (#594)
40a0e58eb Export of internal Abseil changes
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b19ba9676 Export of internal Abseil changes
06f0e767d BuildBreak: UWP apps can't call GetModuleHandle (#596)
bcefbdcdf Export of internal Abseil changes
0033c9ea9 Fix build on FreeBSD/powerpc (#616)
0d5ce2797 Export of internal Abseil changes
b69c7d880 Export of internal Abseil changes
2a5633fc0 Merge "Export of internal Abseil changes"
f9b3d6e49 Add RISCV support to GetProgramCounter() (#621)
914ff4451 Export of internal Abseil changes
0232c87f2 Add missing ABSL_HAVE_VDSO_SUPPORT conditional (#622)
3c8141051 Export of internal Abseil changes
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08a7e7bf9 Export of internal Abseil changes
36bcd9599 Fix pointer format specifier in documentation (#614)
0f86336b6 Export of internal Abseil changes
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37dd2562e Export of internal Abseil changes
444277026 fix: Add support for more ARM processors detection (#608)
159bf2bf6 Export of internal Abseil changes
a2e6adecc Use https links. (#586)
564001ae5 Export of internal Abseil changes
b3aaac8a3 Export of internal Abseil changes
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a048203a8 Export of internal Abseil changes
1de016636 Export of internal Abseil changes
ad904b6cd Export of internal Abseil changes
7bd1935dc cmake: Fix x86_64 check on Windows for random copts (#518)
292351391 Export of internal Abseil changes
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12bc53e03 Export of internal Abseil changes
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fa8c75182 Export of internal Abseil changes
85092b4b6 Fix Conan builds (#400)
e96ae2203 Export of internal Abseil changes
20de2db74 Export of internal Abseil changes
846e5dbed Export of internal Abseil changes
83880e3d8 Merge branch 'master' of https://github.com/abseil/abseil-cpp
8207907f4 Export of internal Abseil changes
39d68a422 docs: fix typo (#397)
078b89b3c Export of internal Abseil changes
19b021cb3 Export of internal Abseil changes
ecc0033b5 Always enable proper symbolize implementation on Windows (#257)
2796d500a Export of internal Abseil changes
e4c8d0eb8 Export of internal Abseil changes
a15364ce4 Export of internal Abseil changes
ab3552a18 Export of internal Abseil changes
e9f9000c7 Fix ABSL_WAITER_MODE detection for mingw (#342)
abea769b5 Fix ABSL_HAVE_ALARM check on mingw (#341)
25597bdfc Export of internal Abseil changes
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debac94cf Export of internal Abseil changes
882b3501a Fix spelling errors (#384)
502efe6d7 Export of internal Abseil changes
ccdd1d57b Export of internal Abseil changes
Change-Id: I59864a0053f6e03d88cc9d5e2a92757039a05484
git-subtree-dir: third_party/abseil
git-subtree-split: 384af0e9141283172e2bff3210dae79fb7130d9c
diff --git a/absl/strings/str_format.h b/absl/strings/str_format.h
index 607e2bc..0146510 100644
--- a/absl/strings/str_format.h
+++ b/absl/strings/str_format.h
@@ -19,7 +19,7 @@
//
// The `str_format` library is a typesafe replacement for the family of
// `printf()` string formatting routines within the `<cstdio>` standard library
-// header. Like the `printf` family, the `str_format` uses a "format string" to
+// header. Like the `printf` family, `str_format` uses a "format string" to
// perform argument substitutions based on types. See the `FormatSpec` section
// below for format string documentation.
//
@@ -57,8 +57,7 @@
// arbitrary sink types:
//
// * A generic `Format()` function to write outputs to arbitrary sink types,
-// which must implement a `RawSinkFormat` interface. (See
-// `str_format_sink.h` for more information.)
+// which must implement a `FormatRawSink` interface.
//
// * A `FormatUntyped()` function that is similar to `Format()` except it is
// loosely typed. `FormatUntyped()` is not a template and does not perform
@@ -66,8 +65,7 @@
// boolean from a runtime check.
//
// In addition, the `str_format` library provides extension points for
-// augmenting formatting to new types. These extensions are fully documented
-// within the `str_format_extension.h` header file.
+// augmenting formatting to new types. See "StrFormat Extensions" below.
#ifndef ABSL_STRINGS_STR_FORMAT_H_
#define ABSL_STRINGS_STR_FORMAT_H_
@@ -82,6 +80,7 @@
#include "absl/strings/internal/str_format/parser.h" // IWYU pragma: export
namespace absl {
+ABSL_NAMESPACE_BEGIN
// UntypedFormatSpec
//
@@ -254,8 +253,8 @@
// argument, etc.
template <typename... Args>
-using FormatSpec =
- typename str_format_internal::FormatSpecDeductionBarrier<Args...>::type;
+using FormatSpec = str_format_internal::FormatSpecTemplate<
+ str_format_internal::ArgumentToConv<Args>()...>;
// ParsedFormat
//
@@ -282,9 +281,36 @@
// } else {
// ... error case ...
// }
+
+#if defined(__cpp_nontype_template_parameter_auto)
+// If C++17 is available, an 'extended' format is also allowed that can specify
+// multiple conversion characters per format argument, using a combination of
+// `absl::FormatConversionCharSet` enum values (logically a set union)
+// via the `|` operator. (Single character-based arguments are still accepted,
+// but cannot be combined). Some common conversions also have predefined enum
+// values, such as `absl::FormatConversionCharSet::kIntegral`.
+//
+// Example:
+// // Extended format supports multiple conversion characters per argument,
+// // specified via a combination of `FormatConversionCharSet` enums.
+// using MyFormat = absl::ParsedFormat<absl::FormatConversionCharSet::d |
+// absl::FormatConversionCharSet::x>;
+// MyFormat GetFormat(bool use_hex) {
+// if (use_hex) return MyFormat("foo %x bar");
+// return MyFormat("foo %d bar");
+// }
+// // `format` can be used with any value that supports 'd' and 'x',
+// // like `int`.
+// auto format = GetFormat(use_hex);
+// value = StringF(format, i);
+template <auto... Conv>
+using ParsedFormat = absl::str_format_internal::ExtendedParsedFormat<
+ absl::str_format_internal::ToFormatConversionCharSet(Conv)...>;
+#else
template <char... Conv>
using ParsedFormat = str_format_internal::ExtendedParsedFormat<
- str_format_internal::ConversionCharToConv(Conv)...>;
+ absl::str_format_internal::ToFormatConversionCharSet(Conv)...>;
+#endif // defined(__cpp_nontype_template_parameter_auto)
// StrFormat()
//
@@ -400,6 +426,12 @@
// This function is functionally equivalent to `std::snprintf()` (and
// type-safe); prefer `absl::SNPrintF()` over `std::snprintf()`.
//
+// In particular, a successful call to `absl::SNPrintF()` writes at most `size`
+// bytes of the formatted output to `output`, including a NUL-terminator, and
+// returns the number of bytes that would have been written if truncation did
+// not occur. In the event of an error, a negative value is returned and `errno`
+// is set.
+//
// Example:
//
// std::string_view s = "Ulaanbaatar";
@@ -425,6 +457,16 @@
//
// FormatRawSink is a type erased wrapper around arbitrary sink objects
// specifically used as an argument to `Format()`.
+//
+// All the object has to do define an overload of `AbslFormatFlush()` for the
+// sink, usually by adding a ADL-based free function in the same namespace as
+// the sink:
+//
+// void AbslFormatFlush(MySink* dest, absl::string_view part);
+//
+// where `dest` is the pointer passed to `absl::Format()`. The function should
+// append `part` to `dest`.
+//
// FormatRawSink does not own the passed sink object. The passed object must
// outlive the FormatRawSink.
class FormatRawSink {
@@ -448,12 +490,13 @@
// `absl::FormatRawSink` interface), using a format string and zero or more
// additional arguments.
//
-// By default, `std::string` and `std::ostream` are supported as destination
-// objects. If a `std::string` is used the formatted string is appended to it.
+// By default, `std::string`, `std::ostream`, and `absl::Cord` are supported as
+// destination objects. If a `std::string` is used the formatted string is
+// appended to it.
//
-// `absl::Format()` is a generic version of `absl::StrFormat(), for custom
-// sinks. The format string, like format strings for `StrFormat()`, is checked
-// at compile-time.
+// `absl::Format()` is a generic version of `absl::StrAppendFormat()`, for
+// custom sinks. The format string, like format strings for `StrFormat()`, is
+// checked at compile-time.
//
// On failure, this function returns `false` and the state of the sink is
// unspecified.
@@ -524,6 +567,247 @@
str_format_internal::UntypedFormatSpecImpl::Extract(format), args);
}
+//------------------------------------------------------------------------------
+// StrFormat Extensions
+//------------------------------------------------------------------------------
+//
+// AbslFormatConvert()
+//
+// The StrFormat library provides a customization API for formatting
+// user-defined types using absl::StrFormat(). The API relies on detecting an
+// overload in the user-defined type's namespace of a free (non-member)
+// `AbslFormatConvert()` function, usually as a friend definition with the
+// following signature:
+//
+// absl::FormatConvertResult<...> AbslFormatConvert(
+// const X& value,
+// const absl::FormatConversionSpec& spec,
+// absl::FormatSink *sink);
+//
+// An `AbslFormatConvert()` overload for a type should only be declared in the
+// same file and namespace as said type.
+//
+// The abstractions within this definition include:
+//
+// * An `absl::FormatConversionSpec` to specify the fields to pull from a
+// user-defined type's format string
+// * An `absl::FormatSink` to hold the converted string data during the
+// conversion process.
+// * An `absl::FormatConvertResult` to hold the status of the returned
+// formatting operation
+//
+// The return type encodes all the conversion characters that your
+// AbslFormatConvert() routine accepts. The return value should be {true}.
+// A return value of {false} will result in `StrFormat()` returning
+// an empty string. This result will be propagated to the result of
+// `FormatUntyped`.
+//
+// Example:
+//
+// struct Point {
+// // To add formatting support to `Point`, we simply need to add a free
+// // (non-member) function `AbslFormatConvert()`. This method interprets
+// // `spec` to print in the request format. The allowed conversion characters
+// // can be restricted via the type of the result, in this example
+// // string and integral formatting are allowed (but not, for instance
+// // floating point characters like "%f"). You can add such a free function
+// // using a friend declaration within the body of the class:
+// friend absl::FormatConvertResult<absl::FormatConversionCharSet::kString |
+// absl::FormatConversionCharSet::kIntegral>
+// AbslFormatConvert(const Point& p, const absl::FormatConversionSpec& spec,
+// absl::FormatSink* s) {
+// if (spec.conversion_char() == absl::FormatConversionChar::s) {
+// s->Append(absl::StrCat("x=", p.x, " y=", p.y));
+// } else {
+// s->Append(absl::StrCat(p.x, ",", p.y));
+// }
+// return {true};
+// }
+//
+// int x;
+// int y;
+// };
+
+// clang-format off
+
+// FormatConversionChar
+//
+// Specifies the formatting character provided in the format string
+// passed to `StrFormat()`.
+enum class FormatConversionChar : uint8_t {
+ c, s, // text
+ d, i, o, u, x, X, // int
+ f, F, e, E, g, G, a, A, // float
+ n, p // misc
+};
+// clang-format on
+
+// FormatConversionSpec
+//
+// Specifies modifications to the conversion of the format string, through use
+// of one or more format flags in the source format string.
+class FormatConversionSpec {
+ public:
+ // FormatConversionSpec::is_basic()
+ //
+ // Indicates that width and precision are not specified, and no additional
+ // flags are set for this conversion character in the format string.
+ bool is_basic() const { return impl_.is_basic(); }
+
+ // FormatConversionSpec::has_left_flag()
+ //
+ // Indicates whether the result should be left justified for this conversion
+ // character in the format string. This flag is set through use of a '-'
+ // character in the format string. E.g. "%-s"
+ bool has_left_flag() const { return impl_.has_left_flag(); }
+
+ // FormatConversionSpec::has_show_pos_flag()
+ //
+ // Indicates whether a sign column is prepended to the result for this
+ // conversion character in the format string, even if the result is positive.
+ // This flag is set through use of a '+' character in the format string.
+ // E.g. "%+d"
+ bool has_show_pos_flag() const { return impl_.has_show_pos_flag(); }
+
+ // FormatConversionSpec::has_sign_col_flag()
+ //
+ // Indicates whether a mandatory sign column is added to the result for this
+ // conversion character. This flag is set through use of a space character
+ // (' ') in the format string. E.g. "% i"
+ bool has_sign_col_flag() const { return impl_.has_sign_col_flag(); }
+
+ // FormatConversionSpec::has_alt_flag()
+ //
+ // Indicates whether an "alternate" format is applied to the result for this
+ // conversion character. Alternative forms depend on the type of conversion
+ // character, and unallowed alternatives are undefined. This flag is set
+ // through use of a '#' character in the format string. E.g. "%#h"
+ bool has_alt_flag() const { return impl_.has_alt_flag(); }
+
+ // FormatConversionSpec::has_zero_flag()
+ //
+ // Indicates whether zeroes should be prepended to the result for this
+ // conversion character instead of spaces. This flag is set through use of the
+ // '0' character in the format string. E.g. "%0f"
+ bool has_zero_flag() const { return impl_.has_zero_flag(); }
+
+ // FormatConversionSpec::conversion_char()
+ //
+ // Returns the underlying conversion character.
+ FormatConversionChar conversion_char() const {
+ return impl_.conversion_char();
+ }
+
+ // FormatConversionSpec::width()
+ //
+ // Returns the specified width (indicated through use of a non-zero integer
+ // value or '*' character) of the conversion character. If width is
+ // unspecified, it returns a negative value.
+ int width() const { return impl_.width(); }
+
+ // FormatConversionSpec::precision()
+ //
+ // Returns the specified precision (through use of the '.' character followed
+ // by a non-zero integer value or '*' character) of the conversion character.
+ // If precision is unspecified, it returns a negative value.
+ int precision() const { return impl_.precision(); }
+
+ private:
+ explicit FormatConversionSpec(
+ str_format_internal::FormatConversionSpecImpl impl)
+ : impl_(impl) {}
+
+ friend str_format_internal::FormatConversionSpecImpl;
+
+ absl::str_format_internal::FormatConversionSpecImpl impl_;
+};
+
+// Type safe OR operator for FormatConversionCharSet to allow accepting multiple
+// conversion chars in custom format converters.
+constexpr FormatConversionCharSet operator|(FormatConversionCharSet a,
+ FormatConversionCharSet b) {
+ return static_cast<FormatConversionCharSet>(static_cast<uint64_t>(a) |
+ static_cast<uint64_t>(b));
+}
+
+// FormatConversionCharSet
+//
+// Specifies the _accepted_ conversion types as a template parameter to
+// FormatConvertResult for custom implementations of `AbslFormatConvert`.
+// Note the helper predefined alias definitions (kIntegral, etc.) below.
+enum class FormatConversionCharSet : uint64_t {
+ // text
+ c = str_format_internal::FormatConversionCharToConvInt('c'),
+ s = str_format_internal::FormatConversionCharToConvInt('s'),
+ // integer
+ d = str_format_internal::FormatConversionCharToConvInt('d'),
+ i = str_format_internal::FormatConversionCharToConvInt('i'),
+ o = str_format_internal::FormatConversionCharToConvInt('o'),
+ u = str_format_internal::FormatConversionCharToConvInt('u'),
+ x = str_format_internal::FormatConversionCharToConvInt('x'),
+ X = str_format_internal::FormatConversionCharToConvInt('X'),
+ // Float
+ f = str_format_internal::FormatConversionCharToConvInt('f'),
+ F = str_format_internal::FormatConversionCharToConvInt('F'),
+ e = str_format_internal::FormatConversionCharToConvInt('e'),
+ E = str_format_internal::FormatConversionCharToConvInt('E'),
+ g = str_format_internal::FormatConversionCharToConvInt('g'),
+ G = str_format_internal::FormatConversionCharToConvInt('G'),
+ a = str_format_internal::FormatConversionCharToConvInt('a'),
+ A = str_format_internal::FormatConversionCharToConvInt('A'),
+ // misc
+ n = str_format_internal::FormatConversionCharToConvInt('n'),
+ p = str_format_internal::FormatConversionCharToConvInt('p'),
+
+ // Used for width/precision '*' specification.
+ kStar = static_cast<uint64_t>(
+ absl::str_format_internal::FormatConversionCharSetInternal::kStar),
+ // Some predefined values:
+ kIntegral = d | i | u | o | x | X,
+ kFloating = a | e | f | g | A | E | F | G,
+ kNumeric = kIntegral | kFloating,
+ kString = s,
+ kPointer = p,
+};
+
+// FormatSink
+//
+// An abstraction to which conversions write their string data.
+//
+class FormatSink {
+ public:
+ // Appends `count` copies of `ch`.
+ void Append(size_t count, char ch) { sink_->Append(count, ch); }
+
+ void Append(string_view v) { sink_->Append(v); }
+
+ // Appends the first `precision` bytes of `v`. If this is less than
+ // `width`, spaces will be appended first (if `left` is false), or
+ // after (if `left` is true) to ensure the total amount appended is
+ // at least `width`.
+ bool PutPaddedString(string_view v, int width, int precision, bool left) {
+ return sink_->PutPaddedString(v, width, precision, left);
+ }
+
+ private:
+ friend str_format_internal::FormatSinkImpl;
+ explicit FormatSink(str_format_internal::FormatSinkImpl* s) : sink_(s) {}
+ str_format_internal::FormatSinkImpl* sink_;
+};
+
+// FormatConvertResult
+//
+// Indicates whether a call to AbslFormatConvert() was successful.
+// This return type informs the StrFormat extension framework (through
+// ADL but using the return type) of what conversion characters are supported.
+// It is strongly discouraged to return {false}, as this will result in an
+// empty string in StrFormat.
+template <FormatConversionCharSet C>
+struct FormatConvertResult {
+ bool value;
+};
+
+ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_STRINGS_STR_FORMAT_H_