Export of internal Abseil changes

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330051e00cd57ee516b4eaf656965656ffbcd0bc by Abseil Team <absl-team@google.com>:

Fix indentation in comment.

PiperOrigin-RevId: 287997504

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35fb1a893e708031ba4fc0db460875eb0d31820e by Abseil Team <absl-team@google.com>:

Enable compile-time enforcement that absl::Substitute patterns to not contain unescaped $ symbols.

absl::Substitute already considers unescaped $ symbols undefined behavior and crashes when it's passed them in debug builds.  Some code isn't ever built in debug mode, though, and inadvertently used some unescaped $ symbols, which led to surprising results.  This change will prevent that problem from happening in the future.
PiperOrigin-RevId: 287906643

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c5762833ebde6d7110bf68041a823b571c238e9e by Gennadiy Rozental <rogeeff@google.com>:

Move all the flag data into a single place instead of being split between handle and flag object.

After this change CommandLineFlag will not hold any data anymore. And we also do not need to pass the CommandLineFlag around in Abseil Flag implementation to report flag name and location.

PiperOrigin-RevId: 287899076

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8b5fb644f1e3d9267b7a75106fe9a72c886db786 by Derek Mauro <dmauro@google.com>:

Upgrade CI testing to Bazel 2.0.0 and Clang 407ac2eb5f13

-fno-sanitize-blacklist is to workaround
https://github.com/bazelbuild/bazel/issues/10510

PiperOrigin-RevId: 287875363

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a20cc1d58895de2babc3748a6c79d1d6813734ef by Abseil Team <absl-team@google.com>:

Make ABSL_RETIRED_FLAG behave consistently with ABSL_FLAG.

Before the change:
ABSL_RETIRED_FLAG does not compile when there are competing ctors in the type, even when ABSL_FLAG does.

After the change:
ABSL_RETIRED_FLAG compiles when ABSL_FLAG does.

PiperOrigin-RevId: 286483183

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1cff7e67329d2be9e50bee1f2e76ef9ffd2edde5 by Abseil Team <absl-team@google.com>:

Support C++20 erase_if API in unordered associative containers

See [unord.set.erasure]: https://eel.is/c++draft/unord.set.erasure
See [unord.map.erasure]: https://eel.is/c++draft/unord.map.erasure

PiperOrigin-RevId: 286461140
GitOrigin-RevId: 330051e00cd57ee516b4eaf656965656ffbcd0bc
Change-Id: I5513110b41c2af08a44da54612cff341ac5c6607

1 files changed, 19 insertions, 29 deletions

diff --git a/absl/flags/flag.h b/absl/flags/flag.h
index f18e9f56a5cc..326fb8ee6894 100644
--- a/absl/flags/flag.h
+++ b/absl/flags/flag.h
@@ -94,14 +94,14 @@ class Flag {
   // Visual Studio 2015 still requires the constructor for class to be
   // constexpr initializable.
 #if _MSC_VER <= 1900
-  constexpr Flag(const char* name, const flags_internal::HelpGenFunc help_gen,
-                 const char* filename,
+  constexpr Flag(const char* name, const char* filename,
                  const flags_internal::FlagMarshallingOpFn marshalling_op,
+                 const flags_internal::HelpGenFunc help_gen,
                  const flags_internal::FlagDfltGenFunc default_value_gen)
       : name_(name),
-        help_gen_(help_gen),
         filename_(filename),
         marshalling_op_(marshalling_op),
+        help_gen_(help_gen),
         default_value_gen_(default_value_gen),
         inited_(false),
         impl_(nullptr) {}
@@ -116,10 +116,10 @@ class Flag {
       }
 
       impl_ = new flags_internal::Flag<T>(
-          name_,
+          name_, filename_, marshalling_op_,
           {flags_internal::FlagHelpSrc(help_gen_),
            flags_internal::FlagHelpSrcKind::kGenFunc},
-          filename_, marshalling_op_, default_value_gen_);
+          default_value_gen_);
       inited_.store(true, std::memory_order_release);
     }
 
@@ -155,9 +155,9 @@ class Flag {
   // The data members are logically private, but they need to be public for
   // this to be an aggregate type.
   const char* name_;
-  const flags_internal::HelpGenFunc help_gen_;
   const char* filename_;
   const flags_internal::FlagMarshallingOpFn marshalling_op_;
+  const flags_internal::HelpGenFunc help_gen_;
   const flags_internal::FlagDfltGenFunc default_value_gen_;
 
   mutable std::atomic<bool> inited_;
@@ -342,26 +342,24 @@ ABSL_NAMESPACE_END
   ABSL_FLAG_IMPL_DECLARE_DEF_VAL_WRAPPER(name, Type, default_value) \
   ABSL_FLAG_IMPL_DECLARE_HELP_WRAPPER(name, help);                  \
   ABSL_CONST_INIT absl::Flag<Type> FLAGS_##name{                    \
-      ABSL_FLAG_IMPL_FLAGNAME(#name),                               \
-      absl::flags_internal::HelpArg<AbslFlagHelpGenFor##name>(0),   \
-      ABSL_FLAG_IMPL_FILENAME(),                                    \
+      ABSL_FLAG_IMPL_FLAGNAME(#name), ABSL_FLAG_IMPL_FILENAME(),    \
       &absl::flags_internal::FlagMarshallingOps<Type>,              \
+      absl::flags_internal::HelpArg<AbslFlagHelpGenFor##name>(0),   \
       &AbslFlagsInitFlag##name};                                    \
   extern bool FLAGS_no##name;                                       \
   bool FLAGS_no##name = ABSL_FLAG_IMPL_REGISTRAR(Type, FLAGS_##name)
 #else
 // MSVC version uses aggregate initialization. We also do not try to
 // optimize away help wrapper.
-#define ABSL_FLAG_IMPL(Type, name, default_value, help)                    \
-  namespace absl /* block flags in namespaces */ {}                        \
-  ABSL_FLAG_IMPL_DECLARE_DEF_VAL_WRAPPER(name, Type, default_value)        \
-  ABSL_FLAG_IMPL_DECLARE_HELP_WRAPPER(name, help);                         \
-  ABSL_CONST_INIT absl::Flag<Type> FLAGS_##name{                           \
-      ABSL_FLAG_IMPL_FLAGNAME(#name), &AbslFlagHelpGenFor##name::NonConst, \
-      ABSL_FLAG_IMPL_FILENAME(),                                           \
-      &absl::flags_internal::FlagMarshallingOps<Type>,                     \
-      &AbslFlagsInitFlag##name};                                           \
-  extern bool FLAGS_no##name;                                              \
+#define ABSL_FLAG_IMPL(Type, name, default_value, help)               \
+  namespace absl /* block flags in namespaces */ {}                   \
+  ABSL_FLAG_IMPL_DECLARE_DEF_VAL_WRAPPER(name, Type, default_value)   \
+  ABSL_FLAG_IMPL_DECLARE_HELP_WRAPPER(name, help);                    \
+  ABSL_CONST_INIT absl::Flag<Type> FLAGS_##name{                      \
+      ABSL_FLAG_IMPL_FLAGNAME(#name), ABSL_FLAG_IMPL_FILENAME(),      \
+      &absl::flags_internal::FlagMarshallingOps<Type>,                \
+      &AbslFlagHelpGenFor##name::NonConst, &AbslFlagsInitFlag##name}; \
+  extern bool FLAGS_no##name;                                         \
   bool FLAGS_no##name = ABSL_FLAG_IMPL_REGISTRAR(Type, FLAGS_##name)
 #endif
 
@@ -384,19 +382,11 @@ ABSL_NAMESPACE_END
 //
 // `default_value` is only used as a double check on the type. `explanation` is
 // unused.
-//
-// ABSL_RETIRED_FLAG support omitting the default value for default
-// constructible value type, so that users can delete the code generatring this
-// value.
-//
 // TODO(rogeeff): Return an anonymous struct instead of bool, and place it into
 // the unnamed namespace.
 #define ABSL_RETIRED_FLAG(type, flagname, default_value, explanation) \
-  ABSL_ATTRIBUTE_UNUSED static const bool ignored_##flagname =             \
-      ([] {                                                                \
-           return absl::flags_internal::MakeFromDefaultValueOrEmpty<type>( \
-                   default_value);                                         \
-       },                                                                  \
+  ABSL_ATTRIBUTE_UNUSED static const bool ignored_##flagname =        \
+      ([] { return type(default_value); },                            \
        absl::flags_internal::RetiredFlag<type>(#flagname))
 
 #endif  // ABSL_FLAGS_FLAG_H_