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Export of internal Abseil changes

Browse source 
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d6748c733a70cd74ad9b76a0c9cd6b3fe2cecacf by Xiaoyi Zhang <zhangxy@google.com>:

Remove empty block, to address alerts reported in
https://github.com/abseil/abseil-cpp/issues/368.

PiperOrigin-RevId: 265099887

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232e2036b5668d6d1296b881f9347756d84541ee by Derek Mauro <dmauro@google.com>:

Make the Linux Bazel CI scripts test with the exception mode explicitly set.

PiperOrigin-RevId: 265092105

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942a40696c2c9b833be03e92d22a6ede7bccb6d4 by Xiaoyi Zhang <zhangxy@google.com>:

Import https://github.com/abseil/abseil-cpp/pull/372.
Suppress the unused variable warning on GCC, i.e. "-Wunused-variable".

PiperOrigin-RevId: 265063925

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7ef90796b52cbdc260afc77cf47206f9356471d0 by Xiaoyi Zhang <zhangxy@google.com>:

Add quotes to `ABSL_COMMON_INCLUDE_DIRS` since it's a list and may contain a
`;`. This addresses https://github.com/abseil/abseil-cpp/issues/373.

PiperOrigin-RevId: 265059077

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43f3ae742e00b83672ad6c5bc5b17fdb8f9fe6fe by Gennadiy Rozental <rogeeff@google.com>:

Internal re-organization

PiperOrigin-RevId: 264913945

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6a2adf9c08ee1d98cc6b2855a676345c6495294a by Andy Soffer <asoffer@google.com>:

Publicly expose type names for uniform interval tags as in, for example, absl::IntervalClosedClosedTag, and add equality comparison operators.

PiperOrigin-RevId: 264861162

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3c90c6e05fd61d56b419cd2d39dab8f17b8711b8 by Abseil Team <absl-team@google.com>:

Add validity check on returned frame pointer.

PiperOrigin-RevId: 264858823

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2db87e0cfa0c6bea7ba81684b834cb8a73b7d748 by Gennadiy Rozental <rogeeff@google.com>:

Add MUST_USE_RESULT attribute to absl::GetFlag to prevent accidental misuse.

PiperOrigin-RevId: 264782762
GitOrigin-RevId: d6748c733a70cd74ad9b76a0c9cd6b3fe2cecacf
Change-Id: I169e9c5358e4f63000c1255e806d26b8afecf5ff
This commit is contained in:
Abseil Team 2019-08-23 11:38:04 -07:00 • committed by Xiaoyi Zhang
parent 0302d1e5fa
commit 2d2d7fbc28
24 changed files with 550 additions and 393 deletions
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49
absl/flags/internal/flag.h
View file

@ -22,20 +22,30 @@
namespace absl {
namespace flags_internal {
// Signature for the mutation callback used by watched Flags
// The callback is noexcept.
// TODO(rogeeff): add noexcept after C++17 support is added.
using FlagCallback = void (*)();
void InvokeCallback(absl::Mutex* primary_mu, absl::Mutex* callback_mu,
FlagCallback cb) EXCLUSIVE_LOCKS_REQUIRED(primary_mu);
// This is "unspecified" implementation of absl::Flag<T> type.
template <typename T>
class Flag : public flags_internal::CommandLineFlag {
class Flag final : public flags_internal::CommandLineFlag {
public:
constexpr Flag(const char* name, const flags_internal::HelpGenFunc help_gen,
const char* filename,
constexpr Flag(const char* name_arg,
const flags_internal::HelpGenFunc help_gen,
const char* filename_arg,
const flags_internal::FlagMarshallingOpFn marshalling_op_arg,
const flags_internal::InitialValGenFunc initial_value_gen)
: flags_internal::CommandLineFlag(
name, flags_internal::HelpText::FromFunctionPointer(help_gen),
filename, &flags_internal::FlagOps<T>, marshalling_op_arg,
name_arg, flags_internal::HelpText::FromFunctionPointer(help_gen),
filename_arg, &flags_internal::FlagOps<T>, marshalling_op_arg,
initial_value_gen,
/*retired_arg=*/false, /*def_arg=*/nullptr,
/*cur_arg=*/nullptr) {}
/*def_arg=*/nullptr,
/*cur_arg=*/nullptr),
callback_(nullptr) {}
T Get() const {
// Implementation notes:
@ -76,6 +86,31 @@ class Flag : public flags_internal::CommandLineFlag {
}
void Set(const T& v) { this->Write(&v, &flags_internal::FlagOps<T>); }
void SetCallback(const flags_internal::FlagCallback mutation_callback) {
absl::MutexLock l(InitFlagIfNecessary());
callback_ = mutation_callback;
InvokeCallback();
}
void InvokeCallback() override
EXCLUSIVE_LOCKS_REQUIRED(this->locks->primary_mu) {
flags_internal::InvokeCallback(&this->locks->primary_mu,
&this->locks->callback_mu, callback_);
}
private:
void Destroy() const override {
// Values are heap allocated Abseil Flags.
if (this->cur) Delete(this->op, this->cur);
if (this->def) Delete(this->op, this->def);
delete this->locks;
}
// Flag's data
FlagCallback callback_; // Mutation callback
};
// This class facilitates Flag object registration and tail expression-based