diff options
Diffstat (limited to 'absl/flags/internal/flag.h')
| -rw-r--r-- | absl/flags/internal/flag.h | 85 |
1 files changed, 39 insertions, 46 deletions
diff --git a/absl/flags/internal/flag.h b/absl/flags/internal/flag.h index 21a10c7..7d5271c 100644 --- a/absl/flags/internal/flag.h +++ b/absl/flags/internal/flag.h @@ -82,6 +82,8 @@ struct HelpInitArg { FlagHelpSrcKind kind; }; +extern const char kStrippedFlagHelp[]; + // HelpConstexprWrap is used by struct AbslFlagHelpGenFor##name generated by // ABSL_FLAG macro. It is only used to silence the compiler in the case where // help message expression is not constexpr and does not have type const char*. @@ -148,11 +150,14 @@ struct DynValueDeleter { // The class encapsulates the Flag's data and safe access to it. class FlagImpl { public: - constexpr FlagImpl(const flags_internal::FlagOpFn op, + constexpr FlagImpl(const char* name, const char* filename, + const flags_internal::FlagOpFn op, const flags_internal::FlagMarshallingOpFn marshalling_op, - const flags_internal::FlagDfltGenFunc default_value_gen, - const HelpInitArg help) - : op_(op), + const HelpInitArg help, + const flags_internal::FlagDfltGenFunc default_value_gen) + : name_(name), + filename_(filename), + op_(op), marshalling_op_(marshalling_op), help_(help.source), help_source_kind_(help.kind), @@ -164,18 +169,18 @@ class FlagImpl { void Destroy(); // Constant access methods + absl::string_view Name() const; + std::string Filename() const; std::string Help() const; bool IsModified() const ABSL_LOCKS_EXCLUDED(*DataGuard()); bool IsSpecifiedOnCommandLine() const ABSL_LOCKS_EXCLUDED(*DataGuard()); std::string DefaultValue() const ABSL_LOCKS_EXCLUDED(*DataGuard()); std::string CurrentValue() const ABSL_LOCKS_EXCLUDED(*DataGuard()); - void Read(const CommandLineFlag& flag, void* dst, - const flags_internal::FlagOpFn dst_op) const + void Read(void* dst, const flags_internal::FlagOpFn dst_op) const ABSL_LOCKS_EXCLUDED(*DataGuard()); // Attempts to parse supplied `value` std::string. If parsing is successful, then // it replaces `dst` with the new value. - bool TryParse(const CommandLineFlag& flag, void** dst, - absl::string_view value, std::string* err) const + bool TryParse(void** dst, absl::string_view value, std::string* err) const ABSL_EXCLUSIVE_LOCKS_REQUIRED(*DataGuard()); template <typename T> bool AtomicGet(T* v) const { @@ -189,12 +194,11 @@ class FlagImpl { } // Mutating access methods - void Write(const CommandLineFlag& flag, const void* src, - const flags_internal::FlagOpFn src_op) + void Write(const void* src, const flags_internal::FlagOpFn src_op) + ABSL_LOCKS_EXCLUDED(*DataGuard()); + bool SetFromString(absl::string_view value, FlagSettingMode set_mode, + ValueSource source, std::string* err) ABSL_LOCKS_EXCLUDED(*DataGuard()); - bool SetFromString(const CommandLineFlag& flag, absl::string_view value, - FlagSettingMode set_mode, ValueSource source, - std::string* err) ABSL_LOCKS_EXCLUDED(*DataGuard()); // If possible, updates copy of the Flag's value that is stored in an // atomic word. void StoreAtomic() ABSL_EXCLUSIVE_LOCKS_REQUIRED(*DataGuard()); @@ -214,12 +218,11 @@ class FlagImpl { return absl::make_unique<flags_internal::FlagState<T>>( flag, std::move(cur_value), modified_, on_command_line_, counter_); } - bool RestoreState(const CommandLineFlag& flag, const void* value, - bool modified, bool on_command_line, int64_t counter) - ABSL_LOCKS_EXCLUDED(*DataGuard()); + bool RestoreState(const void* value, bool modified, bool on_command_line, + int64_t counter) ABSL_LOCKS_EXCLUDED(*DataGuard()); // Value validation interfaces. - void CheckDefaultValueParsingRoundtrip(const CommandLineFlag& flag) const + void CheckDefaultValueParsingRoundtrip() const ABSL_LOCKS_EXCLUDED(*DataGuard()); bool ValidateInputValue(absl::string_view value) const ABSL_LOCKS_EXCLUDED(*DataGuard()); @@ -235,7 +238,10 @@ class FlagImpl { ABSL_EXCLUSIVE_LOCKS_REQUIRED(*DataGuard()); // Immutable Flag's data. - const FlagOpFn op_; // Type-specific handler. + // Constant configuration for a particular flag. + const char* const name_; // Flags name passed to ABSL_FLAG as second arg. + const char* const filename_; // The file name where ABSL_FLAG resides. + const FlagOpFn op_; // Type-specific handler. const FlagMarshallingOpFn marshalling_op_; // Marshalling ops handler. const FlagHelpSrc help_; // Help message literal or function to generate it. // Indicates if help message was supplied as literal or generator func. @@ -286,13 +292,12 @@ class FlagImpl { template <typename T> class Flag final : public flags_internal::CommandLineFlag { public: - constexpr Flag(const char* name, const flags_internal::HelpInitArg help, - const char* filename, + constexpr Flag(const char* name, const char* filename, const flags_internal::FlagMarshallingOpFn marshalling_op, - const flags_internal::FlagDfltGenFunc initial_value_gen) - : flags_internal::CommandLineFlag(name, filename), - impl_(&flags_internal::FlagOps<T>, marshalling_op, initial_value_gen, - help) {} + const flags_internal::HelpInitArg help, + const flags_internal::FlagDfltGenFunc default_value_gen) + : impl_(name, filename, &flags_internal::FlagOps<T>, marshalling_op, help, + default_value_gen) {} T Get() const { // See implementation notes in CommandLineFlag::Get(). @@ -303,19 +308,22 @@ class Flag final : public flags_internal::CommandLineFlag { }; U u; - impl_.Read(*this, &u.value, &flags_internal::FlagOps<T>); + impl_.Read(&u.value, &flags_internal::FlagOps<T>); return std::move(u.value); } bool AtomicGet(T* v) const { return impl_.AtomicGet(v); } - void Set(const T& v) { impl_.Write(*this, &v, &flags_internal::FlagOps<T>); } + void Set(const T& v) { impl_.Write(&v, &flags_internal::FlagOps<T>); } void SetCallback(const flags_internal::FlagCallback mutation_callback) { impl_.SetCallback(mutation_callback); } // CommandLineFlag interface + absl::string_view Name() const override { return impl_.Name(); } + std::string Filename() const override { return impl_.Filename(); } + absl::string_view Typename() const override { return ""; } std::string Help() const override { return impl_.Help(); } bool IsModified() const override { return impl_.IsModified(); } bool IsSpecifiedOnCommandLine() const override { @@ -338,20 +346,19 @@ class Flag final : public flags_internal::CommandLineFlag { // Restores the flag state to the supplied state object. If there is // nothing to restore returns false. Otherwise returns true. bool RestoreState(const flags_internal::FlagState<T>& flag_state) { - return impl_.RestoreState(*this, &flag_state.cur_value_, - flag_state.modified_, flag_state.on_command_line_, - flag_state.counter_); + return impl_.RestoreState(&flag_state.cur_value_, flag_state.modified_, + flag_state.on_command_line_, flag_state.counter_); } bool SetFromString(absl::string_view value, flags_internal::FlagSettingMode set_mode, flags_internal::ValueSource source, std::string* error) override { - return impl_.SetFromString(*this, value, set_mode, source, error); + return impl_.SetFromString(value, set_mode, source, error); } void CheckDefaultValueParsingRoundtrip() const override { - impl_.CheckDefaultValueParsingRoundtrip(*this); + impl_.CheckDefaultValueParsingRoundtrip(); } private: @@ -360,7 +367,7 @@ class Flag final : public flags_internal::CommandLineFlag { void Destroy() override { impl_.Destroy(); } void Read(void* dst) const override { - impl_.Read(*this, dst, &flags_internal::FlagOps<T>); + impl_.Read(dst, &flags_internal::FlagOps<T>); } flags_internal::FlagOpFn TypeId() const override { return &flags_internal::FlagOps<T>; @@ -416,20 +423,6 @@ T* MakeFromDefaultValue(EmptyBraces) { return new T; } -// MakeFromDefaultValueOrEmpty is basically the same as MakeFromDefaultValue. It -// also allows for empty macro parameter (hence no argument), which was somehow -// widely used for ABSL_RETIRED_FLAG(). - -template <typename T> -T* MakeFromDefaultValueOrEmpty(T t) { - return MakeFromDefaultValue(std::move(t)); -} - -template <typename T> -T* MakeFromDefaultValueOrEmpty() { - return MakeFromDefaultValue<T>(EmptyBraces()); -} - } // namespace flags_internal ABSL_NAMESPACE_END } // namespace absl |