546 lines
21 KiB
C++
546 lines
21 KiB
C++
// Protocol Buffers - Google's data interchange format
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// Copyright 2008 Google Inc. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file or at
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// https://developers.google.com/open-source/licenses/bsd
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#ifndef GOOGLE_PROTOBUF_INLINED_STRING_FIELD_H__
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#define GOOGLE_PROTOBUF_INLINED_STRING_FIELD_H__
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#include <string>
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#include <utility>
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#include "absl/log/absl_check.h"
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#include "absl/strings/string_view.h"
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#include "google/protobuf/arenastring.h"
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#include "google/protobuf/explicitly_constructed.h"
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#include "google/protobuf/message_lite.h"
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#include "google/protobuf/port.h"
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// Must be included last.
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#include "google/protobuf/port_def.inc"
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#ifdef SWIG
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#error "You cannot SWIG proto headers"
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#endif
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namespace google {
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namespace protobuf {
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class Arena;
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namespace internal {
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// InlinedStringField wraps a std::string instance and exposes an API similar to
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// ArenaStringPtr's wrapping of a std::string* instance.
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//
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// default_value parameters are taken for consistency with ArenaStringPtr, but
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// are not used for most methods. With inlining, these should be removed from
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// the generated binary.
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//
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// InlinedStringField has a donating mechanism that allows string buffer
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// allocated on arena. A string is donated means both the string container and
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// the data buffer are on arena. The donating mechanism here is similar to the
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// one in ArenaStringPtr with some differences:
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//
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// When an InlinedStringField is constructed, the donating state is true. This
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// is because the string container is directly stored in the message on the
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// arena:
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//
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// Construction: donated=true
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// Arena:
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// +-----------------------+
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// |Message foo: |
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// | +-------------------+ |
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// | |InlinedStringField:| |
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// | | +-----+ | |
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// | | | | | | | |
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// | | +-----+ | |
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// | +-------------------+ |
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// +-----------------------+
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//
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// When lvalue Set is called, the donating state is still true. String data will
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// be allocated on the arena:
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//
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// Lvalue Set: donated=true
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// Arena:
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// +-----------------------+
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// |Message foo: |
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// | +-------------------+ |
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// | |InlinedStringField:| |
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// | | +-----+ | |
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// | | | | | | | |
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// | | +|----+ | |
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// | +--|----------------+ |
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// | V |
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// | +----------------+ |
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// | |'f','o','o',... | |
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// | +----------------+ |
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// +-----------------------+
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//
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// Some operations will undonate a donated string, including: Mutable,
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// SetAllocated, Rvalue Set, and Swap with a non-donated string.
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//
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// For more details of the donating states transitions, go/pd-inlined-string.
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class PROTOBUF_EXPORT InlinedStringField {
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public:
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InlinedStringField() : str_() {}
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InlinedStringField(const InlinedStringField&) = delete;
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InlinedStringField& operator=(const InlinedStringField&) = delete;
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#if defined(__cpp_lib_constexpr_string) && __cpp_lib_constexpr_string >= 201907L
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// No need to do dynamic initialization here.
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constexpr void Init() {}
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// Add the dummy parameter just to make InlinedStringField(nullptr)
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// unambiguous.
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constexpr InlinedStringField(
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const ExplicitlyConstructed<std::string>* /*default_value*/,
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bool /*dummy*/)
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: str_{} {}
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#else
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inline void Init() { ::new (static_cast<void*>(&str_)) std::string(); }
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// Add the dummy parameter just to make InlinedStringField(nullptr)
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// unambiguous.
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constexpr InlinedStringField(
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const ExplicitlyConstructed<std::string>* /*default_value*/,
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bool /*dummy*/)
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: dummy_{} {}
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#endif
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explicit InlinedStringField(const std::string& default_value);
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explicit InlinedStringField(Arena* arena);
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InlinedStringField(Arena* arena, const InlinedStringField& rhs);
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~InlinedStringField() { Destruct(); }
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// Lvalue Set. To save space, we pack the donating states of multiple
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// InlinedStringFields into an uint32_t `donating_states`. The `mask`
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// indicates the position of the bit for this InlinedStringField. `donated` is
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// whether this field is donated.
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//
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// The caller should guarantee that:
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//
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// `donated == ((donating_states & ~mask) != 0)`
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//
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// This method never changes the `donating_states`.
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void Set(absl::string_view value, Arena* arena, bool donated,
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uint32_t* donating_states, uint32_t mask, MessageLite* msg);
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// Rvalue Set. If this field is donated, this method will undonate this field
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// by mutating the `donating_states` according to `mask`.
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void Set(std::string&& value, Arena* arena, bool donated,
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uint32_t* donating_states, uint32_t mask, MessageLite* msg);
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void Set(const char* str, ::google::protobuf::Arena* arena, bool donated,
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uint32_t* donating_states, uint32_t mask, MessageLite* msg);
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void Set(const char* str, size_t size, ::google::protobuf::Arena* arena, bool donated,
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uint32_t* donating_states, uint32_t mask, MessageLite* msg);
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template <typename RefWrappedType>
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void Set(std::reference_wrapper<RefWrappedType> const_string_ref,
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::google::protobuf::Arena* arena, bool donated, uint32_t* donating_states,
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uint32_t mask, MessageLite* msg);
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void SetBytes(absl::string_view value, Arena* arena, bool donated,
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uint32_t* donating_states, uint32_t mask, MessageLite* msg);
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void SetBytes(std::string&& value, Arena* arena, bool donated,
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uint32_t* donating_states, uint32_t mask, MessageLite* msg);
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void SetBytes(const char* str, ::google::protobuf::Arena* arena, bool donated,
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uint32_t* donating_states, uint32_t mask, MessageLite* msg);
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void SetBytes(const void* p, size_t size, ::google::protobuf::Arena* arena,
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bool donated, uint32_t* donating_states, uint32_t mask,
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MessageLite* msg);
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template <typename RefWrappedType>
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void SetBytes(std::reference_wrapper<RefWrappedType> const_string_ref,
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::google::protobuf::Arena* arena, bool donated, uint32_t* donating_states,
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uint32_t mask, MessageLite* msg);
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PROTOBUF_NDEBUG_INLINE void SetNoArena(absl::string_view value);
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PROTOBUF_NDEBUG_INLINE void SetNoArena(std::string&& value);
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// Basic accessors.
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PROTOBUF_NDEBUG_INLINE const std::string& Get() const { return GetNoArena(); }
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PROTOBUF_NDEBUG_INLINE const std::string& GetNoArena() const;
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// Mutable returns a std::string* instance that is heap-allocated. If this
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// field is donated, this method undonates this field by mutating the
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// `donating_states` according to `mask`, and copies the content of the
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// original string to the returning string.
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std::string* Mutable(Arena* arena, bool donated, uint32_t* donating_states,
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uint32_t mask, MessageLite* msg);
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std::string* Mutable(const LazyString& default_value, Arena* arena,
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bool donated, uint32_t* donating_states, uint32_t mask,
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MessageLite* msg);
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// Mutable(nullptr_t) is an overload to explicitly support Mutable(nullptr)
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// calls used by the internal parser logic. This provides API equivalence with
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// ArenaStringPtr, while still protecting against calls with arena pointers.
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std::string* Mutable(std::nullptr_t);
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std::string* MutableNoCopy(std::nullptr_t);
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// Takes a std::string that is heap-allocated, and takes ownership. The
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// std::string's destructor is registered with the arena. Used to implement
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// set_allocated_<field> in generated classes.
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//
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// If this field is donated, this method undonates this field by mutating the
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// `donating_states` according to `mask`.
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void SetAllocated(const std::string* default_value, std::string* value,
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Arena* arena, bool donated, uint32_t* donating_states,
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uint32_t mask, MessageLite* msg);
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void SetAllocatedNoArena(const std::string* default_value,
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std::string* value);
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// Release returns a std::string* instance that is heap-allocated and is not
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// Own()'d by any arena. If the field is not set, this returns nullptr. The
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// caller retains ownership. Clears this field back to nullptr state. Used to
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// implement release_<field>() methods on generated classes.
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PROTOBUF_NODISCARD std::string* Release(Arena* arena, bool donated);
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PROTOBUF_NODISCARD std::string* Release();
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// --------------------------------------------------------
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// Below functions will be removed in subsequent code change
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// --------------------------------------------------------
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#ifdef DEPRECATED_METHODS_TO_BE_DELETED
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PROTOBUF_NODISCARD std::string* Release(const std::string*, Arena* arena,
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bool donated) {
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return Release(arena, donated);
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}
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PROTOBUF_NODISCARD std::string* ReleaseNonDefault(const std::string*,
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Arena* arena) {
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return Release();
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}
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std::string* ReleaseNonDefaultNoArena(const std::string* default_value) {
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return Release();
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}
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void Set(const std::string*, absl::string_view value, Arena* arena,
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bool donated, uint32_t* donating_states, uint32_t mask,
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MessageLite* msg) {
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Set(value, arena, donated, donating_states, mask, msg);
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}
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void Set(const std::string*, std::string&& value, Arena* arena, bool donated,
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uint32_t* donating_states, uint32_t mask, MessageLite* msg) {
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Set(std::move(value), arena, donated, donating_states, mask, msg);
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}
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template <typename FirstParam>
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void Set(FirstParam, const char* str, ::google::protobuf::Arena* arena, bool donated,
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uint32_t* donating_states, uint32_t mask, MessageLite* msg) {
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Set(str, arena, donated, donating_states, mask, msg);
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}
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template <typename FirstParam>
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void Set(FirstParam p1, const char* str, size_t size, ::google::protobuf::Arena* arena,
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bool donated, uint32_t* donating_states, uint32_t mask,
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MessageLite* msg) {
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Set(str, size, arena, donated, donating_states, mask, msg);
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}
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template <typename FirstParam, typename RefWrappedType>
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void Set(FirstParam p1,
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std::reference_wrapper<RefWrappedType> const_string_ref,
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::google::protobuf::Arena* arena, bool donated, uint32_t* donating_states,
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uint32_t mask, MessageLite* msg) {
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Set(const_string_ref, arena, donated, donating_states, mask, msg);
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}
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void SetBytes(const std::string*, absl::string_view value, Arena* arena,
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bool donated, uint32_t* donating_states, uint32_t mask,
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MessageLite* msg) {
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Set(value, arena, donated, donating_states, mask, msg);
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}
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void SetBytes(const std::string*, std::string&& value, Arena* arena,
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bool donated, uint32_t* donating_states, uint32_t mask,
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MessageLite* msg) {
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Set(std::move(value), arena, donated, donating_states, mask, msg);
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}
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template <typename FirstParam>
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void SetBytes(FirstParam p1, const char* str, ::google::protobuf::Arena* arena,
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bool donated, uint32_t* donating_states, uint32_t mask,
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MessageLite* msg) {
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SetBytes(str, arena, donated, donating_states, mask, msg);
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}
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template <typename FirstParam>
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void SetBytes(FirstParam p1, const void* p, size_t size,
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::google::protobuf::Arena* arena, bool donated, uint32_t* donating_states,
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uint32_t mask, MessageLite* msg) {
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SetBytes(p, size, arena, donated, donating_states, mask, msg);
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}
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template <typename FirstParam, typename RefWrappedType>
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void SetBytes(FirstParam p1,
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std::reference_wrapper<RefWrappedType> const_string_ref,
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::google::protobuf::Arena* arena, bool donated, uint32_t* donating_states,
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uint32_t mask, MessageLite* msg) {
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SetBytes(const_string_ref.get(), arena, donated, donating_states, mask,
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msg);
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}
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void SetNoArena(const std::string*, absl::string_view value) {
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SetNoArena(value);
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}
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void SetNoArena(const std::string*, std::string&& value) {
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SetNoArena(std::move(value));
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}
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std::string* Mutable(ArenaStringPtr::EmptyDefault, Arena* arena, bool donated,
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uint32_t* donating_states, uint32_t mask,
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MessageLite* msg) {
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return Mutable(arena, donated, donating_states, mask, msg);
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}
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PROTOBUF_NDEBUG_INLINE std::string* MutableNoArenaNoDefault(
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const std::string* /*default_value*/) {
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return MutableNoCopy(nullptr);
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}
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#endif // DEPRECATED_METHODS_TO_BE_DELETED
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// Arena-safety semantics: this is guarded by the logic in
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// Swap()/UnsafeArenaSwap() at the message level, so this method is
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// 'unsafe' if called directly.
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inline PROTOBUF_NDEBUG_INLINE static void InternalSwap(
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InlinedStringField* lhs, bool lhs_arena_dtor_registered,
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MessageLite* lhs_msg, //
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InlinedStringField* rhs, bool rhs_arena_dtor_registered,
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MessageLite* rhs_msg, Arena* arena);
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// Frees storage (if not on an arena).
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PROTOBUF_NDEBUG_INLINE void Destroy(const std::string* default_value,
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Arena* arena) {
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if (arena == nullptr) {
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DestroyNoArena(default_value);
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}
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}
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PROTOBUF_NDEBUG_INLINE void DestroyNoArena(const std::string* default_value);
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// Clears content, but keeps allocated std::string, to avoid the overhead of
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// heap operations. After this returns, the content (as seen by the user) will
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// always be the empty std::string.
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PROTOBUF_NDEBUG_INLINE void ClearToEmpty() { ClearNonDefaultToEmpty(); }
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PROTOBUF_NDEBUG_INLINE void ClearNonDefaultToEmpty() {
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get_mutable()->clear();
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}
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// Clears content, but keeps allocated std::string if arena != nullptr, to
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// avoid the overhead of heap operations. After this returns, the content (as
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// seen by the user) will always be equal to |default_value|.
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void ClearToDefault(const LazyString& default_value, Arena* arena,
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bool donated);
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// Generated code / reflection only! Returns a mutable pointer to the string.
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PROTOBUF_NDEBUG_INLINE std::string* UnsafeMutablePointer();
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// InlinedStringField doesn't have things like the `default_value` pointer in
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// ArenaStringPtr.
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static constexpr bool IsDefault() { return false; }
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static constexpr bool IsDefault(const std::string*) { return false; }
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private:
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// ScopedCheckInvariants checks all string in-variants at destruction.
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class ScopedCheckInvariants;
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void Destruct() { get_mutable()->~basic_string(); }
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PROTOBUF_NDEBUG_INLINE std::string* get_mutable();
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PROTOBUF_NDEBUG_INLINE const std::string* get_const() const;
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union {
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std::string str_;
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char dummy_;
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};
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std::string* MutableSlow(::google::protobuf::Arena* arena, bool donated,
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uint32_t* donating_states, uint32_t mask,
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MessageLite* msg);
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// When constructed in an Arena, we want our destructor to be skipped.
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friend class ::google::protobuf::Arena;
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typedef void InternalArenaConstructable_;
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typedef void DestructorSkippable_;
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};
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inline std::string* InlinedStringField::get_mutable() { return &str_; }
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inline const std::string* InlinedStringField::get_const() const {
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return &str_;
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}
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inline InlinedStringField::InlinedStringField(
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const std::string& default_value) {
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new (get_mutable()) std::string(default_value);
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}
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#ifdef GOOGLE_PROTOBUF_INTERNAL_DONATE_STEAL_INLINE
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constexpr uint32_t InitDonatingStates() { return ~0u; }
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inline void InternalRegisterArenaDtor(Arena*, void*, void (*)(void*)) {}
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#else // !GOOGLE_PROTOBUF_INTERNAL_DONATE_STEAL_INLINE
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constexpr uint32_t InitDonatingStates() { return 0u; }
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inline void InternalRegisterArenaDtor(Arena* arena, void* object,
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void (*destruct)(void*)) {
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if (arena != nullptr) {
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arena->OwnCustomDestructor(object, destruct);
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}
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}
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#endif // GOOGLE_PROTOBUF_INTERNAL_DONATE_STEAL_INLINE
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inline InlinedStringField::InlinedStringField(Arena* /*arena*/) : str_() {}
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inline InlinedStringField::InlinedStringField(Arena* arena,
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const InlinedStringField& rhs) {
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const std::string& src = *rhs.get_const();
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::new (static_cast<void*>(&str_)) std::string(src);
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}
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inline const std::string& InlinedStringField::GetNoArena() const {
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return *get_const();
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}
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inline void InlinedStringField::SetAllocatedNoArena(
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const std::string* /*default_value*/, std::string* value) {
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if (value == nullptr) {
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// Currently, inlined string field can't have non empty default.
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get_mutable()->clear();
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} else {
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get_mutable()->assign(std::move(*value));
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delete value;
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}
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}
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inline void InlinedStringField::DestroyNoArena(const std::string*) {
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// This is invoked from the generated message's ArenaDtor, which is used to
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// clean up objects not allocated on the Arena.
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this->~InlinedStringField();
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}
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inline void InlinedStringField::SetNoArena(absl::string_view value) {
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get_mutable()->assign(value.data(), value.length());
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}
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inline void InlinedStringField::SetNoArena(std::string&& value) {
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get_mutable()->assign(std::move(value));
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}
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inline PROTOBUF_NDEBUG_INLINE void InlinedStringField::InternalSwap(
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InlinedStringField* lhs, bool lhs_arena_dtor_registered,
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MessageLite* lhs_msg, //
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InlinedStringField* rhs, bool rhs_arena_dtor_registered,
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MessageLite* rhs_msg, Arena* arena) {
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#ifdef GOOGLE_PROTOBUF_INTERNAL_DONATE_STEAL_INLINE
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lhs->get_mutable()->swap(*rhs->get_mutable());
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if (!lhs_arena_dtor_registered && rhs_arena_dtor_registered) {
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lhs_msg->OnDemandRegisterArenaDtor(arena);
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} else if (lhs_arena_dtor_registered && !rhs_arena_dtor_registered) {
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rhs_msg->OnDemandRegisterArenaDtor(arena);
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}
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#else
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(void)arena;
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(void)lhs_arena_dtor_registered;
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(void)rhs_arena_dtor_registered;
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(void)lhs_msg;
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(void)rhs_msg;
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lhs->get_mutable()->swap(*rhs->get_mutable());
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#endif
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}
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inline void InlinedStringField::Set(absl::string_view value, Arena* arena,
|
|
bool donated, uint32_t* /*donating_states*/,
|
|
uint32_t /*mask*/, MessageLite* /*msg*/) {
|
|
(void)arena;
|
|
(void)donated;
|
|
SetNoArena(value);
|
|
}
|
|
|
|
inline void InlinedStringField::Set(const char* str, ::google::protobuf::Arena* arena,
|
|
bool donated, uint32_t* donating_states,
|
|
uint32_t mask, MessageLite* msg) {
|
|
Set(absl::string_view(str), arena, donated, donating_states, mask, msg);
|
|
}
|
|
|
|
inline void InlinedStringField::Set(const char* str, size_t size,
|
|
::google::protobuf::Arena* arena, bool donated,
|
|
uint32_t* donating_states, uint32_t mask,
|
|
MessageLite* msg) {
|
|
Set(absl::string_view{str, size}, arena, donated, donating_states, mask, msg);
|
|
}
|
|
|
|
inline void InlinedStringField::SetBytes(absl::string_view value, Arena* arena,
|
|
bool donated,
|
|
uint32_t* donating_states,
|
|
uint32_t mask, MessageLite* msg) {
|
|
Set(value, arena, donated, donating_states, mask, msg);
|
|
}
|
|
|
|
inline void InlinedStringField::SetBytes(std::string&& value, Arena* arena,
|
|
bool donated,
|
|
uint32_t* donating_states,
|
|
uint32_t mask, MessageLite* msg) {
|
|
Set(std::move(value), arena, donated, donating_states, mask, msg);
|
|
}
|
|
|
|
inline void InlinedStringField::SetBytes(const char* str,
|
|
::google::protobuf::Arena* arena, bool donated,
|
|
uint32_t* donating_states,
|
|
uint32_t mask, MessageLite* msg) {
|
|
Set(str, arena, donated, donating_states, mask, msg);
|
|
}
|
|
|
|
inline void InlinedStringField::SetBytes(const void* p, size_t size,
|
|
::google::protobuf::Arena* arena, bool donated,
|
|
uint32_t* donating_states,
|
|
uint32_t mask, MessageLite* msg) {
|
|
Set(static_cast<const char*>(p), size, arena, donated, donating_states, mask,
|
|
msg);
|
|
}
|
|
|
|
template <typename RefWrappedType>
|
|
inline void InlinedStringField::Set(
|
|
std::reference_wrapper<RefWrappedType> const_string_ref,
|
|
::google::protobuf::Arena* arena, bool donated, uint32_t* donating_states,
|
|
uint32_t mask, MessageLite* msg) {
|
|
Set(const_string_ref.get(), arena, donated, donating_states, mask, msg);
|
|
}
|
|
|
|
template <typename RefWrappedType>
|
|
inline void InlinedStringField::SetBytes(
|
|
std::reference_wrapper<RefWrappedType> const_string_ref,
|
|
::google::protobuf::Arena* arena, bool donated, uint32_t* donating_states,
|
|
uint32_t mask, MessageLite* msg) {
|
|
Set(const_string_ref.get(), arena, donated, donating_states, mask, msg);
|
|
}
|
|
|
|
inline std::string* InlinedStringField::UnsafeMutablePointer() {
|
|
return get_mutable();
|
|
}
|
|
|
|
inline std::string* InlinedStringField::Mutable(std::nullptr_t) {
|
|
return get_mutable();
|
|
}
|
|
|
|
inline std::string* InlinedStringField::MutableNoCopy(std::nullptr_t) {
|
|
return get_mutable();
|
|
}
|
|
|
|
} // namespace internal
|
|
} // namespace protobuf
|
|
} // namespace google
|
|
|
|
#include "google/protobuf/port_undef.inc"
|
|
|
|
#endif // GOOGLE_PROTOBUF_INLINED_STRING_FIELD_H__
|