diff options
Diffstat (limited to 'absl/strings')
-rw-r--r-- | absl/strings/internal/str_split_internal.h | 51 |
1 files changed, 18 insertions, 33 deletions
diff --git a/absl/strings/internal/str_split_internal.h b/absl/strings/internal/str_split_internal.h index 76924771..49ec5392 100644 --- a/absl/strings/internal/str_split_internal.h +++ b/absl/strings/internal/str_split_internal.h @@ -66,56 +66,41 @@ class ConvertibleToStringView { // Matches rvalue strings and moves their data to a member. ConvertibleToStringView(std::string&& s) // NOLINT(runtime/explicit) - : copy_(std::move(s)), value_(copy_), self_referential_(true) {} + : copy_(std::move(s)), value_(copy_) {} ConvertibleToStringView(const ConvertibleToStringView& other) - : value_(other.value_), self_referential_(other.self_referential_) { - if (other.self_referential_) { - new (©_) std::string(other.copy_); - value_ = copy_; - } - } + : copy_(other.copy_), + value_(other.IsSelfReferential() ? copy_ : other.value_) {} - ConvertibleToStringView(ConvertibleToStringView&& other) - : value_(other.value_), self_referential_(other.self_referential_) { - if (other.self_referential_) { - new (©_) std::string(std::move(other.copy_)); - value_ = copy_; - } + ConvertibleToStringView(ConvertibleToStringView&& other) { + StealMembers(std::move(other)); } ConvertibleToStringView& operator=(ConvertibleToStringView other) { - this->~ConvertibleToStringView(); - new (this) ConvertibleToStringView(std::move(other)); + StealMembers(std::move(other)); return *this; } absl::string_view value() const { return value_; } - ~ConvertibleToStringView() { MaybeReleaseCopy(); } - private: - void MaybeReleaseCopy() { - if (self_referential_) { - // An explicit destructor call cannot be a qualified name such as - // std::string. The "using" declaration works around this - // issue by creating an unqualified name for the destructor. - using string_type = std::string; - copy_.~string_type(); + // Returns true if ctsp's value refers to its internal copy_ member. + bool IsSelfReferential() const { return value_.data() == copy_.data(); } + + void StealMembers(ConvertibleToStringView&& other) { + if (other.IsSelfReferential()) { + copy_ = std::move(other.copy_); + value_ = copy_; + other.value_ = other.copy_; + } else { + value_ = other.value_; } } - struct Unused { // MSVC disallows unions with only 1 member. - }; + // Holds the data moved from temporary std::string arguments. Declared first // so that 'value' can refer to 'copy_'. - union { - std::string copy_; - Unused unused_; - }; - + std::string copy_; absl::string_view value_; - // true if value_ refers to the internal copy_ member. - bool self_referential_ = false; }; // An iterator that enumerates the parts of a string from a Splitter. The text |