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-rw-r--r--absl/strings/internal/str_split_internal.h51
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 (&copy_) 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 (&copy_) 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